Wednesday, 27 April 2022

WHO BROKE “THE SCIENCE” AND WHY, Steve Koonin, Chapter 10, of “Unsettled”, 2021

Extract from Steve Koonin's climate science book “Unsettled”. My personal view is: The Science is almost settled on the changing Sun and Sun-Earth relationship as the cause of almost all climate change; with the greenhouse gas effect being, essentially, fake science.


WHO BROKE “THE SCIENCE” AND WHY, Steve Koonin

Chapter 10, of “Unsettled”, by Steve Koonin, 2021.

If crucial parts of the science really are unsettled, as we’ve seen over the past chapters, why is the narrative of The Science so different? Can it really be that the multiplicity of stakeholders in climate matters—scientists, scientific institutions, activists and NGOs, the media, politicians—are all contributing to misinformation in the service of persuasion? And why has The Science gained such prominence over science?

Observing this scene over the years, I’ve given a lot of thought to how the communication of climate science works. I’m no expert on human behavior, but I have seen this process up close, and my direct experiences, along with some universal truths about humans, suggest not some secret cabal, but rather a self-reinforcing alignment of perspectives and interests. Let’s look at the most important players in turn.

THE MEDIA

When I moved to the UK in 2004, I naturally began reading the British newspapers. I was struck by how much more international coverage there was than in the US, no doubt because the smaller UK necessarily has more foreign interactions, as well as ties to the rest of Europe and historical relationships with Commonwealth countries once part of the British Empire. And of course, soccer—that is, football—got many more column inches. But what surprised me most wasn’t only a matter of content, but tone. The British papers were often overtly partisan, not just in their editorials, but also in their reporting. Although I had read widely among US national newspapers, including the New York Times, the Wall Street Journal, and the Washington Post, it was a revelation to see the stark differences in what was covered, and how it was covered, among the UK’s Guardian, the (London) Times, the Telegraph, and the Financial Times.

In the years since, US media outlets have developed more explicit and more differentiated points of view themselves, and those have likewise seeped from their editorial pieces into their reporting. Most notably, as the age of the internet advanced, headlines became more provocative to encourage clicks—even when the article itself didn’t support the provocation. Today, the shift toward the alarming—and shareable—has traveled well beyond the headlines. That’s especially true in climate and energy matters.

Whatever its noble intentions, news is ultimately a business, one that in this digital era increasingly depends upon eyeballs in the form of clicks and shares. Reporting on the scientific reality that there’s been hardly any long-term change in extreme weather doesn’t fit the ethos of If it bleeds it leads. On the other hand, there is always an extreme weather story somewhere in the world to support a sensational headline.

Changes in staffing also contribute to the media miscommunication of the science. Many newsrooms are shrinking, and serious in-depth reporting is becoming less common. Many people reporting on climate don’t have a background in science. This is a particular problem because, as we’ve seen, the assessment reports themselves can be misleading, especially to non-experts. Science stories are almost always stories of nuance; they require time and research. Unfortunately, the pace of the news cycle has only become more frantic, and reporters and editors have less time than ever. The diversity and ubiquity of modern media have increased the demand for fresh “content” and the competition to be the first to post a story. And as with scientists, a professional code that calls for lack of bias doesn’t mean none creeps in.

As I interact with journalists, I realize that, for some, “climate change” has become a cause and a mission—to save the world from destruction by humans—so that packing alarm into whatever the story is becomes the “right” thing to do, even an obligation. This has been compounded by the rise of a new job category: “climate reporters.” Their mission is largely predetermined; if they don’t have a narrative of doom to report, they won’t get into the paper (whether digital or print) or on the air.

Here’s an example. A recent front-page story in the Washington Post reported that the Biden administration’s climate policy would aim “to rapidly shrink the nation’s carbon emissions,” explaining that “a warming planet has made the issue increasingly hard to ignore, as the litany of climate-related catastrophes has grown with each passing year.1

Of course, as you have already read, the data does not at all support that “climate-related catastrophes” are growing “with each passing year.” There’s much factual reporting in the full-page story that follows about plans for the new administration. But without those initial alarm bells, would the story have made it to the front page?

In short, the general lack of knowledge of what the science actually says, the drama of extreme weather events and their heart-rending impact on people, and pressures within the industry all work against balanced coverage in the popular media.

POLITICIANS

Politicians win elections by arousing passion and commitment from voters—by motivating and persuading. This is not new. H. L. Mencken’s 1918 book In Defense of Women noted:

The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, most of them imaginary.2

The threat of climate catastrophe—whether storms, droughts, rising seas, failed crops, or economic collapse—resonates with everyone. And this threat can be portrayed as both urgent (by invoking a recent deadly weather event, for instance) and yet distant enough so that a politician’s dire predictions will be tested only decades after they’ve left office. Unfortunately, while climate science and associated energy issues are complicated, complexity and nuance don’t lend themselves at all well to political messaging. So the science is jettisoned in favor of The Science, and “simplified” for use in the political arena, which allows the required actions to be portrayed simply as well—just eliminate fossil fuels to save the planet.

Of course, this isn’t a climate-specific problem, and the electorate— which abhors a gray area—bears part of the blame. It’s hard to rally the base with uncertainty. There would surely be less support for, say, promoting renewable energy sources if they were more realistically portrayed as a possible way to mitigate a possible future problem instead of an essential solution to an imminent crisis. And uncertainty can be a political weapon. Politicians on the right who deny even the basics that science has settled— that human influences have played a role in warming the globe—are not above exploiting climate science uncertainties, offering them as “proof” that the climate isn’t changing after all.

Politicians on the left find it inconvenient to discuss scientific uncertainties or the magnitude of the challenge in reducing human influences. Instead, they declare the science settled and label anyone who questions that conclusion “a denier,” lumping conscientious scientists advocating for less persuasion and more research in with those openly hostile to science itself.

Some politicians have gone far beyond name-calling, brazenly attempting to undermine the scientific process. Two billionaire politicians, Michael Bloomberg and Tom Steyer, whose goal was “making the climate threat feel real, immediate, and potentially devastating to the business world,” conspired with some scientists and others to produce a series of reports mischaracterizing the extreme emissions scenario RCP8.5 as “business as usual” (that is, a world without further efforts to rein in emissions).3, 4 The reports were accompanied by a sophisticated campaign to infuse that notion into scientific conferences and journals.5 Those who seek to corrupt the scientific process in that way are playing the same game as the anti- science crowd they loudly decry. Fortunately, the deception is now being called out in leading scientific journals.6,7

Finally, it is standard practice to suggest that many of the politicians on the right who promulgate the idea of a “climate change hoax” are influenced by ties to industries negatively affected by restrictive environmental regulation. Alas, as the alternative energy industry grows, there is financial incentive for politicians to hype climate catastrophe as well. Science should not be partisan, but climate science’s intersection with energy policy and politics all but guaranteed that it would become so.

SCIENTIFIC INSTITUTIONS

Trust in scientific institutions underpins our ability—and the ability of the media and politicians as well—to trust what is presented to us as The Science. Yet when it comes to climate, those institutions frequently seem more concerned with making the science fit a narrative than with ensuring the narrative fits the science. We’ve already seen that the institutions that prepare the official assessment reports have a communication problem, often summarizing or describing the data in ways that are actively misleading. In the next chapter, we’ll delve a bit further into how this happens; I won’t belabor the point here.

Other scientific institutions, or their leaders, have also been overwilling to persuade rather than inform. The National Academies of Sciences, Engineering, and Medicine (NASEM) is a private, nonprofit institution chartered by the US Congress in 1863 to advise the nation. To quote from their website:

The National Academies of Sciences, Engineering, and Medicine are the nation’s pre-eminent source of high-quality, objective advice on science, engineering, and health matters.8

The Academies provide that advice largely through written reports sponsored by federal agencies. Some two hundred reports are published each year, dealing with a great range of topics in science, engineering, medicine, and the societal issues associated with them.9

Academies reports undergo an extensive authoring and review process. I know that process well, having led two Academies studies and reviewed the reports of several others, along with for six years overseeing all the Academies’ report activities in Engineering and the Physical Sciences (including several in Energy, but none in Climate Science). This process does indeed result in reports that are almost always objective and of the highest quality. Unfortunately, as we’ve seen, their reviews of the National Climate Assessments (they don’t write the assessments themselves) in 2014 and 2017/18 didn’t quite meet that standard.

On June 28, 2019, the presidents of the National Academies of Science, Engineering, and Medicine issued a statement affirming “the Scientific Evidence of Climate Change.” The sole paragraph dealing with the science itself read:

Scientists have known for some time, from multiple lines of evidence, that humans are changing Earth’s climate, primarily through greenhouse gas emissions. The evidence on the impacts of climate change is also clear and growing. The atmosphere and the Earth’s oceans are warming, the magnitude and frequency of certain extreme events are increasing, and sea level is rising along our coasts.10

Even given the need for brevity, this is a misleadingly incomplete and imprecise accounting of the state of climate science. It conflates human-caused warming with the changing climate in general, erroneously invokes “certain extreme events” while omitting the fact that most types (including those that pop most readily to mind when one reads the phrase “extreme events,” like hurricanes) show no significant trend at all. And it states that “sea level is rising” in a way that not only suggests that this, too, is solely attributable to human-caused warming, but elides the fact that the rise is nothing new.

I’m quite sure that this personal statement issued by the presidents in a news release was not reviewed by the usual Academies procedures; if it had been, its deficiencies would have been corrected. The statement therefore carries the weight of the Academies’ name without being subject to its customary rigor. Ironically, the statement goes on to say the Academies “need to more clearly communicate what we know.” Which in this case they didn’t.

When communication of climate science is corrupted like this, it undermines the confidence people have in what the scientific establishment says about other crucial societal issues (COVID-19 being the outstanding recent example). As Philip Handler, a prior president of the National Academy of Sciences, wrote in the 1980 editorial I mentioned in the Introduction:

It is time to return to the ethics and norms of science so that the political process may go on with greater confidence. The public may wonder why we do not already know that which appears vital to decision—but science will retain its place in public esteem only if we steadfastly admit the magnitude of our uncertainties and then assert the need for further research. And we shall lose that place if we dissemble or if we argue as if all necessary information and understanding were in hand. Scientists best serve public policy by living within the ethics of science, not those of politics.11

SCIENTISTS

This book’s introduction described Stephen Schneider’s false choice between being effective and being honest. But there are other factors that encourage climate researchers’ monolithic portrayal of the science as settled, however vigorous their internal debates might be. Feynman closes his Cargo Cult speech by wishing the Caltech graduates

the good luck to be somewhere where you are free to maintain the kind of integrity I have described, and where you do not feel forced by a need to maintain your position in the organization, or financial support, or so on, to lose your integrity.

I know from experience that such institutional pressures are real; whether you’re working for the government, a corporation, or an NGO, there is a message to be adhered to. For academics, there is pressure to generate press and to secure funding through grants. There’s also the matter of promotion and tenure. And there is peer pressure: more than a few climate contrarians have suffered public opprobrium and diminished career prospects for publicizing data that doesn’t support the “broken climate” meme.

Carl Wunsch, a prominent oceanographer from MIT who has long urged scientists to be realistic in their portrayal of the science,12 has written about the pressures on climate scientists to produce splashy results:

The central problem of climate science is to ask what you do and say when your data are, by almost any standard, inadequate? If I spend three years analyzing my data, and the only defensible inference is that “the data are inadequate to answer the question,” how do you publish? How do you get your grant renewed? A common answer is to distort the calculation of the uncertainty, or ignore it all together, and proclaim an exciting story that the New York Times will pick up.
A lot of this is somewhat like what goes on in the medical business: Small, poorly controlled studies are used to proclaim the efficacy of some new drug or treatment. How many such stories have been withdrawn years later when enough adequate data became available?13

Scientists not involved with climate research are also to be faulted. While they’re in a unique position to evaluate climate science’s claims, they’re prone to a phenomenon I call “climate simple.” The phrase “blood simple,” first used by Dashiell Hammett in his 1929 novel Red Harvest, describes the deranged mindset of people after a prolonged immersion in violent situations; “climate simple” is an analogous ailment, in which otherwise rigorous and analytical scientists abandon their critical faculties when discussing climate and energy issues. For example, the diagnosis was climate simple when one of my senior scientific colleagues asked me to stop “the distraction” of pointing out inconvenient sections of an IPCC report. This was an eyes-shut-fingers-in-the-ears position I’ve never heard in any other scientific discussion.

What causes climate simple? Perhaps it is a lack of knowledge of the subject, or fear of speaking out, particularly against scientific peers. Or perhaps it is simple conviction born more of faith in the proclaimed consensus than of the evidence presented.

Leo Tolstoy’s 1894 philosophical treatise The Kingdom of God Is Within You contains the following thought:

The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.14

Whatever its cause, climate simple is a problem. Major changes in society are being advocated and trillions will be spent, all based on the findings of climate science. That science should be open to intense scrutiny and questioning, and scientists should approach it with their usual critical objectivity. And they shouldn’t have to be afraid when they do.

ACTIVISTS AND NONGOVERNMENTAL ORGANIZATIONS (NGOS)

My inbox fills with fundraising appeals from such organizations as 350.org, the Union of Concerned Scientists, and the Natural Resources Defense Council. If you believe there is a “climate emergency,” have built an organization on that premise, and rely upon your donors’ continuing commitment to the cause, projecting urgency is crucial. Hence statements like “The climate crisis is immense—we must be daring and courageous in response” (from the 350.org website15) or “Climate change is one of the most devastating problems that humanity has ever faced—and the clock is running out” (from the UCS website16). It’s hardly in your best interest to tell your donors that the climate shows no sign of being broken or that projections of future disasters rely on models of dubious validity. The media tend to accord NGOs an authoritative stance. But these are also interest groups, with their own climate and energy agendas. And they are powerful political actors, who mobilize supporters, raise money, run campaigns, and wield political power. For many, the “climate crisis” is their entire raison d’etre. They also have to worry about being outflanked by more militant groups.

I have no problem with activism, and the efforts of NGOs have made the world better in countless ways. But distorting science to further a cause is inexcusable, particularly with the complicity of those scientists who serve on their advisory boards.

THE PUBLIC

Fear of extreme weather events is understandable, and concerns about changes in climate are as old as humanity. Short-term weather events (storms, floods, droughts) have stressed and challenged societies, while changes extending over decades induced mass migrations or even destroyed entire civilizations. For example, repeated crop failures devastated communities in the southwest United States during the twenty-five-year-long Great Drought about 750 years ago.17

The notion that our behavior might be causing such calamities is also as old as humanity—as is the hope that we might avoid the worst of climate disasters by changing our behavior. Leviticus 26:3–4 promises regular rain (very important in the Middle East) and its ensuing benefits in return for doing the right thing:

If ye walk in my statutes, and keep my commandments, and do them; Then I will give you rain in due season, and the land shall yield her increase, and the trees of the field shall yield their fruit.

We like to think public attitudes toward climate today are more discerning, but they still mostly involve unquestioning acceptance of wisdom handed down from on high. As around the world, most citizens in America are not scientists, and the educational system does not deliver much in the way of scientific literacy to the wider public. Most people do not have the ability to examine the science themselves, and they have neither time nor the inclination to do so. Many increasingly get their information from social media, where it is far too easy to promote misinformation or disinformation. And in my experience, people tend to believe—and trust—their chosen media in areas outside their expertise.

Michael Crichton, the bestselling author of The Andromeda Strain and Jurassic Park, lived near Caltech and was a prominent member of Pasadena’s extended intellectual community until his death in 2008. Crichton, who was a physician before he became a writer, was an outspoken advocate for scientific integrity, and he looked askance at the public presentation of climate science (his 2004 novel State of Fear deals with that subject). Crichton’s conversations with Caltech professor Murray Gell-Mann (the Nobel prize–winning physicist who was one of the first researchers to hypothesize quarks) led him to describe the “Gell-Mann Amnesia” effect:

You open the newspaper to an article on some subject you know well. In Murray’s case, physics. In mine, show business …
In any case, you read with exasperation or amusement the multiple errors in a story, and then turn the page to national or international affairs, and read as if the rest of the newspaper was somehow more accurate about Palestine than the baloney you just read. You turn the page, and forget what you know.18

It certainly doesn’t help that, at this point, even attempting a discussion of The Science is to enter a political minefield. When I tell people some of the things the assessment reports really say about climate, many immediately ask whether I was a Trump supporter. My reply is that I was not, and that, as a scientist, I have always supported truth.

As a scientist, I’m disappointed that so many individuals and organizations in the scientific community are demonstrably misrepresenting the science in an effort to persuade rather than inform. But you also should be concerned as a citizen. In a democracy, voters will ultimately decide how society responds to a changing climate. Major decisions made without full knowledge of what the science says (and doesn’t say) or, even worse, on the basis of misinformation, are much less likely to lead to positive outcomes. COVID-19 offered a sobering illustration of this, and it’s as true for climate and energy as it is for pandemics.

Notes

  1. Brady, Dennis and Juliet Eilperin. “In Confronting Climate Change, Biden Won’t Have a Day to Waste.” Washington Post. December 22, 2020. https://www.washingtonpost.com/politics/2020/12/22/biden-climate-change/.
  2. Mencken, H. L. In Defense of Women. Project Gutenberg. Last updated February 6, 2013. https://www.gutenberg.org/files/1270/1270-h/1270-h.htm.
  3. Helm, Burt. “Climate Change’s Bottom Line.” New York Times, January 31, 2015. https://www.nytimes.com/2015/02/01/business/energy-environment/climate-changes-bottom-line.html.
  4. The Risky Business Project. “Risky Business: The Economic Risks of Climate Change in the United States.” June 2014. http://riskybusiness.org/site/assets/uploads/2015/09/RiskyBusiness_Report_WEB_09_08_14.pdf.
  5. Pilke, Roger. “How Billionaires Tom Steyer and Michael Bloomberg Corrupted Climate Science.” Forbes, January 2, 2020. https://www.forbes.com/sites/rogerpielke/2020/01/02/how-billionaires-tom-steyer-and-michael-bloomberg-corrupted-climate-science.
  6. Hausfather, Zeke, and Glen P. Peters. “Emissions—the ‘business as usual’ story is misleading.” Nature, January 29, 2020. https://www.nature.com/articles/d41586-020-00177-3.
  7. Burgess, Matthew G., et al. Environmental Research Letters 16 (2020). https://doi.org/10.1088/1748-9326/abcdd2.
  8. “About Us: Who We Are.” The National Academies of Sciences, Engineering, and Medicine. Accessed December 1, 2020 https://www.nationalacademies.org/about.
  9. The National Academies of Sciences, Engineering, and Medicine. “Climate Change Publications.” The National Academies Press. Accessed December 1, 2020. https://www.nap.edu/.
  10. McNutt, Marcia, C. D. Mote Jr., Victor J. Dzau. “National Academies Presidents Affirm the Scientific Evidence of Climate Change.” The National Academies of Sciences, Engineering, and Medicine, June 18, 2019. http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=06182019.
  11. Handler, Philip. “Public Doubts About Science.” Science, June 6, 1980. https://science.sciencemag.org/content/208/4448/1093.
  12. Wunsch, Carl. “Swindled: Carl Wunsch Responds.” RealClimate, March 12, 2007. http://www.realclimate.org/index.php/archives/2007/03/swindled-carl-wunsch-responds/comment-page-3/.
  13. Revkin, Andrew C. “A Closer Look at Turbulent Oceans and Greenhouse Heating.” New York Times, August 26, 2014. https://dotearth.blogs.nytimes.com/2014/08/26/a-closer-look-at-turbulent-oceans-and-greenhouse-heating/.
  14. Tolstoy, Leo. 1894. The Kingdom of God Is Within You. Project Gutenberg, July 26, 2013. https://www.gutenberg.org/files/43302/43302-h/43302-h.htm.
  15. “About 350.Org.” 350.org. Accessed December 1, 2020. https://350.org/about/.
  16. “Climate Change.” Union of Concerned Scientists. Accessed December 1, 2020. https://www.ucsusa.org/climate.
  17. The Editors of Encyclopaedia Britannica. “Great Drought.” Encyclopædia Britannica, November 26, 2012. https://www.britannica.com/event/Great-Drought#ref=ref112984.
  18. Crichton, Michael. At the International Leadership Forum, La Jolla, CA, April 26, 2002. http://geer.tinho.net/crichton.why.speculate.txt.

Sunday, 17 April 2022

Lacis et al 2010

It seems this is considered something of a 'key study', as it was presented to me as evidence for a greenhouse gas effect; AKA man-made climate change and anthropogenic global warming, AGW.

The difference between the nominal global mean surface temperature (TS = 288 K) and the global mean effective temperature (TE = 255 K) is a common measure of the terrestrial greenhouse effect (GT = TS – TE = 33 K).

<- This statement in Lacis' paper is a not true. I will call it a straight lie because the reasons why it's not true have been explained to Lacis et al, time and again. Yet they continue to use their priveledge, as scientists or academics to mislead in the academic literature by, essentially publishing speculation. There is no 'terrestrial greenhouse effect' = 33 K.

By 'terrestrial greenhouse effect' they mean two things:

  1. warming of earth's surface by +33K above what it would otherwise be (without the effect)
  2. the cause of this 'warming' being ONLY due to "radiative gases" such as CO2, H2O, ... in earth's atmosphere which are able to absorb and emit infrared radiation due to electron orbital transitions.

This, above quote, is a speculative statement made by Lacis and co. There is no empirical science in their paper to show it. They did no empirical work to arrive at their conclusion. It's speculation. They made it u, or rather, they repeated other people's speculations.

Besides direct solar heating of the ground, there is also indirect longwave (LW) warming arising from the thermal radiation that is emitted by the ground, then absorbed locally within the atmosphere, from which it is re-emitted in both upward and downward directions

<- They don't cite a single source to show any "indirect longwave warming of the 'ground'". Once again they made it up. It is not science. There isn't a single study they refer back to which empirically shows what they claim. BTW: by 'ground' they mean earth's surface. Don't forget that 70% of earth's surface is water. But I'll let them off here; after all they clearly wrote their paper in a hurry for maximum rhetorical effect.

This radiative interaction is the greenhouse effect, which was first discovered by Joseph Fourier in 1824 verified by John Tyndall in 1863 (3), and quantified by Svante Arrhenius in 1896

<- Yet more lies, Joseph Fourier did not 'discover' a greenhouse effect in 1824. Tyndall verifies nothing, Arrhenius quantified nothing. None of these 3 men did any experimental or empirical work to show earth's surface warmed due these so-called greenhouse gases. They just announced it. A bit like the mythical planet X, or the mammal population where COVID-19 was supposedly living before it crossed over to humanity. Pure speculation. It does not matter how many experts and scientists speculate. The speculation of 1 million scientists is not more true than that of one. Speculation is just word salad. It is not 'science'. It becomes science when a hypothesis is testable. When the hypothesis is written in such a way that experiments and tests are implied such that projections of the idea can be compared to the real world when both are subject to the same circumstances.

These studies established long ago that water vapor and CO2 are indeed the principal terrestrial GHGs. Now, further consideration shows that CO2 is the one that controls climate change.

<- Yet another lie. CO2 does not control 'climate change'. No study done even attempts to show that. Lacis does not cite such a study.

CO2 is a well-mixed gas that does not condense or precipitate from the atmosphere. Water vapor and clouds, on the other hand, are highly active components of the climate system that respond rapidly to changes in temperature and air pressure by evaporating, condensing, and precipitating. This identifies water vapor and clouds as the fast feedback processes in the climate system.

<- That last paragraph was almost honest; but has an error and a lie in it. Lacis says:

Water vapor and clouds, ... respond rapidly to changes in temperature and air pressure by evaporating, condensing, and precipitating.
No. Clouds do not evaporate in any meaningful way. Evaporation of liquid water happens at the surface.
This identifies water vapor and clouds as the fast feedback processes in the climate system.

<- Lacis added the word feedback out-of-the-blue. Like a magician, he conjures 'feedback' into his system by just saying it. Not with any science, or experiment. He made it up (again)

We'll pause here because in the next sentence they say "experiment" - which is a scientific term. To be treated seriously. Prior to that everything else in the first side (displayed above) is speculation and modelling layered on top of more speculation & modelling. It is "not even wrong"; because it is not even science.

Note: For the purpose of this refutation

  • Lacis - means Lacis et al - all the authors. We summarize it with Lacis because he's the corresponding author.
  • 'greenhouse effect', GHE, 'greenhouse gas effect', GHGE, both mean the same thing. They are supposed due to these greenhouse gases, GHG, mainly CO2 and H2O. The words are, essentially owned by the climate alarmist political party of which Lacis is a typical example.

Why is earth's surface warmer?

Earth is warmer at the surface, due to our atmosphere, because of adiabatic compression. First described by James Clerk Maxwell in the 19th century in his book "Theory of Heat". To put it simply. Gravity causes the atmosphere closer to the surface to be more dense, than that further away. The ideal gas law: PV = nRT describes this. Rearranging for T
T = P • V / (n • R). R is a constant and n is the number of atoms. T = temperature, P = pressure, V = volume. The more dense the atmosphere, the warmer it is.

Adiabatic compression is found on all planets and moons with a thick atmosphere. Denser atmosphere is warmer. It is densest when closest to the surface. When a mine shaft is dug the Lapse rate continues and temperature continues to increase below the surface level as the air gets denser still. Whether the shaft is covered, or not, it is warmer than the surface. When covered, there can be no backradiation warming it! Just the adiabatic compression. With a greenhouse gas effect, how would be air below a covered mine shaft be irradiated with back-radiation?

Adiabatic compression leads to a Lapse rate in the planet/moon's troposphere.

Many of the warmest places on earth are found below sea level on land in depressions; at locations such as the Dead Sea, Death Valley, Dallot (Afar depression in Ethiopia).

Fourier, Tyndall, and Arrhenius can all be forgiven for not knowing about the atmosphere's of planets and moons. Activist scientists such as Lacis et al cannot be forgiven.

In the diagram above, some of these solar system bodies have next to no greenhouse gas in the atmosphere, others such as Venus are nearly all greenhouse gas. Venus's atmosphere is 96% CO2, and its atmospheric mass is 95 times earth's. Yet it's greenhouse gas effect, if any, doesn't give it a significantly different Lapse Rate to any other planet. Venus is very warm because it has a very thick atmosphere. Even though Venus has a quarter million times more carbon dioxide in its atmosphere than earth, there is no greenhouse gas effect there - just strong adiabatic warming at the surface.

million km from sunatmospheric composition
Neptune447480% hydrogen, 19% helium, trace methane
Uranus287182.5% hydrogen, 15% helium, trace methane, water and ammonia
Titan140095% nitrogen, 5% methane
Saturn140075% hydrogen, 25% helium, trace methane & water vapour
Jupiter 77873% hydrogen, 25% helium, trace: methane, ammonia, hydrogen sulfide
Earth 9378% nitrogen, 21% oxygen, 0.9% argon, ~0.5% water vapour, trace: carbon dioxide
Venus 6896.5% carbon dioxide, 3.5% Nitrogen, trace: sulfur dioxide: 150ppm, Argon 70ppm; Water: 20ppm, Carbon Monoxide: 17ppm

Greenhouse gases are written in salmon/pink
Mars is not shown as the surface atmosphere is below 0.1bar. It should not show a Lapse rate.
Only Titan and Venus have significant 'greenhouse gas'.
Titan is a moon of Saturn. Titan has more greenhouse gas than Saturn. But why is Saturn's Lapse rate more pronounced than Titan's?

Wednesday, 13 April 2022

Climate influence on early modern European grain prices

The paper, by 6 Europeans: Ljungqvist, Thejll, Christiansen, Seim, Hartl & Esper is published in Cliometrica 16, 29–77 (2022). https://doi.org/10.1007/s11698-021-00224-7

Abstract

Grain was the most important food source in early modern Europe (c. 1500–1800), and its price influenced the entire economy. The extent to which climate variability determined grain price variations remains contested, and claims of solar cycle influences on prices are disputed. We thoroughly reassess these questions, within a framework of comprehensive statistical analysis, by employing an unprecedentedly large grain price data set together with state-of-the-art palaeoclimate reconstructions and long meteorological series. A highly significant negative grain price–temperature relationship (i.e. colder = high prices and vice versa) is found across Europe. This association increases at larger spatial and temporal scales and reaches a correlation of −0.41 considering the European grain price average and previous year June–August temperatures at annual resolution, and of −0.63 at decadal timescales. This strong relationship is of episodic rather than periodic (cyclic) nature. Only weak and spatially inconsistent signals of hydroclimate (precipitation and drought), and no meaningful association with solar variations, are detected in the grain prices. The significant and persistent temperature effects on grain prices imply that this now rapidly changing climate element has been a more important factor in European economic history, even in southern Europe, than commonly acknowledged.

No Trick Zone discussion Fig. 9

Monday, 11 April 2022

Reblog: Physicist Howard Hayden’s one-letter disproof of global warming claims

Reblog from OP at mises.org

Physicist Howard Hayden’s one-letter disproof of global warming claims

October 29, 2009 - 12:00 AM [1]

Physicist Howard Hayden, a staunch advocate of sound energy policy, sent me a copy of his letter [2] to the EPA about global warming. The text is also appended below, with permission.

As noted in my post Access to Energy [3], Hayden helped the late, great Petr Beckmann found the dissident physics [4] journal Galilean Electrodynamics [5] (brochures and further Beckmann info here [6]; further dissident physics links [4]). Hayden later began to publish his own pro-energy newsletter, The Energy Advocate [7], following in the footsteps of Beckmann’s own journal Access to Energy [8]I love Hayden’s email sign-off, “People will do anything to save the world … except take a course in science.” Here’s the letter:

***

Howard C. Hayden
785 S. McCoy Drive
Pueblo West, CO 81007

October 27, 2009

The Honorable Lisa P. Jackson, Administrator
Environmental Protection Agency
1200 Pennsylvania Ave., NW Washington, DC 20460

Dear Administrator Jackson:

I write in regard to the Proposed Endangerment and Cause or Contribute Findings for Greenhouse Gases Under Section 202(a) of the Clean Air Act, Proposed Rule, 74 Fed. Reg. 18,886 (Apr. 24, 2009), the so-called “Endangerment Finding.”

It has been often said that the “science is settled” on the issue of CO2 and climate. Let me put this claim to rest with a simple one-letter proof that it is false.

The letter is s, the one that changes model into models. If the science were settled, there would be precisely one model, and it would be in agreement with measurements.

Alternatively, one may ask which one of the twenty-some models settled the science so that all the rest could be discarded along with the research funds that have kept those models alive.

We can take this further. Not a single climate model predicted the current cooling phase. If the science were settled, the model (singular) would have predicted it.

Let me next address the horror story that we are approaching (or have passed) a “tipping point.” Anybody who has worked with amplifiers knows about tipping points. The output “goes to the rail.” Not only that, but it stays there. That’s the official worry coming from the likes of James Hansen (of NASA­GISS) and Al Gore.

But therein lies the proof that we are nowhere near a tipping point. The earth, it seems, has seen times when the CO2 concentration was up to 8,000 ppm, and that did not lead to a tipping point. If it did, we would not be here talking about it. In fact, seen on the long scale, the CO2 concentration in the present cycle of glacials (ca. 200 ppm) and interglacials (ca. 300-400 ppm) is lower than it has been for the last 300 million years.

Global-warming alarmists tell us that the rising CO2 concentration is (A) anthropogenic and (B) leading to global warming.

(A) CO2 concentration has risen and fallen in the past with no help from mankind. The present rise began in the 1700s, long before humans could have made a meaningful contribution. Alarmists have failed to ask, let alone answer, what the CO2 level would be today if we had never burned any fuels. They simply assume that it would be the “pre-industrial” value.

  • The solubility of CO2 in water decreases as water warms, and increases as water cools. The warming of the earth since the Little Ice Age has thus caused the oceans to emit CO2 into the atmosphere.

(B) The first principle of causality is that the cause has to come before the effect. The historical record shows that climate changes precede CO2 changes. How, then, can one conclude that CO2 is responsible for the current warming?

Nobody doubts that CO2 has some greenhouse effect, and nobody doubts that CO2 concentration is increasing. But what would we have to fear if CO2 and temperature actually increased?

  • A warmer world is a better world. Look at weather-related death rates in winter and in summer, and the case is overwhelming that warmer is better.
  • The higher the CO2 levels, the more vibrant is the biosphere, as numerous experiments in greenhouses have shown. But a quick trip to the museum can make that case in spades. Those huge dinosaurs could not exist anywhere on the earth today because the land is not productive enough. CO2 is plant food, pure and simple.
  • CO2 is not pollution by any reasonable definition.
  • A warmer world begets more precipitation.
  • All computer models predict a smaller temperature gradient between the poles and the equator. Necessarily, this would mean fewer and less violent storms.
  • The melting point of ice is 0 ºC in Antarctica, just as it is everywhere else. The highest recorded temperature at the South Pole is -14 ºC, and the lowest is -117 ºC. How, pray, will a putative few degrees of warming melt all the ice and inundate Florida, as is claimed by the warming alarmists?

Consider the change in vocabulary that has occurred. The term global warming has given way to the term climate change, because the former is not supported by the data. The latter term, climate change, admits of all kinds of illogical attributions. If it warms up, that’s climate change. If it cools down, ditto. Any change whatsoever can be said by alarmists to be proof of climate change.

In a way, we have been here before. Lord Kelvin “proved” that the earth could not possibly be as old as the geologists said. He “proved” it using the conservation of energy. What he didn’t know was that nuclear energy, not gravitation, provides the internal heat of the sun and the earth.

Similarly, the global-warming alarmists have “proved” that CO2 causes global warming.

Except when it doesn’t.

To put it fairly but bluntly, the global-warming alarmists have relied on a pathetic version of science in which computer models take precedence over data, and numerical averages of computer outputs are believed to be able to predict the future climate. It would be a travesty if the EPA were to countenance such nonsense.

Best Regards,

Howard C. Hayden
Professor Emeritus of Physics, UConn

Update: Global warming, false science, and one-world government [9]

Wednesday, 30 March 2022

Essential papers / books.

Robinson, T., Catling, D. Common 0.1 bar tropopause in thick atmospheres set by pressure-dependent infrared transparency. Nature Geosci 7, 12–15 (2014). https://doi.org/10.1038/ngeo2020
Shows planets with thick atmospheres have a tropopause at 0.1 bar; because at atmospheric pressures < 0.1 bar, transparency to thermal radiation allows short-wave heating (solar radiation) to dominate, creating a stratosphere. At higher pressures, atmospheres become opaque to thermal radiation, causing temperatures to increase with depth and convection to ensue. A common dependence of infrared opacity on pressure, arising from the shared physics of molecular absorption, sets the 0.1 bar tropopause.

The ratio (γ) of specific heats at constant pressure (cp) and volume (cv ), respectively, (γ = cp/cv ) sets the dry adiabatic lapse rate for the trophospheric adiabat, and is 1.4 for atmospheres dominated by diatomic gases.

Derivation of the entire 33°C greenhouse effect without radiative forcing from greenhouse gases | Reblog

Derivation of the entire 33°C greenhouse effect without radiative forcing from greenhouse gases | Reblog


Sunday, November 23, 2014

Derivation of the entire 33°C greenhouse effect without radiative forcing from greenhouse gases

We will derive the entire 33°C greenhouse effect using the 1st law of thermodynamics and ideal gas law without use of radiative forcing from greenhouse gases, nor the concentrations of greenhouse gases, nor the emission/absorption spectra of greenhouse gases at any point in this derivation, thus demonstrating that the entire 33C greenhouse effect is dependent upon atmospheric mass/pressure/gravity, rather than radiative forcing from greenhouse gases. Secondly, we will show why multiple observations perfectly confirm the mass/gravity/pressure theory of the greenhouse effect, and disprove the radiative forcing theory of the greenhouse effect.

Note, this physical derivation is absolutely not suggesting the ~33C greenhouse effect doesn't exist. On the contrary, the physical derivation and observations demonstrate the 33C greenhouse effect does exist, but is explained by a different mechanism not dependent on radiative forcing from greenhouse gases. Also note, it is impossible for both explanations of the greenhouse effect to be true, since the global temperature would have to increase by an additional 33C (at least) above the present. You cannot have it both ways. We will show how the 
mass/gravity/pressure theory causes the temperature gradient and that the emission spectra of greenhouse gases seen from space are a consequence rather than the cause of that temperature gradient. 

This derivation uses very well-known physical principles and barometric formulae possibly first described by the great physicist Maxwell in 1872, who demonstrated that the atmospheric temperature gradient and greenhouse effect are due to pressure from Earth's gravitational field, not radiative forcing. Maxwell makes no mention of any influence of radiation as the cause of the temperature gradient of the atmosphere, but rather relates temperature at a given height to pressure. He discusses the convective (dominated) equilibrium of the atmosphere in his book Theory of Heat, pp. 330-331:

"...In the convective equilibrium of temperature, the absolute temperature is proportional to the pressure raised to the power (γ-1)/γ, or 0,29..."
Twenty four years later, Arrhenius devised his radiative forcing theory of the greenhouse effect, which unfortunately makes a huge false assumption that convection doesn't dominate over radiative-convective equilibrium in the lower atmosphere, and thus Arrhenius completely ignored the dominant negative-feedback of convection over radiative forcing in his temperature derivations. Johns Hopkins physicist RW Wood completely demolished Arrhennius' theory in 1909, as did other published papers in 1963, 1966, 1973, (and others below), but it still refuses to die given its convenience to climate alarm.

We now know from Robinson & Catling's paper in Nature 2014 (and others) that radiative-convective equilibrium on all planets with thick atmospheres in our solar system (including Earth of course) is dominated by convection/pressure/lapse rate in the troposphere up to where the tropopause begins at pressure = 0.1bar. When P < 0.1 bar, the atmosphere is too thin to sustain convection and radiation from greenhouse gases takes over to cause cooling of the stratosphere and above. 

Since Maxwell's book was published in 1872, many others have confirmed that the greenhouse effect is due to atmospheric mass/pressure/gravity, rather than radiative forcing from greenhouse gases, including Hans JelbringConnolly & ConnollyNikolov & ZellerMario Berberan-Santos et alClaes Johnson and hereVelasco et alGiovanni Vladilo et alHeinz ThiemeJacques HenryStephen WildeAlberto MiatelloGerhard Gerlich and Ralf D. TscheuschnerVerity JonesWilliam C. Gilbert & hereRichard C. TolmanLorenz & McKayPeter Morecombe, Robinson and Catling, and many others, so this concept is not new and preceded the Arrhenius theory. 


Step 1: Derivation of the dry adiabatic lapse rate from the 1st Law of Thermodynamics and ideal gas law:

First, the basic assumption can be adopted that the atmosphere, in hydrostatic terms, is a self-gravitating system in constant hydrostatic equilibrium due to the balance of the two opposing forces of gravity and the atmospheric pressure gradient, according to the equation:

 dP/dz = - ρ × g (1)

where ρ is the density (mass per volume) and g the acceleration due to gravity. This equation, from a mathematical point of view, can be derived by considering the hydrostatic equilibrium function as a system of partial derivatives depending on P and ρ and considering all three spatial dimensions:

 ∂P/∂x = ρ × X, ∂P/∂y = ρ × Y, ∂P/∂z = ρ × Z (2)

As, within a fluid mass in equilibrium, pressure and density does not vary along the horizontal axes (X and Y), the related partial derivatives equal zero. But, in the remaining vertical dimension, the partial derivative is non-zero, with density and pressure varying inversely as a function of fluid height (density and pressure decrease with increasing height relative to the bottom) and, considering gravitational force as a constant connected to the measure of density, thus equation (2) can be derived.

For a precise calculation involving the valid parameters, the 1st Law of Thermodynamics can be used:

 Δ U = Q – W (3)

where U is the total internal energy of the system, Q its heat energy, and W the mechanical work the system is undergoing. Applying this relationship to Earth's atmosphere, yields:

 U = C(p)T + gh (4)

where U is the total energy of atmospheric system in hydrostatic equilibrium and equal to the sum of the thermal energy (kinetic plus dissipative and vibro-rotational), the specific heat C(p) multiplied by the temperature T plus the gravitational potential energy, with gravitational force g at height h of the gas. In this case, because the force of gravity has a negative sign as the system is undergoing work, the potential energy ( -g × h) can be equated to the mechanical work (-W) that the system undergoes in the 1st Law of Thermodynamics.

Based on this equation, the atmosphere's "average" temperature change can be found for any point with the system in equilibrium; for now and for simplicity, weather phenomena and disturbances at specific locations are not considered because, with the system in overall hydrostatic and macroscopic equilibrium, any local internal, microclimatic perturbation by definition triggers a rebalancing reaction. In fact, to calculate the energy change of the system in equilibrium (here U is constant) as a function of temperature and height change, differentiation yields: 

dU = 0 = C(p)dT + gdh,

which becomes: 

dT/dh = -g/C(p), or dT = (-g/C(p))dh.  [Dry adiabatic lapse rate equation]

This is a splendid equation, describing precisely the temperatures’ distribution of a gas (as the air of Earth’s atmosphere) in hydrostatic equilibrium between the 2 forces of the lapse-rate (preventing the collapse of the atmosphere at the Earth’s surface) and gravity (preventing the escape of the atmosphere in the void of space). 

In other words, temperature variation (dT) is a function of altitude variation (dh), whose solution at any point of height (h°) and for any temperature (T°), can be found by integrating as follows:

∫dT = -g/C(p) × ∫dh (5)

and whose solution is:

 T - T° = -g/C(p) × (h - h°)   (6)

where:

T – T° = ∆ T (or dT) = Interval of temperatures
g = Gravitational acceleration constant = 9.8 m/s^2
h – h° = ∆ h (or dh) = Space interval (vertical) in the atmosphere
Cp = heat capacity at constant pressure

Step 2: Determine the height at the center of mass of the atmosphere

We are determining the temperature gradient within the mass of the atmosphere using a linear function of atmospheric mass (the lapse rate), therefore the equilibrium temperature is located at the center of mass. The "effective radiating level" or ERL of planetary atmospheres is located at the approximate center of mass of the atmosphere where the temperature is equal to the equilibrium temperature with the Sun. The equilibrium temperature of Earth with the Sun is commonly assumed to be 255K or -18C as calculated here. As a rough approximation, this height is where the pressure is ~50% of the surface pressure. It is also located at the approximate half-point of the troposphere temperature profile set by the linear adiabatic lapse rate, since to conserve energy in the troposphere, the increase in temperature from the ERL to the surface is offset by the temperature decrease from the ERL to the tropopause.


Fig 1. From Robinson & Catling, Nature, 2014 with added notations in red showing at the center of mass of Earth's atmosphere at ~0.5 bar the temperature is ~255K, which is equal to the equilibrium temperature with the Sun. Robinson & Catling also demonstrated that the height of the tropopause is at 0.1 bar for all the planets in our solar system with thick atmospheres, as also shown by this figure, and that convection dominates over radiative-convective equilibrium in the troposphere to produce the troposphere lapse rates of each of these planets as shown above. R&C also show the lapse rates of each of these planets are remarkably similar despite very large differences in greenhouse gas composition and equilibrium temperatures with the Sun, once again proving pressure, not radiative forcing from greenhouse gases, determines tropospheric temperatures. 

Step 3: Determine the surface temperature

For Earth, surface pressure is 1 bar, so the ERL is located where the pressure ~0.5 bar, which is near the middle of the ~10 km high troposphere at ~5km. The average lapse rate on Earth is 6.5C/km, intermediate between the 10C/km dry adiabatic lapse rate and the 5C/km wet adiabatic lapse rate, since the atmosphere on average is intermediate between dry and saturated with water vapor. 

Plugging the average 6.5C/km lapse rate and 5km height of the ERL into our equation (6) above gives

T = -18 - (6.5 × (h - 5)) 

Using this equation we can perfectly reproduce the temperature at any height in the troposphere as shown in Fig 1. At the surface, h = 0, thus temperature at the surface Ts is calculated as

Ts = -18 - (6.5 × (0 - 5)) 

Ts = -18 + 32.5  

Ts = 14.5°C or 288°K

which is the same as determined by satellite observations and is ~33C above the equilibrium temperature with the Sun.

Thus, we have determined the entire 33C greenhouse effect, the surface temperature, and the temperature of the troposphere at any height, entirely on the basis of the 1st law of thermodynamics and ideal gas law, without use of radiative forcing from greenhouse gases, nor the concentrations of greenhouse gases, nor the emission/absorption spectra of greenhouse gases at any point in this derivation, demonstrating that the entire 33C greenhouse effect is dependent upon atmospheric mass/pressure/gravity, rather than radiative forcing from greenhouse gases.

The greenhouse gas water vapor does have a very large negative-feedback cooling effect on the surface and atmospheric temperature by reducing the lapse rate by half from the 10C/km dry rate to the 5C/km wet rate. Increased water vapor increases the heat capacity of the atmosphere Cp, which is inversely related to temperature by the lapse rate equation above:

dT/dh = -g/Cp

Plugging these lapse rates into our formula for Ts above:

Ts = -18 - (10 × (0 - 5)) = 32C using dry adiabatic lapse rate

Ts = -18 - (5 × (0 - 5)) = 7C using wet adiabatic lapse rate [fully saturated]

showing a cooling effect of up to 25C just from changes in the lapse rate from water vapor. Water vapor also cools the planet via evaporation and clouds, and which is confirmed by observations. Water vapor is thus proven by observations and theory to be a strong negative-feedback cooling agent, not a positive-feedback warming agent as assumed by the overheated climate models to amplify warming projections by a factor of 3-5 times. 

What about CO2? At only 0.04% of the atmosphere, CO2 contributes negligibly to atmospheric mass and only slightly increases the heat capacity Cp of the atmosphere, which as we have shown above, is inversely related to temperature. CO2 would thus act as a cooling agent by slightly increasing troposphere heat capacity. Increased CO2 also increases the radiative surface area of the atmosphere to enhance outgoing radiation to space, analogous to putting a larger heat sink on your microprocessor which increases radiative surface area and convection to cause cooling. 

It is well-known that CO2 and ozone are the primary cooling agents of the stratosphere up to the thermosphere, but even the warmist proponents are unable to agree on a coherent explanation why CO2 would assume the opposite role of a warming agent in the troposphere. As the mass/gravity/pressure greenhouse theory shows, and just like water vapor, CO2 also acts to cool the troposphere, and the rest of the atmosphere by increasing radiative surface loss and outgoing radiation to space. 

Millions of weather balloon observations confirm that there is no greenhouse gas-induced "hot spot" in the mid-upper troposphere, which is the alleged "fingerprint of AGW." The 2nd law of thermodynamics principle of maximum entropy production also explains why such a "hot spot" will not form. However, observations do show a cooling of the stratosphere over the satellite era, which would be consistent with increased CO2 increasing outgoing radiation to space. Observations also show an increase of outgoing longwave radiation to space over the past 62 years, which is entirely consistent with increased outgoing radiation from greenhouse gases and a decrease of "heat trapping", the opposite of AGW theory. 

In essence, the radiative theory of the greenhouse effect confuses cause and effect. As we have shown, temperature is a function of pressure, and absorption/emission of IR from greenhouse gases is a function of temperature. The radiative theory tries to turn that around to claim IR emission from greenhouse gases controls the temperature and thus pressure and heat capacity of the atmosphere, which is absurd and clearly disproven by basic thermodynamics and observations. The radiative greenhouse theory also makes the absurd assumption a cold body can make a hot body hotter, disproven by Pictet's experiment 214 years ago, the 1st and 2nd laws of thermodynamics, the principle of maximum entropy production, Planck's law, the Pauli exclusion principle, and quantum mechanics. There is one and only one greenhouse effect theory compatible with all of these basic physical laws and millions of observations. Can you guess which one it is?

Update: The atmospheric center of mass assumption in step 2 above also appears to be applicable to Titan, the closest Earth analog with a thick atmosphere in our solar system. For Titan, the surface temperature is 94K, equilibrium temperature with the Sun is 82K, and surface pressure is 1.47 bar. 

Thus, the center of mass of the atmosphere is located at ~1.47/2 = ~0.74 bar, which observations show is where Titan's atmospheric temperature is ~82K, the same as the equilibrium temperature with the Sun. I have added the notations in red to Robinson and Catling's graph below:




Update 2: Some still claim the ERL is set by radiative forcing, but this is false because:

1) A purely radiative model of the atmosphere without convection sets the ERL too high, at ~7km instead of ~5 km where observations show it is located. At 7km altitude, observations show the temperature to be 242K instead of the equilibrium temperature of 255K.

Solely radiative "greybody" model of the atmosphere without convection shown in blue. I have added in red the actual temperatures from the US Standard Atmosphere calculator. Note how the purely radiative model is up to 20K hotter, e.g. at the top of the troposphere, than the observations show. This is because convection dominates and "short-circuits" radiative forcing in the troposphere to cause cooling.


Open symbols show no relationship between tropopause height and troposphere temperatures
That's because, as Robinson and Catling have shown, the height of the troposphere and the adiabatic lapse rate that extends from the 0.1 bar tropopause all the way to the surface is controlled by pressure, not temperature nor radiative forcing from greenhouse gases:
"At higher pressures [P > 0.1 bar], atmospheres become opaque to thermal radiation, causing temperatures to increase with depth and convection to ensue. A common dependence of infrared opacity on pressure, arising from the shared physics of molecular absorption, sets the 0.1 bar tropopause"

3. We have already shown that temperature is a function of pressure, and radiance and emission spectra from greenhouse gases are in turn a function of temperature, not the other way around.  

73 comments:

  1. You are close, but you have not explained how the required thermal energy actually gets into the surface or to the base of the nominal troposphere of Uranus where it's 320K - hotter than Earth's surface.

    Nikolov & Zeller came close, but they are wrong in assuming high pressure causes high temperature. Temperature and density gradients are formed by gravity. Pressure is a corollary. Robinson and Catling may well get a rough relationship between pressure and temperature, but the physics tells us the temperature gradient is related to the quotient g/Cp reduced a little by inter-molecular radiation. I don’t see these guys explaining the necessary energy flows – as I have done.

    Why don’t you save your time and spend an hour reading my book, and you’ll then understand energy flows on Venus and probably agree with the two physicists who wrote positive 5 star reviews of the book. Email me a postal address to its.not.co2@gmail.com and I’ll post a free copy.

    ReplyDelete
    Replies
    1. Conduction between sun warmed gas molecules ?

      What else do you suggest ?

      Delete
    2. I suggest spam binning Doug's 140 personas by filtering on "my book"

      Delete
    3. Just as a side note,THE James Clerk Maxwell died in 1879, with significant publications in the 1860's and 1870's. So perhaps you are referring to a different Maxwell who was published in 1888.

      Delete
    4. I am definitely referring to the great physicist James Clerk Maxwell, and page 331 quoted above in his book Theory of Heat [this is apparently the 10th edition published in 1902 "with additions and corrections by Lord Rayleigh"] in entirely is available here:

      https://archive.org/stream/theoryofheat00maxwrich#page/n349/mode/2up

      But here is a pdf of the entire 3rd edition which was published in 1872

      http://www3.nd.edu/~powers/ame.20231/maxwell1872.pdf

      I'm not sure when the 1st edition was published, but if you find out, pls let me know. In the meantime I'll change the date to the third edition 1872 in the post.

      Thanks for pointing out.

      Delete
  2. Pretty much as described here:

    http://www.newclimatemodel.com/greenhouse-confusion-resolved/

    back in 2008

    but with added maths.

    ReplyDelete
  3. Your "hydrostatic equilibrium" is identical to thermodynamic equilibrium and that is fundamentally important to understand if you really want to understand the "heat creep" process which is a corollary of the Second Law of Thermodynamics. That non-radiative heat transfer mechanism downwards is what obviates any need for assumed (though impossible) heat transfer from a colder troposphere to a warmer surface.

    ReplyDelete
    Replies
    1. Downwards ?

      Don't you mean upwards via conduction from the sun warmed surface ?

      Delete
    2. Mr Wilde,

      You continue to imply, after all these years, that the surface is always warmer and thus, heats the air directly above, via conduction and that that is how the atmosphere is warmed. Which incidentally, also happens to be a major pillar of the debunked "GHE" hypothesis.

      Yet the radiosonde data clearly shows that over most of the Earths solid surface, most of the year round, the ground is actually cooler than the air above it. While the oceans covering the remaining 70% of the Earths non-gaseous surface cannot conduct heat the air above because of evaporative cooling.

      It's about time you changed the record mate!

      W R Pratt

      Delete
    3. W R Pratt

      Where the sun is shining the surface is warmer than the air and where it is not shining the air is warmer than the surface. That is on average and through the system as a whole, not necessarily locally or regionally due to winds.

      The energy held by the air at any given time was initially obtained by conduction from the solid surfaces.

      Water is different. Solar energy enters past the evaporating layer and then is distributed between water molecules by conduction. Evaporation results but does not fully negate that initial accumulation of conducted energy due to the weight of the atmosphere pressing down on the surface.

      So, sadly, you are wrong.



      Delete
    4. Stephen WildeNovember 25, 2014 at 2:05 AM

      "Where the sun is shining the surface is warmer than the air and where it is not shining the air is warmer than the surface."

      Wrong! This is entirely dependant on the surface material. Most of the Earths solid surface that has strong enough incident sunlight to heat the ground above the temperature of the air, is also covered in vegetation. Vegetation does not heat the air by conduction, in fact it cools it. This can be seen in the radiosonde data. Regions of the Earths surface which are not covered in vegetation and do get warm enough to potentially heat the air above are only localised and therefore cannot possibly be responsible for the atmospheres diurnal 2pm max-4am min, temperature cycle.

      "That is on average and through the system as a whole, not necessarily locally or regionally due to winds.

      The energy held by the air at any given time was initially obtained by conduction from the solid surfaces."


      Wrong again Mr Wilde, unless of course you believe wind travels at light speed!

      If local conditions are stable, the warmest part of the day, the diurnal max, is ALWAYS at 2 pm, regardless of surface material. Again, empirical observation disproves your Wilde assertions. This kind of empirical observation is evidence that incident sunlight heats both the surface and the air.

      "Water is different. Solar energy enters past the evaporating layer and then is distributed between water molecules by conduction. Evaporation results but does not fully negate that initial accumulation of conducted energy due to the weight of the atmosphere pressing down on the surface."

      Well, lets see now, if what you say here was correct, then the temperature of the near surface atmosphere would need to always closely track the temperature of the ocean below. I have yet to see any data to support that Wilde assertion. Therefore the ocean is not able to conduct any significant heat to the atmosphere directly above it and again, if it could it would be a purely localised phenomena which cannot account for the diurnal atmospheric temperature cycle.

      Perhaps you have such data to prove me wrong on that. I look forward to seeing that from you.

      W R Pratt








      Delete
    5. The temperature of the near surface atmosphere does indeed closely track the temperature of the ocean below. Meteorologists rely on that for predicting temperatures over land when air flows off the nearby ocean.

      The rest of your post is too confused to merit a response.

      Delete
    6. You have no data the Stephan?

      W R Prat

      Delete
  4. A very fine post; thanks much. It was well written and easy to follow. I only wish all the luke-warmers would read it with an open mind.

    ReplyDelete
  5. So this could explain why the tropospheric hot spot is missing. Instead of warming, the energy that would have formed the hotspot becomes Gravitational Potential Energy?

    ReplyDelete
    Replies
    1. Yes absolutely, I just added the explanation of that and more at the end of the post

      Delete
    2. Indeed, and further, ALL energy that goes into lifting the atmosphere against gravity but which is not radiated to space from within the atmosphere goes to gravitational potential energy.

      Then it returns to kinetic energy during the inevitable descent and THAT is what raises surface temperature by 33C above the S-B prediction.

      It is all about mass, gravity and insolation.

      It is variations in the rate of convection that regulates the flow of kinetic energy back to the surface from gravitational potential energy higher up which negates the thermal effect of radiative gases.

      Convection controls the balance between radiation and conduction in order to maintain system stability.

      Delete
  6. Response by Climatepete

    The article contains the seeds of its own destruction because it says "It is well-known that CO2 and ozone are the primary cooling agents of the stratosphere up to the thermosphere....".

    For a significant part of the infra-red spectrum emitted by the earth back into space it is the temperature of the stratosphere which determines the power radiated into space by the top of the atmosphere. However, the incoming solar radiation is visible light radiation and CO2 and ozone are transparent to those frequencies.

    Now think about it - say you have an atmosphere with no CO2 and you add some CO2. From the "primary cooling agents" comment above the temperature of the stratosphere goes down, and therefore so does the radiation emitted back into space from the stratosphere and hence the radiation emitted back into space from the top of the atmosphere also goes down. The radiation from sunlight reflected directly back into space doesn't change. Why should it? All we have done is added a miniscule quantity of CO2 which is transparent to visible light.

    But the incoming radiation doesn't reduce because CO2 has no effect on this.

    The radiative forcing by definition is the difference between solar radiation received and the radiation emitted back into space at the top of the atmosphere. Adding CO2 makes no different to the incoming or reflected sunlight, but has reduced the outgoing infra-red radiation. Therefore, by the law of conservation of energy it has increased the radiative forcing and the temperature of the surface has to go up.

    In other words the phrase "It is well-known that CO2 and ozone are the primary cooling agents of the stratosphere up to the thermosphere...." carries with it an implication that adding CO2 must somehow have increased radiative forcing and therefore surface temperatures. We don't even need to postulate a mechanism to know this to be true.

    Regards,
    Climatepete

    ReplyDelete
    Replies
    1. "the temperature of the stratosphere goes down, and therefore so does the radiation emitted back into space from the stratosphere and hence the radiation emitted back into space from the top of the atmosphere also goes down." is backwards.

      Increased CO2 increases IR radiative surface area of the troposphere through thermosphere, but we'll just talk about the stratosphere. CO2 cools the stratosphere both by radiating the heat received primarily from convection from the surface through the troposphere, but also direct IR from the surface through the atmospheric window.

      I'm sorry, but a cooling agent that enhances radiative losses to space can only cool, not warm, any part of the atmosphere.

      Delete
    2. Your understanding is flawed.

      Assume for the sake of clarity a black-body infra-red spectrum of power emitted from the ground which is dependent on the temperature at every wavelength. Then introduce the CO2 into the atmosphere.

      In case you didn't know, the atmosphere (with CO2) is opaque to 10 micron radiation emitted directly from the ground - i.e. you cannot image tanks with hot gun barrels and other stuff from space using the 10 micron band. The 10 micron radiation you see from space comes mainly from the stratosphere so anything from the ground has been absorbed and re-emitted many times as seen from space.

      Now if a molecule of anything is in thermodynamic equilibrium with the gas around it then its emissions CANNOT BE MORE at any wavelength than the black-body spectrum for the given temperature, because if they were you could use the imbalance to generate power from evenly distributed heat, which cannot happen by the second law of thermodynamics (e.g. a solar cell sensitive to that wavelength would generate power because it would receive more heat at that wavelength than it naturally emitted)

      Therefore, if CO2 cools the stratosphere (which you say it does), and if the direct 10 micron radiation comes from the stratosphere (which it does), then the black-body radiation emitted from the stratosphere must be weaker at all wavelengths purely because the temperature is lower. Sure some radiation still gets through the stratosphere from below, but the power is the same as it was with the original stratospheric temperature before CO2, not higher. Any bands where the radiation comes from the stratosphere have to have a lower power emitted because of the lowering of temperature.

      Doesn't matter whether the temperature of the stratosphere is because of convection or because of other effects - if it is lower then at certain bands the emissions will be lower with CO2 that without CO2, which means that overall the radiation at the top of the atmosphere emitted back to space is lower as a direct consequence of the lower stratospheric temperature.

      Thus your phrase "a cooling agent that enhances radiative losses to space" is directly forbidden by the laws of thermodynamics.

      Note that convection cannot itself carry heat beyond the top of the atmosphere because no molecules are actually lost into space as they don't have the energy to escape.

      Regards,
      Climatepete

      Delete
    3. CO2 peak absorption/emission is at 15u, not 10u. 10u is part of the "atmospheric window" of direct emission to space from the surface (although O3 absorbs/emits nearby)

      http://www.junksciencearchive.com/Greenhouse/2-03.jpg

      By Wien's displacement law, 15u emission is equivalent to a BB temperature of -80C. No matter where CO2 is located in the troposphere/stratosphere/etc or the concentration of CO2, or the temperature of the surrounding air, CO2 still absorbs/emits at 15u/-80C, which is colder than any part of the atmosphere.

      There is no convection in the stratosphere. Convection stops at P=0.1 bar tropopause as shown by R&C above.

      Even the most ardent warmists admit CO2 cools the stratosphere, although they don't agree on why.

      http://hockeyschtick.blogspot.com/2014/08/why-does-co2-cool-stratosphere-warm.html

      Delete
    4. Here's an illustration of the "atmospheric window" from the surface, showing between 8-12 microns [near-IR with higher energy/frequency] most of IR radiation travels directly from the surface to space without running into any GHGs [except O3 a bit], a large negative radiative forcing. Earth's peak IR emission is at 10-11 microns, where most of it isn't impeded by GHGs at all.

      http://scienceofdoom.files.wordpress.com/2010/04/longwave-downward-radiation-surface-evans.png

      Delete
    5. climatepete said:

      "say you have an atmosphere with no CO2 and you add some CO2. From the "primary cooling agents" comment above the temperature of the stratosphere goes down, and therefore so does the radiation emitted back into space from the stratosphere and hence the radiation emitted back into space from the top of the atmosphere also goes down."

      Radiation to space from within the atmosphere increases from the introduction of GHGs but the amount of energy returned to the surface in adiabatic descent declines so that less energy is then radiated directly to space from the surface leaving the net radiative exchange with space unaffected.

      Meanwhile the surface temperature is unaffected too because the reduction in energy returning to the surface in adiabatic descent is offset by the increased density of the air at the surface which can then conduct more of the solar energy passing through.

      Leakage from the adiabatic cycle of ascent and descent (caused by the presence of radiative gases) simply results in a less high atmosphere (less work is done against gravity due to the leakage) and so surface density becomes higher at the same atmospheric pressure.

      Gas Laws apply at all times.

      Delete
  7. MS, very nice, seems complete and it matches several emperical results regarding IR opaque layers "blocking" heat flow, ie the R. W. Wood experiment from 100 years ago.

    Did you know that R. W. Wood disproved the exsistence of "N - Rays" as well ?

    Maybe there needs to be some "blanket" re-thinking of popular unproven hypothesis now

    Cheers, KevinK

    ReplyDelete
    Replies
    1. Ah, physicist RW Wood, the world's first CAGW skeptic and prime example of why the best scientists are skeptics of the "overwhelming scientific consensus"

      Blanket/greenhouse analogy to gases free to convect is just plain dumb

      Delete
  8. Stephen and Roger:

    Yes conduction, diffusion, convection (which includes diffusion) from cold to warm in accord with the process described in statements of the Second Law of Thermodynamics. The explanation has been published in March this year in two chapters (complete with graphics) you know where. After all, on Uranus the only source of new thermal energy is mostly in the absorbing methane layer near TOA where it's colder than 60K. But the base of the nominal troposphere of Uranus is 320K. You need to explain energy flows my friends, and your explanation should be applicable universally - for example, throughout the Solar System and no doubt beyond.

    ReplyDelete
  9. Sorry, but I don't get this approach at all. Here is the premise for this analysis:

    "We are determining the temperature gradient within the mass of the atmosphere and the equilibrium temperature is thus at the center of mass. The "effective radiating level" or ERL of planetary atmospheres is located at the approximate center of mass of the atmosphere where the temperature is equal to the equilibrium temperature with the Sun. The equilibrium temperature of Earth with the Sun is commonly assumed to be 255K or -18C as calculated here. As a rough approximation, this height is where the pressure is ~50% of the surface pressure. It is also located at the approximate half-point of the troposphere temperature profile set by the adiabatic lapse rate, since to conserve energy in the troposphere, the increase in temperature from the ERL to the surface is offset by the temperature decrease from the ERL to the tropopause."

    But all this only works (at least to a fair approximation) with the Earth. It doesn't work at all with the other planets, notably Venus and Mars.

    Check it out for yourselves. The fundamental premise behind this approach thus fails.

    ReplyDelete
    Replies
    1. No it absolutely does work perfectly for Venus as I tweeted today:

      https://twitter.com/search?q=90bar%2F2&src=typd

      Atmosphere on Mars is too thin to sustain much convection, that's why the convection > radiative forcing principle only applies to the planets with thick atmospheres shown in Fig 1 above.

      Delete
    2. For Venus, surface P=90 bar

      90 bar/2 = 45bar

      45 bar is at a height of ~20km per Magellan mission:

      https://pbs.twimg.com/media/B3PH_6ICIAAFJEW.jpg

      Venus equilibrium temperature with the Sun = 260C
      Venus lapse rate =10C/km

      260C+10C/km*20km = 460C = Ts

      Delete
    3. Uhm, no. Venus lapse rate: ~8 K/km. 46 bar is at ~12 km. Surface temp: 735K. Temp at 12 km: [735 - (12*8) =] 639K. Venus radiating temperature in space: 184K (Bond albedo 0.9) or 232K (albedo 0.75). Former at 80+ km (0.003 bar), latter at 65 km (0.1 bar).

      http://www.datasync.com/~rsf1/vel/1918-3b.gif
      https://pbs.twimg.com/media/B3PH_6ICIAAFJEW.jpg

      There's plenty of convection on Mars. The ERL is about 2.5 K/km. The surface temp is about the same as the planetary effective emission temperature to space: 210K.

      There is no connection.

      Delete
    4. Mars:

      According to R&C: "Mars’ low surface pressure of
      ∼0.006 bar means that it does not fall within our scope of examining
      commonalities in thick atmospheres and so Mars is not plotted
      in Fig. 3a."

      Venus:

      You're right I made an error on Te of Venus and so will begin anew to establish whether the CoM concept applies to Venus, and to Titan...

      "Venus does not have a well-developed tropopause temperature
      minimum in the global average because it lacks a significant
      stratospheric inversion, which is consistent with our tropopause
      theory. However, Venus is marginal (Fig. 3a) and, in fact, possesses
      a distinct tropopause temperature minimum at ∼0.1 bar in its mid
      to high latitudes17, and so conforms to the ∼0.1 bar rule when a
      minimum is seen (see Supplementary Information). The reason
      for the latitudinal variations in tropopause sharpness is unknown
      but may be a modulation of the radiative–convective mean state
      by a Hadley-like meridional circulation above the cloud tops18.
      The interpretation is complicated by the presence of unknown
      absorbers at 0.2–0.5 µm (ref. 19)."

      Venus is a special case and very odd planet in comparison to all the others with thick atmospheres as R&C and others have discussed, including opaque TOA, and convection/lapse rate extends way beyond 0.1 bar up to 0.001 bar as shown by R&C, unlike any of the other planets which were analyzed by R&C, so I'm going to think about this some more regarding center of mass from a thermodynamic standpoint on Venus, and maybe ask Claes Johnson about the CoM concept with respect to the special case of Venus and wrt Earth.

      Let me know if you have any other suggestions, but just because Mars doesn't apply and Venus could be a special case, no doubt pressure determines the Venus temperature profile, not radiative forcing, so still doesn't support the radiative theory of the GHE vs. the mass/pressure theory of the GHE.

      Delete
    5. I updated the post adding data for Titan, the closest Earth analog with a thick atmosphere, and it appears the CoM assumption is applicable to Titan. Agreed?

      Delete
    6. I believe the Mars discussion founders on empirical observations. Mars is subject to "dust devils" and thus, convection is definitely actively cooling the surface, regardless of the density of the atmosphere. Evidently the same principles applied in the article pertain to Mars.

      Delete
  10. Close, however the earth has *two* photospheres, the solid surface and the cloud tops. The radiative equilibruim height for the equator are the cloudtops, The equilibrium height for the desert areas is the surface. 80% of heat is radiated from the desert surface of the Sahara and australia. Look at infrared images of Meteosat to get the picture.

    ReplyDelete
    Replies
    1. The ERL is (on global average) the height at which T ≈ 255K = equilibrium temperature with the Sun. However, T is a function of P, and radiance/emission spectra a function of T, not the other way around as climatologists assume.

      Delete
  11. I think there is an error in Figure 1. The tic mark labelled 0.5 bar looks to me like 0.4 bar. There is a missing tic mark between that and 1 bar, so it looks right if you count down from 1 but wrong if you count up from 0.1. This messes up the perfect agreement with 255K, more like 260K or more.

    ReplyDelete
    Replies
    1. Yeah looks like R&C left off the tick mark for 1.0 and that's exactly what I did count back from what I thought was 1.0 but is apparently 0.9 instead. Thanks for pointing that out, but Fig 1 from R&C is very low resolution graph anyway to show all of the planets with thick atmospheres on a single graph.

      Not to worry, the US Standard Atmosphere Calculator

      http://www.digitaldutch.com/atmoscalc/

      Shows at 5.1km the temperature is 255.0K and P=533 millibars = 0.53bar

      Thus, almost precisely what I showed in the post:

      P ≈ 0.5 bar and T = 255K at ≈ 5km.

      Delete
  12. As I keep saying, the 255K temperature is invalid because it is for an impossible situation in which there is no water vapour, but supposedly still exactly the same cloud cover reflecting 30% of solar radiation back to space. If you don't reduce (by 30%) the solar radiation to the surface of an Earth without GHG then you get about 278K, not the 255K which Hansen and Pierrehumbert et al claim then leads to 33 degrees of warming.

    Note also that the altitude about which the temperature profile rotates as water vapour varies is only around 3.5Km to 4Km because we need the altitude where radiation to space from above equals that from below, including the surface. Even the centre of mass is lower than 5Km because of the density gradient which, by the way, also results from the process described in statements of the Second Law of Thermodynamics - in exactly the same way that the temperature gradient evolves as entropy approaches the maximum.

    ReplyDelete
    Replies
    1. 255K is confirmed by the radiosonde data.

      W R Pratt

      Delete
    2. W R Pratt misses the point that the 255K figure supposedly relates to an imaginary Earth without water vapour or any greenhouse gases. Hence radiosonde data regarding the real Earth with clouds reflecting 30% of the solar radiation is not relevant. My whole point is that there would be no clouds in the absence of water vapour.

      Yet there in black and white in Pierrehumbert's book we see him multiplying the radiative flux by 0.7 which is deducting the 30% of solar radiation which would not need to be deducted because there would be no clouds. Take out the 0.7 and you get a more correct temperature of 278K for that imaginary dry rocky planet.

      Is this a valid point? You bet it is. The IPCC clearly claims that the real Earth is 33 degrees hotter than the imaginary planet, whereas in fact it is less than 10 degrees hotter. And even that is very rough and it could be cooler because the 278K figure does not take into account the T^4 relationship. In fact, when water vapour increases from about 1% to 4% we get a few degrees of cooling easily observed in real world temperature data as in my published study in the book. The cooling is at least partly due to cloud cover that increases with increasing water vapour.

      Delete
    3. As I said Doug, 255K is confirmed by the radiosonde data. Regardless of your arguments to the contrary, 255K is observed by satellite and radiosonde data.

      Empirical evidence is what you are arguing against.

      That is the point.

      Delete
  13. Radiation between a warmer surface and a cooler troposphere is cooling the surface. Only radiation from a hotter source can raise the temperature of a cooler target, and only to a maximum as per Stefan Boltzmann calculations. Even those calculations become irrelevant if that target does not meet the definition of a black or grey body that does not gain or lose thermal energy by non-radiative processes, only by radiation. But you can work out the maximum mean surface temperature that radiation could support, and, for 163W/m^2 of solar radiation reaching Earth's surface that mean temperature is around 35 degrees below freezing.

    The whole concept of "radiative forcing" has absolutely no basis in physics. Radiation from a cooler source can only slow that portion of the cooling of a warmer target which is itself by radiation. Radiation from a colder troposphere does not slow the rate of evaporative cooling or conduction across the surface/atmosphere interface. (See my March 2012 paper.) These non-radiative processes can and will accelerate to nullify the reduction in radiative cooling. In any event, one molecule of carbon dioxide in 2,500 other molecules has absolutely minuscule effect on the rate of radiative cooling of Earth's surface. It does not affect the maximum which must be explained by another process in a completely different paradigm that does indeed operate throughout the Universe.

    Radiation from the cooler troposphere cannot be added to solar radiation and the total used in Stefan Boltzmann calculations. Even those calculations overstate the temperature because the surface is simultaneously losing energy from some of the solar radiation by non-radiative processes. You need to explain how the necessary thermal energy gets into the surfaces of Earth, Venus etc. And you need to do this in keeping with the laws of physics, as I have done successfully and in agreement with empirical data.

    ReplyDelete
  14. MS, my replies to Steven Wilde and Doug Cotton have gone missing.

    W R Pratt

    ReplyDelete
  15. "I suggest spam binning Doug Cotton's 140 personas"

    I highly recommend that as well. He’s an infiltrator, and pretends that heat conducts down from the top of the atmosphere or some stupid thing, without showing the math for it because according to him, physics doesn’t always need to be explained with math…

    What he does is he will clog up your comments with such reams of his spam and silly pontificating that makes it impossible for anyone to extract any valid content from honest commentators. He's a tool of the alarmist machine working to make critical assessment of the climate scam look unalluring.

    ReplyDelete
  16. Great article.

    It's mathematical law...beyond physics law. The average of a sequential distribution is necessarily found around the middle of that distribution, not at either extremity, and thus, in the case of the atmosphere, the bottom must be warmer than the average - middle -, etc, and this arises without any concern or reference to "greenhouse gases" at all, although the "GHG" water vapour makes it cooler, not warmer. The entire basic premises of climate science are wrong, and misattributed.

    ReplyDelete
    Replies
    1. Thanks Joe! and thanks for all your many great articles.

      I was wondering if you had any thoughts as to applying this center of mass concept to the odd case of Venus heated from both top and bottom?

      Delete
  17. "...is dominated by convection/pressure/lapse rate in the troposphere up to where the tropopause begins at pressure = 0.1bar. When P < 0.1 bar, the atmosphere is too thin to sustain convection..."

    If I may,

    1) the tropopause is defined by temperature, not pressure. The tropopause is, on average, about twice as high at the equator than it is at the poles.

    2) the vertical limit on convection is, as well, defined by temperature not by pressure. If you have a low/mid-level (below the observed tropopause) temperature inversion, that inversion will cap any convection that cannot exceed the inversion differential...i.e. across most of the tropics. The strength of the Tradewind Inversion caps any deep convection to areas of localized surface convergence (easterly waves, sea breeze fronts, etc.), areas of broad upper-level divergence & such but the low-level tradewind cumulus area there nearly 24/7.

    Regards

    ReplyDelete
    Replies
    1. Please read Robinson & Catling Nature 2014. The whole point of that paper is to explain why the tropopause on all those planets is located at P=0.1bar, I.e. The height of the tropopause is set by pressure alone, not radiative forcing from GHGs.

      Delete
    2. Im puzzled by the 0.1 bar aspect.

      I can see that at some point density becomes too low to sustain convection but on Earth it is the temperature inversion at the tropopause which stops
      further convection and thereby creates the tropopause.

      Additionally, there is a slow large scale convective overturning in the stratosphere too. The Brewer Dobson Circulation.



      Delete
    3. "Please read Robinson & Catling Nature 2014. The whole point of that paper is to explain why the tropopause on all those planets is located at P=0.1bar, I.e. The height of the tropopause is set by pressure alone..."

      MS - Thanks, but I'm not going to pay the $5. I never once said or implied the tropopause is set by radiative forcing from GHG. You are all missing the point that these figures are based on a "Standard Atmosphere" of a fixed surface temperature. The tropopause is set from the surface temperature & the lapse rate that follows from the surface temperature. That is why the tropopause at the colder poles is lower in height (higher pressure) and is higher in height (lower in pressure) at the warmer equator.

      Also, convection in the troposphere is capped by the level of the tropopause (regardless what pressure level it is) because the tropopause is defined by the WMO & AMS as a change in the lapse rate not by a fixed pressure level. This has been known since it's discovery back in the late 1800s and is basic meteorology & just because Robinson & Catling want to redefine it does not make it so.

      Now, regarding your model/equation - if you can change the surface temperature & it will correctly reflect the change in the height of the tropopause, then it holds promise but if you are presuming the tropopause is at a fixed height for the whole globe (pole to equator), it has problems & is wrong.

      Delete
  18. "Yet the radiosonde data clearly shows that over most of the Earths solid surface, most of the year round, the ground is actually cooler than the air above it."

    Radiosondes do not actually measure the temperature of the "ground". They start by measuring the temperature of the air about 1-2 meters above the ground, which is persistently cooler than the ground itself. Experiments have shown that the coldest part of a nighttime near the ground temperature inversion is about 10 cm above the ground with the ground itself being several degrees warmer than that minimum temp.

    Carl

    ReplyDelete
    Replies
    1. "Radiosondes do not actually measure the temperature of the "ground". They start by measuring the temperature of the air about 1-2 meters above the ground,

      I didn't say they did. In fact most soundings begin at 150-200 meters above the ground, not 1-2 meters.

      What I am referring to is the ability to closely predict the surface temperature from radiosonde data, compared to actual ground based measurements.

      This can be achieved by finding the altitude of -18º C in any particular sounding and then using the normal lapse rate of 6.5º C per km, to calculate the surface temperature.

      Where the radiosonde data predicts a higher temperature than the actual ground based measurement, then the air directly above the surface is obviously warmer than the ground and vice-versa.

      Over most of the Earths solid surface however, there is a temperature inversion in the first 4' above the ground. This is the reason why Stevenson screens are always placed 4' above the ground.

      "Experiments have shown that the coldest part of a nighttime near the ground temperature inversion is about 10 cm above the ground with the ground itself being several degrees warmer than that minimum temp."

      That will obviously depend on time of year and location. However, at the opposite side of that diurnal cycle, i.e., the warmest part of the day, the air will become warmer than the ground and a near surface temperature inversion will occur in the first 4' above the ground.

      W R Pratt

      Delete
    2. "This can be achieved by finding the altitude of -18º C in any particular sounding and then using the normal lapse rate of 6.5º C per km, to calculate the surface temperature"

      Nice, and do you have a link to the barometric pressure readings that correspond to height where temperature = -18C? And the surface pressure at that same location. By what I'm showing, that height should be where pressure = ~.5*surface pressure.

      Delete
    3. Hi MS,

      This is the link to the soundings I use: http://weather.uwyo.edu/upperair/sounding.html

      I would say it looks to me, though I haven't looked at pressure until now, that -18º C will be at approximately .5* the surface pressure in ant given sounding. Close enough to back up your work above.

      W R Pratt

      Delete
    4. Thanks much, when I get a chance I hope to work out several specific examples, and if you have any to share, please let me know. Thanks again for your help.

      Delete
    5. You are welcome.

      I do have another piece of corroborating evidence I would like to share with you as I said in the email I sent you. If you could reply to that we can discus it further offline.

      W

      Delete
    6. MS,

      Having had a quick look at the radiosonde data in the link I gave, I'm not seeing any direct link between pressure @ .5 and ERL of -18º C.

      All the evidence I have, indicates that Earths atmosphere is heated by direct incident EMR. Pressure is the result, not the cause, but to a large extent pressure, is determined by gravity.

      While obviously there is a certain amount of variation, the vertical pressure gradient appears to be fairly stable compared to the temperature gradient.

      W R Pratt

      Delete
  19. Here is the relevant extract from the R & C paper:

    "the tropopause separates a stratosphere with a temperature profile that is controlled by the absorption of short-wave solar radiation, from a region below characterized by convection, weather and clouds5, 6. However, it is not obvious why the tropopause occurs at the specific pressure near 0.1 bar. Here we use a simple, physically based model7 to demonstrate that, at atmospheric pressures lower than 0.1 bar, transparency to thermal radiation allows short-wave heating to dominate, creating a stratosphere. At higher pressures, atmospheres become opaque to thermal radiation, causing temperatures to increase with depth and convection to ensue. A common dependence of infrared opacity on pressure, arising from the shared physics of molecular absorption, sets the 0.1 bar tropopause"

    So it looks like the pressure reduction to 0.1mb somehow alters the ability of the air to respond to incoming solar radiation such that a temperature inversion is created at or near 0.1mb largely independently of composition though for Earth it is the accumulation of ozone around that pressure point that does the trick for Earth.

    ReplyDelete
  20. That's the money quote: "At higher pressures, atmospheres become opaque to thermal radiation, causing temperatures to increase with depth and convection to ensue. A common dependence of infrared opacity on pressure, arising from the shared physics of molecular absorption, sets the 0.1 bar tropopause"


    "vertical stratification, with warmer layers above and cooler layers below, makes the stratosphere dynamically stable: there is no regular convection and associated turbulence in this part of the atmosphere. The top of the stratosphere is called the stratopause, above which the temperature decreases with height."

    https://www.princeton.edu/~achaney/tmve/wiki100k/docs/Stratosphere.html

    Since the Brewer Dobson circulation is so slow perhaps it has little effect?

    ReplyDelete
    Replies
    1. I just added at the end of the post additional reasons why the ERL is set by pressure, not temperature or GHG radiative forcing.

      Delete
  21. Please forgive my ignorance with these questions.

    How does the fact that the depth of the atmosphere at the equator is more than double the depth at the poles affect these discussions? (ie: 7km poles vs. 18km equator)

    Is this fact considered within the relevant calculations? Further, how is this determined and factored in on other planets? Is the Venusian atmosphere also twice as deep at the equator than the poles? If not, how does this change things?

    ReplyDelete
    Replies
    1. We are dealing with global averages in this post, but the same general principle should apply most anywhere since the lapse rate = -g/Cp everywhere. The heat capacity at constant pressure Cp varies widely depending on the pressure and water vapor content, adjusting the lapse rate accordingly. Also the equilibrium temperature with the Sun varies with solar insolation, thus the surface temperature calculation at a given location, but as a global average it is 255K.

      Fig showing lapse rate of the "standard" average atmosphere, poles, and tropics:

      http://globalwarmingsolved.com/wp-content/uploads/2013/12/non-standard.jpg

      Delete
    2. "If I may,

      1) the tropopause is defined by temperature, not pressure. The tropopause is, on average, about twice as high at the equator than it is at the poles."

      "Please read Robinson & Catling Nature 2014. The whole point of that paper is to explain why the tropopause on all those planets is located at P=0.1bar, I.e. The height of the tropopause is set by pressure alone, not radiative forcing from GHGs. "

      OK...at first you disagree with me...then, here, you agree with me...that the tropopause height is 'not' fixed but varies with the surface temperature & is defined as a change in lapse rate which agrees with the WMO & AMS. Your web link confirms that. Please explain...which is it?

      Thanks!

      Delete
  22. Good article

    Comment has been made that the results above do not apply very well to Mars and Venus.

    This is only to be expected.

    The Barometric Equations and the Perfect Gas Laws are only true if the Specific Heat Capacity stays constant while the temperature changes.

    This is true for our atmosphere mainly N2 and O2.
    It is not true for Mars and Venus where CO2 forms a major part of the atmosphere.

    http://www.engineeringtoolbox.com/carbon-dioxide-d_974.html

    Bryan

    ReplyDelete
    Replies
    1. Thanks Bryan, that's a very helpful point, and probably explains why the CoM works for Earth and Titan, but not Mars and Venus.

      Titan atmosphere has similar non-greenhouse-gas percentages to Earth:

      "98.4% nitrogen with the remaining 1.6% composed mostly of methane (1.4%) and hydrogen (0.1–0.2%)"

      Any other thoughts on the center of mass concept?

      Thanks again.

      Delete
  23. A general point in the hope that it will assist.

    Any planet can only retain an atmosphere if energy in equals energy out over the long term.

    That requires a specific rate of cooling with height which is the 'ideal' lapse rate determined only by mass and gravity. Insolation then determines the length of vertical travel for that ideal lapse rate.

    Every planet has an atmosphere with a different composition and there is vertical layering plus horizontal mixing which creates a vast plethora of different lapse rates from place to place and time to time.

    However, ALL those different actual lapse rates MUST net out to the ideal lapse rate if the atmosphere is to be retained.

    Variable convection sees to it that they do all net out to the ideal lapse rate.

    There will be differences from planet to planet depending on how the different compositions configure convective overturning but the basic principle applies regardless.

    The head post is essentially correct even if refinements are possible.

    ReplyDelete
    Replies
    1. Well Stephen, I'm glad to see that you now appear to agree with me (and what's in my book published in March) that there is downward convection transferring thermal energy originally absorbed in the colder upper troposphere (especially on Venus and Uranus) to warmer regions and even into the warmer surface.

      When I wrote (two years ago) about downward heat transfer by convection (which includes diffusion) you seemed to think I was mistaken. I am not mistaken Stephen, and your comment clearly agrees with what I have said all along, namely that there has to be a non-radiative (convective) heat transfer downwards in lieu of the assumed transfer of thermal energy by radiation into the surface which cannot happen for a warmer surface.

      Delete
    2. Doug,

      As I recall, two years ago,you denied downward convection and insisted on downward diffusion.

      The former involves movement within the gravitational field thereby changing PE to KE whereas the latter does not.

      Furthermore, the energy that convects downward is not initially absorbed in the colder upper troposphere from incoming solar energy. Instead it is in the form of gravitational potential energy created by uplift from lower levels that then descends and reverts to heat as it does so.

      You can have direct absorption of energy from radiative gases higher up and that will be conducted downward as well as upward but it often doesn't reach the surface where there is convective overturning in a lower layer such as in our troposphere beneath or warmer ozone heated stratosphere.

      So, no we are not yet in agreement.

      There is indeed warming of the surface from convective overturning but that is not diffusion and describing it as a downward flow of thermal energy is incorrect because you miss out the conversion of thermal energy (KE) to gravitational potential energy (GPE) and back again.

      Delete
  24. MS, I think you should consider highlighting the two last posts of yours as features posts or something. They are both beyond my professional skills but seem to warrant a wider discussion.

    ReplyDelete
    Replies
    1. Thanks. Blogger doesn't have a "sticky post" feature to keep posts at the top, but I am going to be posting more on these issues with new posts linking back to these posts, so hopefully the discussion will continue. Thanks for your interest.

      Delete
  25. Note to Doug Cotton: I've received several complaints from readers to stop allowing you to spam threads. You've made your same points many times. The purpose of this thread is my GHE derivation, not your book, so I'm not publishing any more of your comments. Take care.

    ReplyDelete
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    1. I think you are on the right track, but as far a Venus not working out, well it's hard to apply something derived from the ideal gas laws to non-gases.
      The surface of Venus basically has no gas at all, it really only has CO2 as a super-critical fluid.
      For your formula to work, you need to apply it only to gases - I suggest only going down into Venus's atmosphere to the bottom of the gaseous envelope - not to the surface.
      However, it's correct to say that Venus is not hot because of the GHE; how can greenhouse gases 'trap heat' and keep the surface warm all through the Venusian 58-day 'night' when there is no sun?
      Less that 10% of the sun's energy reaches the surface anyway.

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  26. In the video shown here CO2 warming in the lower atmosphere is attributed to the following process: "....Near the Earth's surface, carbon dioxide absorbs radiation escaping Earth, but before it can radiate the energy to space, frequent collisions with other molecules in the dense lower atmosphere force the carbon dioxide to release energy as heat, thus warming the air.....". Does your model consider this?

    http://www.ucar.edu/news/releases/2006/thermosphere.shtml

    tsh

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