- 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.
Wednesday, 30 March 2022
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