Satellite observations show widespread increasing trends of leaf area index (LAI), known as the Earth greening. However, the biophysical impacts of this greening on land surface temperature (LST) remain unclear. Here, we quantify the biophysical impacts of Earth greening on LST from 2000 to 2014 and disentangle the contributions of different factors using a physically based attribution model.
... We find that 93% of the global vegetated area shows negative sensitivity of LST to LAI increase at the annual scale, especially for semiarid woody vegetation. Further considering the LAI trends (P ≤ 0.1), 30% of the global vegetated area is cooled by these trends and 5% is warmed ...
93% of the global vegetated area shows ∂Tsbio/∂LAI < 0 with an average of −0.36 ± 0.22 K m2 m−2 (mean ± 1 SD, where SD indicates spatial variability). We find that the mean magnitude of ∂Tsbio/∂LAI is larger in temperate regions (−0.44 K m2 m−2) than those in high-latitude (−0.34 K m2 m−2) and tropical regions (−0.29 K m2 m−2) ...
LAI = leaf area index = a measure of vegetation.
LST = land surface temperature
No comments:
Post a Comment