Biophysical impacts of Earth greening largely controlled by aerodynamic resistance

Science Advances
Chi ChenRanga B Myneni

Abstract

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. Aerodynamic resistance is the dominant factor in controlling Earth greening's biophysical impacts: The increase in LAI produces a decrease in aerodynamic resistance, thereby favoring increased turbulent heat transfer between the land and the atmosphere, especially latent heat flux.

References

Jan 19, 2008·Nature·Martin Heimann, Markus Reichstein
Apr 1, 2015·Nature Communications·Yan LiShuangcheng Li
Feb 26, 2016·Science·Ramdane Alkama, Alessandro Cescatti
Feb 22, 2018·Nature Communications·Gregory DuveillerAlessandro Cescatti
Feb 20, 2019·Nature Sustainability·Chi ChenRanga B Myneni
Apr 6, 2019·Science Advances·Dan LiElena Shevliakova

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Citations

Nov 22, 2021·The Science of the Total Environment·Tingxiang LiuShizhuo Liu

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Software Mentioned

Community Earth System Model Version
AmeriFlux
TRM
Community Land Model Version 5 ( CLM5 )
R
MPI
CLM5

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