Influence patterns of soil moisture change on surface-air temperature difference under different climatic background
Kang Jiang1, Zhihua Pan1, Feifei Pan2
1College of Resources and Environmental Sciences, China Agricultural University, Beijing 100194, China; CMA-CAU Jointly Laboratory of Agriculture Addressing Climate Change, Beijing 100194, China.
The Science of the Total Environment
|February 3, 2022
Summary
Soil moisture significantly impacts surface-air temperature difference (Ts-Ta), a key indicator of land degradation. Global analysis reveals complex, nonlinear relationships, with variations in soil moisture amplifying Ts-Ta in certain regions.
Area of Science:
- Earth System Science
- Climate Science
- Environmental Science
Background:
- Surface-air temperature difference (Ts-Ta) is crucial for sensible heat flux and land degradation assessment.
- The global-scale influence of soil moisture (SM) on Ts-Ta remains insufficiently understood.
Purpose of the Study:
- To investigate the impacts of soil moisture on the surface-air temperature difference at a global scale.
- To elucidate the complex interactions between soil moisture and Ts-Ta across diverse climatic conditions.
Main Methods:
- Utilized ERA5-land reanalysis data spanning from 1981 to 2019.
- Analyzed the relationship between soil moisture variations and surface-air temperature differences globally.
Main Results:
- Ts-Ta increased over 54% of global land, while soil moisture decreased across 70.7% of land areas.
- In areas with increased soil moisture, higher evaporation weakened the Ts-Ta increase.
- In areas with decreased soil moisture, Ts-Ta decreased at high SM levels but increased at low SM levels due to altered heat fluxes.
Conclusions:
- Soil moisture exerts a nonlinear influence on Ts-Ta, modulated by background SM and temperature.
- Variations in soil moisture can amplify Ts-Ta, particularly in regions with low soil moisture or low temperatures.
- Findings offer insights into regional climate change and improved land degradation indicators.
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