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Attribution of Global Soil Moisture Drying to Human.pdf
Abstract Anthropogenic impacts on widespread global soil moisture (SM) drying in the root zone layer
during 1948–2005 were evaluated based on the Global Land Data Assimilation System version 2 (GLDAS‐2)
and global climate models from the Coupled Model Intercomparison Project Phase 5 using trend analysis
and optimal fingerprint methods. Both methods show agreement that natural forcing alone cannot drive
significant SM drying. There is a high probability (≥90%) that the anthropogenic climate change signal is
detectable in global SM drying. Specifically, anthropogenic greenhouse gas forcing can lead to global SM
drying by 2.1 × 10−3 m3/m3, which is comparable to the drying trend seen in Global Land Data Assimilation
System version 2 (2.4 × 10−3 m3/m3) over the past 58 years. Global SM drying is expected to continue in the
future, given continuous greenhouse gas emissions.
Plain Language Summary Satellite observations and model simulations indicated widespread
soil moisture (SM) drying in the root zone layer. Global‐scale SM drying has also been corroborated by
meteorological drought indices. SM drying can accentuate the intensity of heat waves under global warming.
Recent record‐reaking heat waves were amplified by SM drying, such as the 2003 European heat waves and
2010 Russia heat waves. The contributions of human activities to global‐scale SM changes have not been
comprehensively evaluated. There is a high probability (≥90%) that the anthropogenic climate change signal
in global SM drying is detectable. Specifically, anthropogenic greenhouse gas forcing can lead to global
SM drying by 2.1 × 10–3 m3/m3, which is comparable to the drying trend seen in Global Land Data
Assimilation System version 2 (2.4 × 10–3 m3/m3) over the past 58 years. Global SM drying is expected to
continue in the future, given continuous greenhouse gas emissions.
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