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Land–atmosphere feedbacks exacerbate concurrent soil drought and atmospheric aridity

Sha ZhouDepartment of Earth and Environmental Engineering, Columbia University, New York, NY 10027;Park WilliamsLamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964;Alexis BergDepartment of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544;Benjamin I. CookLamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964;Yao ZhangDepartment of Earth and Environmental Engineering, Columbia University, New York, NY 10027;Stefan HagemannHelmholtz-Zentrum Geesthacht, Institute of Coastal Research, 21502 Geesthacht, Germany;Ruth LorenzInstitute for Atmospheric and Climate Science, Eidgenössische Technische Hochschule Zürich, 8092 Zürich, SwitzerlandSonia I. SeneviratneInstitute for Atmospheric and Climate Science, Eidgenössische Technische Hochschule Zürich, 8092 Zürich, SwitzerlandPierre GentineDepartment of Earth and Environmental Engineering, Columbia University, New York, NY 10027;

2019en

ABI

Annotatsiya

Compound extremes such as cooccurring soil drought (low soil moisture) and atmospheric aridity (high vapor pressure deficit) can be disastrous for natural and societal systems. Soil drought and atmospheric aridity are 2 main physiological stressors driving widespread vegetation mortality and reduced terrestrial carbon uptake. Here, we empirically demonstrate that strong negative coupling between soil moisture and vapor pressure deficit occurs globally, indicating high probability of cooccurring soil drought and atmospheric aridity. Using the Global Land Atmosphere Coupling Experiment (GLACE)-CMIP5 experiment, we further show that concurrent soil drought and atmospheric aridity are greatly exacerbated by land-atmosphere feedbacks. The feedback of soil drought on the atmosphere is largely responsible for enabling atmospheric aridity extremes. In addition, the soil moisture-precipitation feedback acts to amplify precipitation and soil moisture deficits in most regions. CMIP5 models further show that the frequency of concurrent soil drought and atmospheric aridity enhanced by land-atmosphere feedbacks is projected to increase in the 21st century. Importantly, land-atmosphere feedbacks will greatly increase the intensity of both soil drought and atmospheric aridity beyond that expected from changes in mean climate alone.

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Identifikatorlar

DOI: 10.1073/pnas.1904955116

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