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Soil moisture-evaporation coupling shifts into new gears under increasing CO2

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  • Hsin Hsu

    (George Mason University)

  • Paul A. Dirmeyer

    (George Mason University
    George Mason University)

Abstract

When soil moisture (SM) content falls within a transitional regime between dry and wet conditions, it controls evaporation, affecting atmospheric heat and humidity. Accordingly, different SM regimes correspond to different gears of land-atmosphere coupling, affecting climate. Determining patterns of SM regimes and their future evolution is imperative. Here, we examine global SM regime distributions from ten climate models. Under increasing CO2, the range of SM extends into unprecedented coupling regimes in many locations. Solely wet regime areas decline globally by 15.9%, while transitional regimes emerge in currently humid areas of the tropics and high latitudes. Many semiarid regions spend more days in the transitional regime and fewer in the dry regime. These imply that a larger fraction of the world will evolve to experience multiple gears of land-atmosphere coupling, with the strongly coupled transitional regime expanding the most. This could amplify future climate sensitivity to land-atmosphere feedbacks and land management.

Suggested Citation

  • Hsin Hsu & Paul A. Dirmeyer, 2023. "Soil moisture-evaporation coupling shifts into new gears under increasing CO2," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36794-5
    DOI: 10.1038/s41467-023-36794-5
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