Attribution of Global Soil Moisture Drying to Human Activities: A Quantitative Viewpoint

Xihui Gu, Qiang Zhang*, Jianfeng LI, Vijay P. Singh, Jianyu Liu, Peng Sun, Changxiu Cheng

*Corresponding author for this work

    Research output: Contribution to journalJournal articlepeer-review

    75 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)2573-2582
    Number of pages10
    JournalGeophysical Research Letters
    Volume46
    Issue number5
    DOIs
    Publication statusPublished - 16 Mar 2019

    Scopus Subject Areas

    • Geophysics
    • Earth and Planetary Sciences(all)

    User-Defined Keywords

    • attribution
    • human activities
    • soil moisture

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