Increase in ocean-onto-land droughts and their drivers under anthropogenic climate change

Yansong Guan, Xihui Gu*, Louise J. Slater, Jiabo Yin, Jianfeng Li, Solomon Hailu Gebrechorkos, Xiang Zhang, Dongdong Kong, Xuesong Yan*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

Abstract

Ocean-onto-land droughts (OTLDs)—i.e., droughts originating over the oceans and migrating onto land—are a recently identified phenomenon with severe natural and human impacts. However, the influence of anthropogenic emissions on past and future changes in OTLDs and their underlying mechanisms remain unclear. Here, using precipitation-minus-evaporation deficits to identify global OTLDs, we find OTLDs have intensified due to anthropogenic climate change during the past 60 years. Under a future high-emissions scenario, the OTLDs would become more frequent (+39.68%), persistent (+54.25%), widespread (+448.92%), and severe (+612.78%) globally. Intensified OTLDs are associated with reduced moisture transport driven by subtropical anticyclones in the northern hemisphere and complex circulation patterns in the southern hemisphere. The reduction in moisture transport during OTLDs is mainly caused by the atmospheric thermodynamic responses to human-induced global warming. Our results underscore the importance of improving understanding of this type of drought and adopting climate mitigation measures.

Original languageEnglish
Article number195
Number of pages12
Journalnpj Climate and Atmospheric Science
Volume6
DOIs
Publication statusPublished - 22 Nov 2023

Scopus Subject Areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Atmospheric Science

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