Anthropogenic warming has ushered in an era of temperature-dominated droughts in the western United States.

ABSTRACT: Historically, meteorological drought in the western United States (WUS) has been driven primarily by precipitation deficits. However, our observational analysis shows that, since around 2000, rising surface temperature and the resulting high evaporative demand have contributed more to drought severity (62%) and coverage (66%) over the WUS than precipitation deficit. This increase in evaporative demand during droughts, mostly attributable to anthropogenic warming according to analyses of both observations and climate model simulations, is the main cause of the increased drought severity and coverage. The unprecedented 2020-2022 WUS drought exemplifies this shift in drought drivers, with high evaporative demand accounting for 61% of its severity, compared to 39% from precipitation deficit. C

SUBMITTER: Zhuang Y 

PROVIDER: S-EPMC11540010 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature