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Warming of hot extremes alleviated by expanding irrigation
Nature Communications ( IF 11.878 ) Pub Date : 2020-01-15 , DOI: 10.1038/s41467-019-14075-4
Wim Thiery; Auke J. Visser; Erich M. Fischer; Mathias Hauser; Annette L. Hirsch; David M. Lawrence; Quentin Lejeune; Edouard L. Davin; Sonia I. Seneviratne

Irrigation affects climate conditions – and especially hot extremes – in various regions across the globe. Yet how these climatic effects compare to other anthropogenic forcings is largely unknown. Here we provide observational and model evidence that expanding irrigation has dampened historical anthropogenic warming during hot days, with particularly strong effects over South Asia. We show that irrigation expansion can explain the negative correlation between global observed changes in daytime summer temperatures and present-day irrigation extent. While global warming increases the likelihood of hot extremes almost globally, irrigation can regionally cancel or even reverse the effects of all other forcings combined. Around one billion people (0.79–1.29) currently benefit from this dampened increase in hot extremes because irrigation massively expanded throughout the 20\({}^{th}\) century. Our results therefore highlight that irrigation substantially reduced human exposure to warming of hot extremes but question whether this benefit will continue towards the future.
更新日期:2020-01-15

 

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