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Present‐day irrigation mitigates heat extremes

Thiery, Wim ; Davin, Edouard L. ; Lawrence, David M. ; Hirsch, Annette L. ; Hauser, Mathias ; Seneviratne, Sonia I.

Journal of geophysical research. Atmospheres, 2017-02, Vol.122 (3), p.1403-1422 [Periódico revisado por pares]

Chichester, UK: John Wiley & Sons, Ltd

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Título:
Present‐day irrigation mitigates heat extremes
Autor: Thiery, Wim ; Davin, Edouard L. ; Lawrence, David M. ; Hirsch, Annette L. ; Hauser, Mathias ; Seneviratne, Sonia I.
Assuntos: Asymmetry ; Atmosphere ; Climate ; Climatic extremes ; Communities ; Computer simulation ; Cooling ; Cooling effects ; Coupling ; Dry periods ; Drying ; Earth ; Economics ; Evaluation ; Exposure ; Extreme heat ; extremes ; Food ; Food production ; Food supply ; Foods ; Future climates ; Geophysics ; Heat ; Influence ; Irrigation ; Land management ; Mean temperatures ; Meteorology ; Regional development ; Regions ; Scale models ; Stems ; Strength ; Sustaining ; Temperature ; Temperature effects ; Temperature extremes ; Time measurement
É parte de: Journal of geophysical research. Atmospheres, 2017-02, Vol.122 (3), p.1403-1422
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Irrigation is an essential practice for sustaining global food production and many regional economies. Emerging scientific evidence indicates that irrigation substantially affects mean climate conditions in different regions of the world. Yet how this practice influences climate extremes is currently unknown. Here we use ensemble simulations with the Community Earth System Model to assess the impacts of irrigation on climate extremes. An evaluation of the model performance reveals that irrigation has a small yet overall beneficial effect on the representation of present‐day near‐surface climate. While the influence of irrigation on annual mean temperatures is limited, we find a large impact on temperature extremes, with a particularly strong cooling during the hottest day of the year (−0.78 K averaged over irrigated land). The strong influence on extremes stems from the timing of irrigation and its influence on land‐atmosphere coupling strength. Together these effects result in asymmetric temperature responses, with a more pronounced cooling during hot and/or dry periods. The influence of irrigation is even more pronounced when considering subgrid‐scale model output, suggesting that local effects of land management are far more important than previously thought. Our results underline that irrigation has substantially reduced our exposure to hot temperature extremes in the past and highlight the need to account for irrigation in future climate projections. Key Points Accounting for irrigation improves model skill Irrigation substantially reduces our exposure to heat extremes Nature of irrigation process yields asymmetric temperature responses
Editor: Chichester, UK: John Wiley & Sons, Ltd
Idioma: Inglês

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Present‐day irrigation mitigates heat extremes

Thiery, Wim ; Davin, Edouard L. ; Lawrence, David M. ; Hirsch, Annette L. ; Hauser, Mathias ; Seneviratne, Sonia I.

Chichester, UK: John Wiley & Sons, Ltd

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