DOI: 10.1002/2016JD025740
论文题名: Present-day irrigation mitigates heat extremes
作者: Thiery W. ; Davin E.L. ; Lawrence D.M. ; Hirsch A.L. ; Hauser M. ; Seneviratne S.I.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 3 起始页码: 1403
结束页码: 1422
语种: 英语
英文关键词: Climate
; extremes
; Irrigation
Scopus关键词: climate conditions
; climate modeling
; cooling
; extreme event
; heating
; irrigation
; land management
; regional climate
; temperature effect
英文摘要: 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. ©2017. The Authors. 资助项目: 2015-67003-23489
; DE-FC03-97ER62402/A010
; DE-SC0012972
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62682
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland; Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Brussels, Belgium; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Thiery W.,Davin E.L.,Lawrence D.M.,et al. Present-day irrigation mitigates heat extremes[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)