气候变化领域集成服务门户(CCPortal): Neglecting irrigation contributes to the simulated summertime warm-and-dry bias in the central United States

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DOI	10.1038/s41612-020-00135-w
	Neglecting irrigation contributes to the simulated summertime warm-and-dry bias in the central United States
	Qian Y.; Yang Z.; Feng Z.; Liu Y.; Gustafson W.I.; Berg L.K.; Huang M.; Yang B.; Ma H.-Y.
发表日期	2020
ISSN	23973722
卷号	3 期号:1
英文摘要	A vast number of weather forecast and climate models have a common warm-and-dry bias, accompanied by the underestimation of evapotranspiration and overestimation of surface net radiation, over the central United States during boreal summer. Various theories have been proposed to explain these biases, but no studies have linked the biases with the missing representation of human perturbations, such as irrigation. Here we argue that neglecting the impact of irrigation contributes to the longstanding warm surface temperature and lack of precipitation biases over this region. By using convection-permitting multi-season simulations over the contiguous United States coupled with an operational-like irrigation scheme, we show that irrigation increases surface evapotranspiration and decreases surface temperature by increasing evaporative fraction. By increasing the frequency of mesoscale convective systems, irrigation reduces the summertime model precipitation deficit and improves the simulated precipitation diurnal cycle over the Great Plains. The increased precipitation also alleviates the warm bias in our simulation setup, likely by damping the positive feedback between soil moisture and temperature. © 2020, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
语种	英语
scopus关键词	diurnal variation; evapotranspiration; irrigation; precipitation (climatology); soil moisture; soil temperature; summer; surface temperature; Great Plains; United States
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178032
作者单位	Pacific Northwest National Laboratory, Richland, WA, United States; School of Atmospheric Sciences, Nanjing University, Nanjing, China; Lawrence Livermore National Laboratory, Livermore, CA, United States
推荐引用方式 GB/T 7714	Qian Y.,Yang Z.,Feng Z.,et al. Neglecting irrigation contributes to the simulated summertime warm-and-dry bias in the central United States[J],2020,3(1).
APA	Qian Y..,Yang Z..,Feng Z..,Liu Y..,Gustafson W.I..,...&Ma H.-Y..(2020).Neglecting irrigation contributes to the simulated summertime warm-and-dry bias in the central United States.npj Climate and Atmospheric Science,3(1).
MLA	Qian Y.,et al."Neglecting irrigation contributes to the simulated summertime warm-and-dry bias in the central United States".npj Climate and Atmospheric Science 3.1(2020).