气候变化领域集成服务门户(CCPortal): Drought Demise Attribution Over CONUS

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DOI	10.1029/2019JD031255
	Drought Demise Attribution Over CONUS
	Wu J.; Dirmeyer P.A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:4
英文摘要	Compared with drought onset, the quantification and attribution of drought demise are not well studied. Meteorological droughts usually terminate more rapidly than they initiate, making it hard to define a transition period leading to drought demise with monthly data. In this study, methods of quantifying and attributing drought demise are applied to the Modern-Era Retrospective Analysis for Research and Applications version 2 (MERRA-2) using modified Standardized Precipitation Index representing meteorological drought calculated at pentad intervals to resolve subseasonal demise events. Methodologies to attribute three specific causes of drought demise in nine climate regional divisions over conterminous U.S. (CONUS) are developed. The three phenomenological causes are tropical cyclones, atmospheric rivers, and changes in land atmospheric feedback. Atmospheric river is the most common of the factors for drought demise, over most of the regions in the eastern, and central U.S. tropical cyclones are important causes over the Southwest, the South in fall, and the Southeast in summer. Evolving land atmospheric feedback is a factor mainly over the central and southwestern United States. These attributions estimated may not be representative of the long-term climatologies of drought demise due to the short duration of MERRA-2. A representativeness test is conducted for estimating the three impacts on drought demise using subsamples from a large ensemble of climate model simulation including several centuries of data. Thirty to forty years is not long enough to be representative of local long-term statistics for the attribution of the causes of demise of extreme events like drought but may be adequate at regional scales. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186159
作者单位	Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA, United States; Center for Ocean-Land-Atmosphere Studies, Fairfax, VA, United States
推荐引用方式 GB/T 7714	Wu J.,Dirmeyer P.A.. Drought Demise Attribution Over CONUS[J],2020,125(4).
APA	Wu J.,&Dirmeyer P.A..(2020).Drought Demise Attribution Over CONUS.Journal of Geophysical Research: Atmospheres,125(4).
MLA	Wu J.,et al."Drought Demise Attribution Over CONUS".Journal of Geophysical Research: Atmospheres 125.4(2020).