气候变化领域集成服务门户(CCPortal): Impacts of storm track variations on wintertime extreme precipitation and moisture budgets over the Ohio Valley and northwestern United States

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DOI	10.1175/JCLI-D-19-0543.1
	Impacts of storm track variations on wintertime extreme precipitation and moisture budgets over the Ohio Valley and northwestern United States
	Ma C.-G.; Chang E.K.M.; Wong S.; Zhang R.; Zhang M.; Del Genio A.
发表日期	2020
ISSN	0894-8755
起始页码	5371
结束页码	5391
卷号	33 期号:13
英文摘要	Previous studies have shown that variations in extratropical cyclone activity significantly affect the frequency of extreme precipitation events over the Ohio Valley and northwestern United States. In this study, we examine the similarities and differences between the dynamics governing these events in these two regions. In the Ohio Valley, extreme precipitation events are associated with midlatitude synoptic-scale convergence northeast of cyclones and a southwestward oriented ridge near the Atlantic coast that drives strong water vapor transport from the Gulf of Mexico into the Ohio Valley. In the northwestern United States, extreme precipitation events are associated with a cyclonic and anticyclonic circulation pair aligned northwest to southeast, which together drive a long and strong moisture transport corridor from the lower latitude of the central Pacific Ocean toward the northwestern United States. Moisture budget analysis shows that moisture convergence due to dynamical convergence dominates in the Ohio Valley, whereas moisture advection dominates over the Pacific Northwest. Differences between the cases in the same region are examined by an empirical orthogonal function (EOF) analysis conducted on the vertically integrated moisture flux. Different EOFs highlight shifts in spatial location, orientation, and intensity of the moisture flux but demonstrate consistent roles of dynamics in the two regions. Composites based on these EOFs highlight the range of likely synoptic scenarios that can give rise to precipitation extremes over these two regions. © 2020 American Meteorological Society.
英文关键词	Budget control; Landforms; Nanofluidics; Orthogonal functions; Precipitation (meteorology); Storms; Anticyclonic circulation; Empirical orthogonal function analysis; Extratropical cyclones; Extreme precipitation; Extreme precipitation events; Northwestern United States; Precipitation extremes; Water vapor transport; Moisture; atmospheric moisture; empirical orthogonal function analysis; extratropical cyclone; extreme event; moisture flux; precipitation (climatology); storm track; synoptic meteorology; water vapor; winter; Atlantic Ocean; California; Gulf of Mexico; Ohio Valley [California]; United States
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171247
作者单位	School of Marine and Atmospheric Sciences, Stony Brook University, State University of New York, Stony Brook, NY, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; NASA Goddard Institute for Space Studies, New York, NY, United States
推荐引用方式 GB/T 7714	Ma C.-G.,Chang E.K.M.,Wong S.,et al. Impacts of storm track variations on wintertime extreme precipitation and moisture budgets over the Ohio Valley and northwestern United States[J],2020,33(13).
APA	Ma C.-G.,Chang E.K.M.,Wong S.,Zhang R.,Zhang M.,&Del Genio A..(2020).Impacts of storm track variations on wintertime extreme precipitation and moisture budgets over the Ohio Valley and northwestern United States.Journal of Climate,33(13).
MLA	Ma C.-G.,et al."Impacts of storm track variations on wintertime extreme precipitation and moisture budgets over the Ohio Valley and northwestern United States".Journal of Climate 33.13(2020).