气候变化领域集成服务门户(CCPortal): Characteristics, origins, and impacts of summertime extreme precipitation in the Lake Mead watershed

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DOI	10.1175/JCLI-D-19-0387.1
	Characteristics, origins, and impacts of summertime extreme precipitation in the Lake Mead watershed
	Sierks M.D.; Kalansky J.; Cannon F.; Ralph F.M.
发表日期	2020
ISSN	08948755
起始页码	2663
结束页码	2680
卷号	33 期号:7
英文摘要	The North American monsoon (NAM) is the main driver of summertime climate variability in the U.S. Southwest. Previous studies of the NAM have primarily focused on the Tier I region of the North American Monsoon Experiment (NAME), spanning central-western Mexico, southern Arizona, and New Mexico. This study, however, presents a climatological characterization of summertime precipitation, defined as July-September (JAS), in the Lake Mead watershed, located in the NAME Tier II region. Spatiotemporal variability of JAS rainfall is examined from 1981 to 2016 using gridded precipitation data and the meteorological mechanisms that account for this variability are investigated using reanalyses. The importance of the number of wet days (24-h rainfall ≥1 mm) and extreme rainfall events (95th percentile of wet days) to the total JAS precipitation is examined and shows extreme events playing a larger role in the west and central basin. An investigation into the dynamical drivers of extreme rainfall events indicates that anticyclonic Rossby wave breaking (RWB) in the midlatitude westerlies over the U.S. West Coast is associated with 89% of precipitation events. 10 mm (98th percentile of wet days) over the Lake Mead basin. This is in contrast to the NAME TierI region where easterly upper-level disturbances such as inverted troughs are the dominant driver of extreme precipitation. Due to the synoptic nature of RWB events, corresponding impacts and hazards extend beyond the Lake Mead watershed are relevant for the greater U.S. Southwest. © 2020 American Meteorological Society.
语种	英语
scopus关键词	Atmospheric thermodynamics; Mechanical waves; Rain; Watersheds; Climate variability; Extreme events; Extreme precipitation; Extreme rainfall; North american monsoon experiments; Precipitation data; Precipitation events; Spatiotemporal variability; Lakes; anticyclone; climate change; climate effect; extreme event; precipitation intensity; spatiotemporal analysis; summer; watershed; westerly; Lake Mead; United States
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/178739
作者单位	Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States
推荐引用方式 GB/T 7714	Sierks M.D.,Kalansky J.,Cannon F.,et al. Characteristics, origins, and impacts of summertime extreme precipitation in the Lake Mead watershed[J],2020,33(7).
APA	Sierks M.D.,Kalansky J.,Cannon F.,&Ralph F.M..(2020).Characteristics, origins, and impacts of summertime extreme precipitation in the Lake Mead watershed.Journal of Climate,33(7).
MLA	Sierks M.D.,et al."Characteristics, origins, and impacts of summertime extreme precipitation in the Lake Mead watershed".Journal of Climate 33.7(2020).