气候变化领域集成服务门户(CCPortal): Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska

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DOI	10.1029/2019JD031823
	Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska
	Sharma A.R.; Déry S.J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:9
英文摘要	Lying in the frontline of the prevailing midlatitude westerlies, British Columbia and southeastern Alaska (BCSAK) often receive copious amounts of precipitation through atmospheric rivers (ARs). This study quantifies the contribution of ARs to annual, seasonal, and extreme precipitation across BCSAK from 1979 to 2012 using a recently developed high-resolution gridded precipitation data set, a regional AR catalog, and integrated vapor transport fields calculated from a reanalysis data set. On average, ARs contribute 13% of total annual precipitation with the higher contribution along the coastal regions (up to 33%), parts of which are one of the wettest locations on Earth, followed by the Columbia and Rocky Mountains (~9%–15%). The highest contributions occur during September (up to 57%) and October (up to 49%). The contribution of ARs to extreme precipitation attains >90% along the western arc of the Coast Mountains and the coastal regions of BCSAK. ARs act as the main synoptic-scale mechanism that brings rainfall to the Rocky Mountains in winter. The probability of observing AR-related precipitation increases over the study period; however, no change occurs in the average AR-related precipitation amount for most of BCSAK during 1979–2012. This work provides insights on the critical role ARs play on the water resources of northwestern North America and has broader implications on community water supply and management, hydropower operations, and flood risk assessment and mitigation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric rivers; British Columbia; extreme precipitation; precipitation; southeastern Alaska
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/186023
作者单位	Natural Resources and Environmental Studies Program, University of Northern British Columbia, Prince George, BC, Canada; Environmental Science and Engineering Program, University of Northern British Columbia, Prince George, BC, Canada
推荐引用方式 GB/T 7714	Sharma A.R.,Déry S.J.. Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska[J],2020,125(9).
APA	Sharma A.R.,&Déry S.J..(2020).Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska.Journal of Geophysical Research: Atmospheres,125(9).
MLA	Sharma A.R.,et al."Contribution of Atmospheric Rivers to Annual, Seasonal, and Extreme Precipitation Across British Columbia and Southeastern Alaska".Journal of Geophysical Research: Atmospheres 125.9(2020).