气候变化领域集成服务门户(CCPortal): Influences of atmospheric rivers on north pacific winter precipitation: Climatology and dependence on ENSO condition

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DOI	10.1175/JCLI-D-20-0301.1
	Influences of atmospheric rivers on north pacific winter precipitation: Climatology and dependence on ENSO condition
	Xiong Y.; Ren X.
发表日期	2021
ISSN	0894-8755
起始页码	277
结束页码	292
卷号	34 期号:1
英文摘要	The atmospheric river (AR) is a unique mover of moisture from the low latitudes to mid- and high latitudes and a potential cause for regional flooding. This study explores the ARs' influence on wintertime precipitation (including extreme precipitation) over the pan-North Pacific during 1996-2018 from the climatological perspective and during the ENSO condition, via distinguishing precipitation and moisture transport between the AR-group and the non-AR-group. Climatologically, the AR-group contributes 30%-45% of total winter precipitation, and up to 70% of total extreme precipitation over the eastern Pacific and along the North American west coast between 258 and 458N. The above area is the core region of the ARs' influence on precipitation. The AR-group's precipitation in the core region is mostly determined by AR-produced in situ moisture convergence, while the non-AR-group's precipitation is attributed to evaporation from Earth's surface. The AR frequency is increased (decreased) in the core region during El Niño (La Niña) winters. As a result, the AR-group contributes more than half of the positive (negative) anomalies in total precipitation in the core region, due to AR-related moisture convergence anomalies. Besides, during El Niño winters, the AR-group also contributes almost half of negative anomalies in total precipitation over the middle basin between 408 and 558N. An anomalous moisture sink (source) always acts to increase (decrease) in situ precipitation for both the AR-group and the non-AR-group. It is also shown that the moisture transport and its divergence anomalies are primarily decided by changes in wind fields and second by moisture. Furthermore, changes in moisture can cause asymmetric features of anomalies in moisture transport and its divergence between El Niño and La Niña but with limited effects. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Precipitation (meteorology); Earth's surface; Eastern pacific; Extreme precipitation; In-situ precipitation; Moisture convergence; Moisture transport; Total precipitation; Winter precipitation; Moisture; annual variation; atmospheric moisture; climatology; El Nino-Southern Oscillation; extreme event; precipitation (climatology); water vapor; winter; Pacific Ocean; Pacific Ocean (North)
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/170974
作者单位	CMA-NJU Joint Laboratory for Climate Prediction Studies, Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, China
推荐引用方式 GB/T 7714	Xiong Y.,Ren X.. Influences of atmospheric rivers on north pacific winter precipitation: Climatology and dependence on ENSO condition[J],2021,34(1).
APA	Xiong Y.,&Ren X..(2021).Influences of atmospheric rivers on north pacific winter precipitation: Climatology and dependence on ENSO condition.Journal of Climate,34(1).
MLA	Xiong Y.,et al."Influences of atmospheric rivers on north pacific winter precipitation: Climatology and dependence on ENSO condition".Journal of Climate 34.1(2021).