气候变化领域集成服务门户(CCPortal): Changes in atmospheric rivers and moisture transport over the Northeast Pacific and western North America in response to ENSO diversity

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DOI	10.1007/s00382-017-3598-9
	Changes in atmospheric rivers and moisture transport over the Northeast Pacific and western North America in response to ENSO diversity
	Kim H.-M.; Zhou Y.; Alexander M.A.
发表日期	2019
ISSN	0930-7575
起始页码	7375
结束页码	7388
卷号	52 期号:12
英文摘要	The year-to-year changes in atmospheric rivers (ARs) and moisture transport over the northeast Pacific and western North America are investigated during December to February (DJF) from 1979/80 to 2015/16. Changes in AR frequency, intensity, and landfall characteristics are compared between three ENSO phases: central Pacific El Niño (CPEN), eastern Pacific El Niño (EPEN), and La Niña (NINA). During EPEN events, the subtropical jet extends to the south and east with an anomalous cyclonic flow around a deeper Aleutian Low. More moisture is transported towards North America and AR frequency is increased over western North America. In CPEN events, the Aleutian low shifts further southward relative to its position in EPEN, resulting in an increase in the frequency and intensity of landfalling ARs over the southwestern US. In NINA events, the landfalling AR frequency is reduced associated with anomalous anticyclonic circulation over the eastern North Pacific. We diagnose the contribution of multiple factors to the seasonal mean moisture transport using moisture budgets. During the three ENSO phases, the change in low-frequency circulation (dynamical process) is the leading contributor to the seasonal mean moisture flux divergence, while the contributions of the synoptic anomalies and the change in moisture anomaly (thermodynamic process) are not significant along the west coast of North America. © 2017, Springer-Verlag Berlin Heidelberg.
语种	英语
scopus关键词	annual variation; atmospheric circulation; El Nino-Southern Oscillation; La Nina; moisture transfer; thermodynamics; North America; Pacific Ocean; Pacific Ocean (Northeast)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146282
作者单位	School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794, United States; NOAA/Earth System Research Laboratory, Boulder, CO, United States
推荐引用方式 GB/T 7714	Kim H.-M.,Zhou Y.,Alexander M.A.. Changes in atmospheric rivers and moisture transport over the Northeast Pacific and western North America in response to ENSO diversity[J],2019,52(12).
APA	Kim H.-M.,Zhou Y.,&Alexander M.A..(2019).Changes in atmospheric rivers and moisture transport over the Northeast Pacific and western North America in response to ENSO diversity.Climate Dynamics,52(12).
MLA	Kim H.-M.,et al."Changes in atmospheric rivers and moisture transport over the Northeast Pacific and western North America in response to ENSO diversity".Climate Dynamics 52.12(2019).