DOI: 10.1002/2016JD025549
论文题名: Persistent landfalling atmospheric rivers over the west coast of North America
作者: Payne A.E. ; Magnusdottir G.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 22 起始页码: 287
结束页码: 300
语种: 英语
英文关键词: atmospheric rivers
; moisture transport
; persistent events
; west coast
Scopus关键词: atmospheric transport
; data set
; flooding
; hydrological modeling
; jet stream
; model validation
; moisture transfer
; persistence
; potential vorticity
; precipitation (climatology)
; Rossby wave
; thermodynamics
; troposphere
; wave breaking
; North America
; Ananas comosus
英文摘要: Landfalling atmospheric rivers (ARs) are linked to heavy precipitation and extreme flooding, and are well known along the western coast of North America. The hydrological impacts of ARs upon landfall are correlated with their duration and magnitude. In order to improve the forecast of these hydrologically significant landfalling events, a better understanding of how they differ from other landfalling events must be established through an investigation of the mechanisms leading to their development prior to landfall. A subset of persistent landfalling AR events between 30°N and 50°N is identified in 3-hourly Modern-Era Retrospective Analysis for Research and Applications reanalysis and validated against existing data sets. These events are identified as features in the low troposphere with high moisture transport and extended geometry that persist over a limited region of the coastline for longer than 63 h (85th percentile of AR duration). A composite analysis shows that persistent events have distinct thermodynamical and dynamical characteristics compared to all AR events. They are characterized by greater moisture content, suggestive of Pineapple Express-type events, a perturbed upper level jet and anticyclonic overturning of potential vorticity contours associated with anticyclonic Rossby wave breaking. Moreover, the location of the Rossby wave breaking is shifted inland compared to all AR events. Analogue analysis of the 500 hPa geopotential height anomalies is used to find nonpersistent events with similar dynamical characteristics to persistent events. Despite their similarity to persistent events, nonpersistent analogues show very little shift toward longer duration. A comparison of the development of persistent and nonpersistent analogues shows that persistent events have much greater moisture content. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: NA15OAR4310164
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62795
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth System Science, University of California, Irvine, CA, United States
Recommended Citation:
Payne A.E.,Magnusdottir G.. Persistent landfalling atmospheric rivers over the west coast of North America[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)