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DOI	10.1007/s00382-018-4123-5
	Contribution of large-scale midlatitude disturbances to hourly precipitation extremes in the United States
	Barbero R.; Abatzoglou J.T.; Fowler H.J.
发表日期	2019
ISSN	0930-7575
起始页码	197
结束页码	208
卷号	52 期号:2020-01-02
英文摘要	Midlatitude synoptic weather regimes account for a substantial portion of annual precipitation accumulation as well as multi-day precipitation extremes across parts of the United States (US). However, little attention has been devoted to understanding how synoptic-scale patterns contribute to hourly precipitation extremes. A majority of 1-h annual maximum precipitation (AMP) across the western US were found to be linked to two coherent midlatitude synoptic patterns: disturbances propagating along the jet stream, and cutoff upper-level lows. The influence of these two patterns on 1-h AMP varies geographically. Over 95% of 1-h AMP along the western coastal US were coincident with progressive midlatitude waves embedded within the jet stream, while over 30% of 1-h AMP across the interior western US were coincident with cutoff lows. Between 30–60% of 1-h AMP were coincident with the jet stream across the Ohio River Valley and southeastern US, whereas a a majority of 1-h AMP over the rest of central and eastern US were not found to be associated with either midlatitude synoptic features. Composite analyses for 1-h AMP days coincident to cutoff lows and jet stream show that an anomalous moisture flux and upper-level dynamics are responsible for initiating instability and setting up an environment conducive to 1-h AMP events. While hourly precipitation extremes are generally thought to be purely convective in nature, this study shows that large-scale dynamics and baroclinic disturbances may also contribute to precipitation extremes on sub-daily timescales. © 2018, The Author(s).
英文关键词	Cutoff lows; Hourly precipitation extremes; Jet stream; Synoptic patterns; United-States
语种	英语
scopus关键词	baroclinic motion; disturbance; extreme event; jet stream; midlatitude environment; precipitation intensity; synoptic meteorology; timescale; Ohio Valley [Pennsylvania-Ohio]; United States
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/146633
作者单位	School of Engineering, Newcastle University, Newcastle-upon-Tyne, United Kingdom; Irstea, Mediterranean Ecosystems and Risks, Aix-en-Provence, France; Department of Geography, University of Idaho, Moscow, ID, United States
推荐引用方式 GB/T 7714	Barbero R.,Abatzoglou J.T.,Fowler H.J.. Contribution of large-scale midlatitude disturbances to hourly precipitation extremes in the United States[J],2019,52(2020-01-02).
APA	Barbero R.,Abatzoglou J.T.,&Fowler H.J..(2019).Contribution of large-scale midlatitude disturbances to hourly precipitation extremes in the United States.Climate Dynamics,52(2020-01-02).
MLA	Barbero R.,et al."Contribution of large-scale midlatitude disturbances to hourly precipitation extremes in the United States".Climate Dynamics 52.2020-01-02(2019).