Scopus记录号: 2-s2.0-85042586996
论文题名: Contribution of large-scale midlatitude disturbances to hourly precipitation extremes in the United States
作者: Barbero R. ; Abatzoglou J.T. ; Fowler H.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2019
卷: 52, 期: 2019-01-02 起始页码: 197
结束页码: 208
语种: 英语
英文关键词: Cutoff lows
; Hourly precipitation extremes
; Jet stream
; Synoptic patterns
; United-States
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). 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122476
Appears in Collections: 气候变化事实与影响
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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
Recommended Citation:
Barbero R.,Abatzoglou J.T.,Fowler H.J.. Contribution of large-scale midlatitude disturbances to hourly precipitation extremes in the United States[J]. Climate Dynamics,2019-01-01,52(2019-01-02)