DOI: 10.1175/JCLI-D-16-0386.1
Scopus记录号: 2-s2.0-85017515916
论文题名: Linking atmospheric river hydrological impacts on the U.S. West Coast to Rossby wave breaking
作者: Hu H. ; Dominguez F. ; Wang Z. ; Laversa D.A. ; Zhang G. ; Ralph F.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 9 起始页码: 3381
结束页码: 3399
语种: 英语
Scopus关键词: Liquid waves
; Mechanical waves
; Stream flow
; Water vapor
; Eastern north pacific
; Hydrological impacts
; Hydrometeorology
; Integrated water vapors
; Intense precipitation
; Mass fluxes/transport
; Orographic effects
; Wavebreaking
; Oceanography
英文摘要: Atmospheric rivers (ARs) have significant hydrometeorological impacts on the U.S. West Coast. This study presents the connection between the characteristics of large-scale Rossby wave breaking (RWB) over the eastern North Pacific and the regional-scale hydrological impacts associated with landfalling ARs on the U.S. West Coast (36°-49°N). ARs associated with RWB account for two-thirds of the landfalling AR events and >70% of total AR-precipitation in the winter season. The two regimes of RWB-anticyclonic wave breaking (AWB) and cyclonic wave breaking (CWB)-are associated with different directions of the vertically integrated water vapor transport (IVT). AWB-ARs impinge in a more westerly direction on the coast whereas CWB-ARs impinge in a more southwesterly direction. Most of the landfalling ARs along the northwestern coast of the United States (states of Washington and Oregon) are AWB-ARs. Because of their westerly impinging angles when compared to CWB-ARs, AWB-ARs arrive more orthogonally to the western Cascades and more efficiently transform water vapor into precipitation through orographic lift than CWB-ARs. Consequently, AWB-ARs are associated with the most extreme streamflows in the region. Along the southwest coast of the United States (California), the southwesterly impinging angles of CWB-ARs are more orthogonal to the local topography. Furthermore, the southwest coast CWB-ARs have more intense IVT. Consequently, CWB-ARs are associated with the most intense precipitation. As a result, most of the extreme streamflows in southwest coastal basins are associated with CWB-ARs. In summary, depending on the associated RWB type, ARs impinge on the local topography at a different angle and have a different spatial signature of precipitation and streamflow. © 2017 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49689
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Scripps Institution of Oceanography, La Jolla, CA, United States; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
Recommended Citation:
Hu H.,Dominguez F.,Wang Z.,et al. Linking atmospheric river hydrological impacts on the U.S. West Coast to Rossby wave breaking[J]. Journal of Climate,2017-01-01,30(9)