DOI: 10.1175/JCLI-D-16-0401.1
Scopus记录号: 2-s2.0-85019158058
论文题名: Mongolian mountains matter most: Impacts of the latitude and height of asian orography on pacific wintertime atmospheric circulation
作者: White R.H. ; Battisti D.S. ; Roe G.H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 11 起始页码: 4065
结束页码: 4082
语种: 英语
Scopus关键词: Atmospheric structure
; Climatology
; Jets
; Mechanical waves
; Meteorology
; Wave propagation
; Atmospheric circulation
; General circulation model
; Large scale motion
; Latitudinal variation
; Northern Hemispheres
; Orographic effects
; Potential vorticity gradients
; Rossby wave
; Landforms
英文摘要: The impacts of Asian orography on the wintertime atmospheric circulation over the Pacific are explored using altered-orography, semi-idealized, general circulation model experiments. The latitude of orography is found to be far more important than height. The Mongolian Plateau and nearby mountain ranges, centered at ~48°N, have an impact on the upper-level wintertime jet stream that is approximately 4 times greater than that of the larger and taller Tibetan Plateau and Himalayas to the south. Key contributing factors to the importance of the Mongolian mountains are latitudinal variations in the meridional potential vorticity gradient and the strength of the impinging wind-both of which determine the amplitude of the atmospheric response-and the structure of the atmosphere, which influences the spatial pattern of the downstream response. Interestingly, while the Mongolian mountains produce a larger response than the Tibetan Plateau in Northern Hemisphere winter, in April-June the response from the Tibetan Plateau predominates. This result holds in two different general circulation models. In experiments with idealized orography, varying the plateau latitude by 20°, from 43° to 63°N, changes the response amplitude by a factor of 2, with a maximum response for orography between 48° and 53°N, comparable to the Mongolian mountains. In these idealized experiments, the latitude of the maximum wintertime jet increase changes by only ~6°. It is proposed that this nearly invariant spatial response pattern is due to variations in the stationary wavenumber with latitude leading to differences in the zonal versus meridional wave propagation. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49633
Appears in Collections: 气候变化事实与影响
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作者单位: Joint Institute for the Study of Atmosphere and Ocean, University of Washington, Seattle, WA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
White R.H.,Battisti D.S.,Roe G.H.. Mongolian mountains matter most: Impacts of the latitude and height of asian orography on pacific wintertime atmospheric circulation[J]. Journal of Climate,2017-01-01,30(11)