DOI: 10.1175/JCLI-D-17-0700.1
Scopus记录号: 2-s2.0-85052927387
论文题名: Mechanisms setting the strength of orographic Rossby waves across a wide range of climates in a moist idealized GCM
作者: Wills R.C.J. ; Schneider T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 18 起始页码: 7679
结束页码: 7700
语种: 英语
英文关键词: Atmospheric circulation
; Energy budget/balance
; General circulation models
; Latent heating/cooling
; Orographic effects
; Stationary waves
Scopus关键词: Budget control
; Global warming
; Heating
; Thermal gradients
; Atmospheric circulation
; Energy budget/balance
; General circulation model
; Latent heating/cooling
; Orographic effects
; Stationary waves
; Mechanical waves
英文摘要: Orographic stationary Rossby waves are an important influence on the large-scale circulation of the atmosphere, especially in Northern Hemisphere winter. Changes in stationary waves with global warming have the potential to modify patterns of surface temperature and precipitation. This paper presents an analysis of the forcing of stationary waves by midlatitude orography across a wide range of climates in a moist idealized GCM, where latent heating and transient eddies are allowed to feed back on the stationary-eddy dynamics. The stationary-eddy amplitude depends to leading order on the surface winds impinging on the orography, resulting in different climate change responses for mountains at different latitudes. Latent heating is found to damp orographic stationary waves, whereas transient eddies are found to reinforce them. As the climate warms, the damping by latent heating becomes more effective while the reinforcement by transient eddies becomes less effective, leading to an overall reduction in orographic stationary wave amplitude. These effects overwhelm the influences of a reduced meridional temperature gradient and increased dry static stability, both of which increase the sensitivity of the free troposphere to orographic forcing. Together with a reduction in the midlatitude meridional temperature gradient, the weakening of orographic stationary waves leads to reduced zonal asymmetry of temperature and net precipitation in warm, moist climates. While circulation changes in this idealized model cannot be expected to agree quantitatively with changes in the real world, the key physical processes identified are broadly relevant. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111390
Appears in Collections: 气候减缓与适应
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作者单位: University of Washington, Seattle, WA, United States; California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Wills R.C.J.,Schneider T.. Mechanisms setting the strength of orographic Rossby waves across a wide range of climates in a moist idealized GCM[J]. Journal of Climate,2018-01-01,31(18)