DOI: 10.1175/JCLI-D-12-00339.1
Scopus记录号: 2-s2.0-84877664191
论文题名: Asian monsoon forcing of subtropical easterlies in the community atmosphere model: Summer climate implications for the western atlantic
作者: Kelly P. ; Mapes B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 9 起始页码: 2741
结束页码: 2755
语种: 英语
Scopus关键词: Asian summer monsoons
; Balkan peninsulas
; Community atmosphere model
; Mean zonal winds
; Modeling results
; Near-surface winds
; Observational analysis
; Western Atlantic
; Atmospheric thermodynamics
; Ocean currents
; Transport properties
; Tropics
; Climate models
; anticyclone
; atmospheric modeling
; climate forcing
; drought
; easterly wave
; monsoon
; Rossby wave
; wave propagation
; zonal wind
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (Subtropical)
; Atlantic Ocean (West)
; Balkans
; China
; Xizang
英文摘要: The effects of a progressively enhanced Asian summer monsoon on the mean zonal wind are examined in a series of experiments using the Community Atmosphere Model version 4 (CAM4). The response of the barotropic mean zonal wind varies in a linear fashion with the forcings of 5, 10, and 20 W m22 in net radiation over South Asia. The authors increase the strength of the monsoon by making the South Asian land surface hotter (via lower soil albedo). This leads to an enhanced Rossby wave source region over the Balkan Peninsula at 458N, northwest of the upper-level Tibetan high (TH). Equatorward propagation of Rossby waves causes stationary eddy momentumflux divergence (SEMFD) to the south of this source region. This local area of SEMFD produces easterly tendencies of the barotropic part of the mean zonal wind in the subtropics. As the easterly mean flow strengthens, so do low-level easterlies across the subtropical Atlantic, leading to a westward displacement of the North Atlantic subtropical high (NASH) on its equatorward flank. The western intensification of theNASH causes drying in the west Atlantic and neighboring land masses primarily because of near-surface wind divergence in the anticyclone. These modeling results confirm the mechanisms deduced in the authors' recent observational analysis of the mean seasonal cycle's midsummer drought. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51900
Appears in Collections: 气候变化事实与影响
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作者单位: University of Miami, Miami, FL, United States
Recommended Citation:
Kelly P.,Mapes B.. Asian monsoon forcing of subtropical easterlies in the community atmosphere model: Summer climate implications for the western atlantic[J]. Journal of Climate,2013-01-01,26(9)