DOI: 10.1175/JCLI-D-13-00017.1
Scopus记录号: 2-s2.0-84892510151
论文题名: Interhemispheric teleconnections from tropical heat sources in intermediate and simple models
作者: Ji X. ; Neelin J.D. ; Lee S.K. ; Mechoso C.R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 2 起始页码: 684
结束页码: 697
语种: 英语
Scopus关键词: Circulation models
; Precipitation anomalies
; Simple modeling
; Teleconnection patterns
; Teleconnections
; Two-level models
; Vertical advection
; Vertical motions
; Advection
; Drag
; Shear flow
; Tropics
; barotropic wave
; equatorial wave
; heat source
; heating
; precipitation (climatology)
; Rossby wave
; teleconnection
; thermomechanics
; warm pool
英文摘要: Themechanisms that control the interhemispheric teleconnections fromtropical heat sources are investigated using an intermediate complexitymodel [a quasi-equilibriumtropical circulation model (QTCM)] and a simple linear two-level model with dry dynamics. Illustrating the interhemispheric teleconnection process with an Atlantic warm pool principal case, the heat source directly excites a baroclinic response that spreads across the equator. Then, three processes involving baroclinic-barotropic interactions-shear advection, surface drag, and vertical advection-force a cross-equatorial barotropic Rossby wave response.An analysis of these processes in QTCM simulations indicates that 1) shear advection has a pattern that roughly coincides with the baroclinic signal in the tropics and subtropics, 2) surface drag has large amplitude and spatial extent and can be very effective in forcing barotropicmotions around the globe, and 3) vertical advection has a significant contribution locally and remotely where large vertical motions and vertical shear occur. The simple model is modified to perform experiments in which each of these three mechanisms may be included or omitted. By adding surface drag and vertical advection, and comparing each to shear advection, the effects of the three mechanisms on the generation and propagation of the barotropicRossbywaves are shown to be qualitatively similar to the results in QTCM. It is also found that the moist processes included in the QTCM can feed back on the teleconnection process and alter the teleconnection pattern by enlarging the prescribed tropical heating in both intensity and geographical extent and by inducing remote precipitation anomalies by interaction with the basic state. © 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51446
Appears in Collections: 气候变化事实与影响
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作者单位: Department of atmospheric and oceanic sciences, University of california, Los Angeles, Los Angeles, CA, United States; Cooperative institute for marine and atmospheric studies, University of Miami, NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States
Recommended Citation:
Ji X.,Neelin J.D.,Lee S.K.,et al. Interhemispheric teleconnections from tropical heat sources in intermediate and simple models[J]. Journal of Climate,2014-01-01,27(2)