DOI: 10.1007/s00382-012-1344-x
Scopus记录号: 2-s2.0-84876816813
论文题名: Tropical precipitation regimes and mechanisms of regime transitions: Contrasting two aquaplanet general circulation models
作者: Oueslati B. ; Bellon G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-09-10 起始页码: 2345
结束页码: 2358
语种: 英语
英文关键词: Atmospheric dynamics and feedbacks
; Double ITCZ
; Tropical precipitation regimes
英文摘要: The atmospheric general circulation models ARPEGE-climate and LMDz are used in an aquaplanet configuration to study the response of a zonally symmetric atmosphere to a range of sea surface temperature (SST) forcing. We impose zonally-symmetric SST distributions that are also symmetric about the equator, with varying off-equatorial SST gradients. In both models, we obtain the characteristic inter-tropical convergence zone (ITCZ) splitting that separates two regimes of equilibrium (in terms of precipitations): one with one ITCZ over the equator for large SST gradients in the tropics, and one with a double ITCZ for small tropical SST gradients. Transition between these regimes is mainly driven by changes in the low-level convergence that are forced by the SST gradients. Model-dependent, dry and moist feedbacks intervene to reinforce or weaken the effect of the SST forcing. In ARPEGE, dry advective processes reinforce the SST forcing, while a competition between sensible heat flux and convective cooling provides a complex feedback on the SST forcing in the LMDz. It is suggested that these feedbacks influence the location of the transition in the parameter range. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54981
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作者单位: Centre National de Recherches Météorologiques, CNRS/Météo-France, 42, Avenue Gaspard Coriolis, 31057 Toulouse Cedex 01, France
Recommended Citation:
Oueslati B.,Bellon G.. Tropical precipitation regimes and mechanisms of regime transitions: Contrasting two aquaplanet general circulation models[J]. Climate Dynamics,2013-01-01,40(2017-09-10)