DOI: 10.1007/s00382-012-1561-3
Scopus记录号: 2-s2.0-84868151337
论文题名: Impact of the configuration of stretching and ocean-atmosphere coupling on tropical cyclone activity in the variable-resolution GCM ARPEGE
作者: Daloz A.S. ; Chauvin F. ; Roux F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 2017-09-10 起始页码: 2343
结束页码: 2359
语种: 英语
英文关键词: African easterly wave (AEW)
; Frequency of coupling
; General circulation model (GCM)
; Ocean-atmosphere coupling
; Stretched
; Tropical cyclone (TC)
英文摘要: This study starts by investigating the impact of the configuration of the variable-resolution atmospheric grid on tropical cyclone (TC) activity. The French atmospheric general circulation model ARPEGE, the grid of which is rotated and stretched over the North Atlantic basin, was used with prescribed sea surface temperatures. The study clearly shows that changing the position of the stretching pole strongly modifies the representation of TC activity over the North Atlantic basin. A pole in the centre of the North Atlantic basin provides the best representation of the TC activity for this region. In a second part, the variable-resolution climate model ARPEGE is coupled with the European oceanic global climate model NEMO in order to study the impact of ocean-atmosphere coupling on TC activity over the North Atlantic basin. Two pre-industrial runs, a coupled simulation and a simulation forced by the sea surface temperatures from the coupled one, are compared. The results show that the coupled simulation is more active in the Caribbean Sea and the Gulf of Mexico while the forced simulation is more active over eastern Florida and the eastern Atlantic. The difference in the distribution of TC activity is certainly linked with the location of TC genesis. In the forced simulation, tropical cyclogenesis is closer to the west African coast than in the coupled simulation. Moreover, the difference in TC activity over the eastern Atlantic seems to be related to two different mechanisms: the difference in African easterly wave activity over the west of Africa and the cooling produced, in the coupled simulation, by African easterly waves over the eastern Atlantic. Finally, the last part studies the impact of changing the frequency of ocean-atmosphere coupling on Atlantic TC activity. Increasing the frequency of coupling decreases the density of TC activity over the North Atlantic basin. However, it does not modify the spatial distribution of the TC activity. TC rainfalls are decreased by 8 % in the high frequency coupled run. © 2012 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55092
Appears in Collections: 过去全球变化的重建
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作者单位: Groupe de Modélisation Grande Echelle et Climat, CNRM-GAME, 42 avenue G. Coriolis, 31057 Toulouse Cedex 1, France; Laboratoire d'Aérologie, Centre National de la Recherche Scientifique, Université de Toulouse, Toulouse, France
Recommended Citation:
Daloz A.S.,Chauvin F.,Roux F.. Impact of the configuration of stretching and ocean-atmosphere coupling on tropical cyclone activity in the variable-resolution GCM ARPEGE[J]. Climate Dynamics,2012-01-01,39(2017-09-10)