DOI: 10.1175/JCLI-D-13-00676.1
Scopus记录号: 2-s2.0-84909606587
论文题名: Simulations of the West African monsoon with a superparameterized climate model. Part I: The seasonal cycle
作者: Mccrary R.R. ; Randall D.A. ; Stan C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 22 起始页码: 8303
结束页码: 8322
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Computer simulation
; Oceanography
; Rain
; Africa
; Cloud resolving model
; Community climate system model
; Coupled general circulation models
; Coupled models
; Intertropical convergence zone
; Monsoons
; Summer monsoon precipitation
; Climate models
; atmosphere-ocean coupling
; climate modeling
; general circulation model
; monsoon
; parameterization
; regional climate
; sea surface temperature
; Atlantic Ocean
; Gulf of Guinea
; West Africa
英文摘要: The West African monsoon seasonal cycle is simulated with two coupled general circulation models: the Community Climate System Model (CCSM), which uses traditional convective parameterizations, and the "superparameterized" CCSM (SP-CCSM), in which the atmospheric parameterizations have been replaced with an embedded cloud-resolving model. Compared to CCSM, SP-CCSM better represents the magnitude and spatial patterns of summer monsoon precipitation over West Africa. Most importantly, the region of maximum precipitation is shifted from the Gulf of Guinea in CCSM (not realistic) to over the continent in SPCCSM. SP-CCSM also develops its own biases-namely, excessive rainfall along the Guinean coast in summer. Biases in rainfall from both models are linked to a misrepresentation of the equatorial Atlantic cold tongue. Warm sea surface temperature (SST) biases are linked to westerly trade wind biases and convection within the intertropical convergence zone. Improved SST biases in SP-CCSM are linked to increased tropospheric warming associated with convection. A weaker-than-observed Saharan heat low is found in both models, which explains why the main band of precipitation does not penetrate as far northward as observed. The latitude-height position of the African easterly jet (AEJ) is comparable to observations in both models, but the meridional temperature and moisture gradients and the strength of the jet are too weak in SP-CCSM and too strong in CCSM. Differences in the AEJ are hypothesized to be influenced by the contrasting representation of African easterly waves in both models; no wave activity is found in CCSM, and strong waves are found in SP-CCSM. © 2014 American Meteorological Society. 资助项目: AGS, Division of Atmospheric and Geospace Sciences
; NCAR, Division of Atmospheric and Geospace Sciences
; NSF, Division of Atmospheric and Geospace Sciences
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51183
Appears in Collections: 气候变化事实与影响
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, VA, United States; Center for Ocean-Land-Atmosphere Studies, Calverton, MD, United States
Recommended Citation:
Mccrary R.R.,Randall D.A.,Stan C.. Simulations of the West African monsoon with a superparameterized climate model. Part I: The seasonal cycle[J]. Journal of Climate,2014-01-01,27(22)