DOI: 10.1175/JCLI-D-16-0134.1
Scopus记录号: 2-s2.0-85017113616
论文题名: Saharan heat low biases in CMIP5 models
作者: Dixon R.D. ; Daloz A.S. ; Vimont D.J. ; Biasutti M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 8 起始页码: 2867
结束页码: 2884
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Climate change
; Climatology
; Oceanography
; Surface waters
; Africa
; African easterly waves
; Coupled Model Intercomparison Project
; Global climate model
; Monsoons
; Sea surface temperatures
; Tropical precipitation
; West African Monsoon
; Climate models
英文摘要: Representing the West African monsoon (WAM) is a major challenge in climate modeling because of the complex interaction between local and large-scale mechanisms. This study focuses on the representation of a key aspect of West African climate, namely the Saharan heat low (SHL), in 22 global climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) multimodel dataset. Comparison of the CMIP5 simulations with reanalyses shows large biases in the strength and location of the mean SHL. CMIP5 models tend to develop weaker climatological heat lows than the reanalyses and place them too far southwest. Models that place the climatological heat low farther to the north produce more mean precipitation across the Sahel, while models that place the heat low farther to the east produce stronger African easterly wave (AEW) activity. These mean-state biases are seen in model ensembles with both coupled and fixed sea surface temperatures (SSTs). The importance of SSTs on West African climate variability is well documented, but this research suggests SSTs are secondary to atmospheric biases for understanding the climatological SHL bias. SHL biases are correlated across the models to local radiative terms, large-scale tropical precipitation, and large-scale pressure and wind across the Atlantic, suggesting that local mechanisms that control the SHL may be connected to climate model biases at a much larger scale. © 2017 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
; NSF, Norsk Sykepleierforbund
; NSF, Norsk Sykepleierforbund
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49707
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 Wisconsin-Madison, Madison, WI, United States; Nelson Institute Center for Climatic Research, University of Wisconsin-Madison, Madison, WI, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Dixon R.D.,Daloz A.S.,Vimont D.J.,et al. Saharan heat low biases in CMIP5 models[J]. Journal of Climate,2017-01-01,30(8)