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DOI | 10.1175/JCLI-D-16-0134.1 |
Saharan Heat Low Biases in CMIP5 Models | |
Dixon, Ross D.1,2; Daloz, Anne Sophie1,2; Vimont, Daniel J.1,2; Biasutti, Michela3 | |
2017-04-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399679900009 |
WOS关键词 | WEST-AFRICAN MONSOON ; SAHEL RAINFALL VARIABILITY ; EARTH SYSTEM MODEL ; INTRASEASONAL VARIABILITY ; BASIC EVALUATION ; NORTH-ATLANTIC ; COUPLED MODEL ; EASTERLY JET ; CLIMATE ; DYNAMICS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19808 |
专题 | 气候变化 |
作者单位 | 1.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA; 2.Univ Wisconsin, Nelson Inst Ctr Climat Res, Madison, WI 53706 USA; 3.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA |
推荐引用方式 GB/T 7714 | Dixon, Ross D.,Daloz, Anne Sophie,Vimont, Daniel J.,et al. Saharan Heat Low Biases in CMIP5 Models[J]. JOURNAL OF CLIMATE,2017,30(8). |
APA | Dixon, Ross D.,Daloz, Anne Sophie,Vimont, Daniel J.,&Biasutti, Michela.(2017).Saharan Heat Low Biases in CMIP5 Models.JOURNAL OF CLIMATE,30(8). |
MLA | Dixon, Ross D.,et al."Saharan Heat Low Biases in CMIP5 Models".JOURNAL OF CLIMATE 30.8(2017). |
条目包含的文件 | 条目无相关文件。 |
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