DOI: 10.1007/s00382-017-3838-z
Scopus记录号: 2-s2.0-85026528897
论文题名: The relationship between tropical precipitation biases and the Saharan heat low bias in CMIP5 models
作者: Dixon R.D. ; Vimont D.J. ; Daloz A.S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-09-10 起始页码: 3729
结束页码: 3744
语种: 英语
英文关键词: Atlantic ITCZ
; Climate modeling
; Saharan heat low
; West Africa monsoon
Scopus关键词: climate modeling
; CMIP
; computer simulation
; heat flow
; intertropical convergence zone
; numerical model
; precipitation (climatology)
; tropical meteorology
; Sahel [Sub-Saharan Africa]
英文摘要: This study focuses on the relationship in global climate models between three features: the Saharan Heat Low (SHL), Sahel precipitation, and the Atlantic Intertropical Convergence Zone (ITCZ). Previous work showed that both coupled (CMIP) and uncoupled (AMIP) ocean/atmosphere models that place the SHL farther to the north are associated with increased precipitation across the Sahel. Further, the northward SHL placement is also associated with a northward shift in the Atlantic ITCZ in coupled CMIP models, but an eastward shift in uncoupled AMIP models. We perform three experiments with the Community Earth System Model to better understand relationships between these features. We find that when a northward-shifted Atlantic ITCZ is locally forced, there is no coherent response in the SHL and Sahel precipitation. However, when a northward-shifted Atlantic ITCZ is forced by altering the cross equatorial energy transport, the SHL shifts northward and Sahel precipitation increases, consistent with model biases. Finally, when the SHL strength is forced directly, there is a weak but robust increase in Sahel precipitation and a northward shift in the Atlantic ITCZ. The results of these experiments emphasize the important role of global scale energy biases on the simulation of West African climate, and show a possible feedback from West African climate onto the Atlantic ITCZ. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109335
Appears in Collections: 影响、适应和脆弱性 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, United States; Nelson Institute, Center for Climatic Research, University of Wisconsin-Madison, Madison, United States; Centre National de Recherches Météorologiques (CNRM), UMR 3589, CNRS, Météo-France, Toulouse, France; Space Science and Engineering Center, University of Wisconsin-Madison, Madison, United States
Recommended Citation:
Dixon R.D.,Vimont D.J.,Daloz A.S.. The relationship between tropical precipitation biases and the Saharan heat low bias in CMIP5 models[J]. Climate Dynamics,2018-01-01,50(2018-09-10)