Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016JD025736 |
Circulation controls on southern African precipitation in coupled models: The role of the Angola Low | |
Munday, Callum; Washington, Richard | |
2017-01-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | In southern Africa, models from the latest Coupled Model Intercomparison Project produce a wide variety of rainfall climatologies. Differences between models in rainfall amount reach 70% in the rainy season (December-February; DJF), and the median model overestimates rainfall by between 15 and 40% throughout the annual cycle. This paper investigates the role of an understudied regional circulation feature, the Angola Low, in differentiating between model estimates of precipitation. In austral spring, the Angola Low is a heat low, driven by strong surface heating whereas in DJF it is more similar to a tropical low and is associated with moist instability. In the austral summer, we find that the simulated strength of the Angola Low is associated with between 40 and 60% of the intermodel variability in model mean rainfall across the subcontinent. The relationship is particularly strong along a northwest, southeast axis aligned from Angola down to the Mozambican Channel. Along this axis, models with stronger Angola Lows simulate enhanced, by up to 50 g kg(-1) ms(-1), northeasterly and northwesterly moisture transport. The enhanced southward moisture flux in models with relatively deep Angola Lows increases the rate of moisture convergence in central areas of the subcontinent and reduces moisture divergence across the Mozambican coast. The results highlight the need to better understand the links between the Angola Low and southern African rainfall and suggest that improving the simulation of the Angola Low can help to constrain model estimates of southern African rainfall. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396116900018 |
WOS关键词 | GLOBAL PRECIPITATION ; SURFACE-TEMPERATURE ; CONVERGENCE ZONE ; RAINFALL ; CLIMATE ; OCEAN ; VARIABILITY ; CMIP5 ; ENSO |
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/32732 |
专题 | 气候变化 |
作者单位 | Univ Oxford, Sch Geog & Environm, Oxford, England |
推荐引用方式 GB/T 7714 | Munday, Callum,Washington, Richard. Circulation controls on southern African precipitation in coupled models: The role of the Angola Low[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(2). |
APA | Munday, Callum,&Washington, Richard.(2017).Circulation controls on southern African precipitation in coupled models: The role of the Angola Low.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(2). |
MLA | Munday, Callum,et al."Circulation controls on southern African precipitation in coupled models: The role of the Angola Low".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.2(2017). |
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