Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4315-z |
Understanding the summertime diurnal cycle of precipitation over sub-Saharan West Africa: regions with daytime rainfall peaks in the absence of significant topographic features | |
Vizy, Edward K.; Cook, Kerry H. | |
2019-03-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:2903-2922 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Convection-permitting regional model output is analyzed to better understand the diurnal cycle of rainfall during the height of the West African summer monsoon. This investigation focuses on two regions, the western Bodele of Chad and eastern Burkina Faso, that have a propensity for daytime rainfall, but why this occurs does not conform to our conventional understanding of being directly associated with the presence of significant topographic feature(s). The August diurnal cycle of rainfall for the Bodele is characterized by an afternoon peak, with mesoscale convective systems (MCSs) originating within 500km accounting for 80% of the afternoon precipitation. These MCSs are associated with a deepening of the monsoon trough over the western Sahara related to northern storm track African easterly wave (AEW) disturbance activity, combined with anomalous ridging over eastern Chad associated with cold pool outflow from convection that originates over the Marra Mountains the previous afternoon. These circulation features enhance the moist low-level southwesterly flow and increase instability over the Bodele. Over Burkina Faso rainfall has a primary afternoon peak, and a secondary morning peak. MCSs account for 95% of the total rainfall. Morning rainfall is primarily due to MCSs forming over the Damergou Gap of Niger, while the afternoon rainfall is associated with MCSs that originate over the Damergou Gap as well as locally. While both types of MCSs are associated with an approaching southern storm track AEW disturbance, it is differences in northern storm track activity that helps explain why some MCSs originate over the Damergou Gap. |
英文关键词 | Diurnal cycle of precipitation West Africa Sahel Mesoscale convective system Cold pool outflow MCS genesis African easterly wave disturbance African easterly jet Inter-tropical front Convection permitting modeling |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000463842700023 |
WOS关键词 | MESOSCALE CONVECTIVE COMPLEXES ; WARM-SEASON RAINFALL ; EASTERLY WAVES ; SQUALL-LINE ; PART II ; SPATIOTEMPORAL VARIABILITY ; GLOBAL PRECIPITATION ; PASSIVE MICROWAVE ; DEEP CONVECTION ; SYSTEM |
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/181432 |
专题 | 气候变化 |
作者单位 | Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Vizy, Edward K.,Cook, Kerry H.. Understanding the summertime diurnal cycle of precipitation over sub-Saharan West Africa: regions with daytime rainfall peaks in the absence of significant topographic features[J]. CLIMATE DYNAMICS,2019,52:2903-2922. |
APA | Vizy, Edward K.,&Cook, Kerry H..(2019).Understanding the summertime diurnal cycle of precipitation over sub-Saharan West Africa: regions with daytime rainfall peaks in the absence of significant topographic features.CLIMATE DYNAMICS,52,2903-2922. |
MLA | Vizy, Edward K.,et al."Understanding the summertime diurnal cycle of precipitation over sub-Saharan West Africa: regions with daytime rainfall peaks in the absence of significant topographic features".CLIMATE DYNAMICS 52(2019):2903-2922. |
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