| DOI: | 10.3354/cr01350
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| Scopus记录号: | 2-s2.0-84958729334
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| 论文题名: | Climatic determinants of March-May rainfall variability over southeastern Ethiopia |
| 作者: | Jury M.R.
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| 刊名: | Climate Research
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| ISSN: | 0936577X
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| 出版年: | 2015
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| 卷: | 66, 期:3 | | 起始页码: | 201
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| 结束页码: | 210
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| 语种: | 英语
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| 英文关键词: | Climate prediction
; Ethiopia
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| Scopus关键词: | climate prediction
; monsoon
; oceanic circulation
; precipitation assessment
; regional climate
; temporal variation
; upwelling
; wet season
; Atlantic Ocean
; Atlantic Ocean (East)
; Benguela Current
; East African Rift
; Ethiopian Rift
; Gulf of Guinea
; Indian Ocean
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| 英文摘要: | Ethiopia southeast of the Rift Valley has 2 wet seasons in boreal spring and autumn. Mar-May rains were statistically analyzed and related to the regional climate. Mean easterly flow from the warm (29°C) southern Indian Ocean rises over the east African escarpment, but convection must overcome the shallow Hadley circulation and dry layer above 600 hPa. Correlation maps at 5 mo lead time contribute 3 predictors to a multivariate algorithm that accounts for 55% of Mar-May rainfall variability. The predictors represent trigger points that suggest a reduction in convection over the east Atlantic Ocean and an increase over the west Indian Ocean. Together, these opposing centers of action alter the circulation and extent of the central African monsoon. Composites of extreme wet and dry seasons reveal the tropical South Atlantic zonal overturning ocean circulation as a determinant of SE Ethiopian Mar-May rainfall. When upwelling strengthens in the Benguela Current, the cold plume sweeps into the Gulf of Guinea, damping convection there. This sets up a velocity potential gradient across the central African monsoon, causing it to expand toward the Rift Valley. © Inter-Research 2015. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/116448
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| Appears in Collections: | 气候减缓与适应
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| Recommended Citation: | |
Jury M.R.. Climatic determinants of March-May rainfall variability over southeastern Ethiopia[J]. Climate Research,2015-01-01,66(3)
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