| DOI: | 10.1002/2015GL065533
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| 论文题名: | Dust-rainfall feedback in West African Sahel |
| 作者: | Yu K.; D'Odorico P.; Bhattachan A.; Okin G.S.; Evan A.T.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9196
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| EISSN: | 1944-8927
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| 出版年: | 2015
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| 卷: | 42, 期:18 | | 起始页码: | 7563
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| 结束页码: | 7571
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| 语种: | 英语
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| 英文关键词: | dust emissions
; precipitation
; Saharan
; Sahel
; vegetation
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| Scopus关键词: | Precipitation (chemical)
; Solar radiation
; Vegetation
; Wind
; Atmospheric dust
; Dust emission
; Land-atmosphere couplings
; Saharan
; Sahel
; Sensible and latent heat fluxes
; Vegetation control
; Vegetation cover
; Dust
; albedo
; atmospheric pollution
; concentration (composition)
; drought resistance
; dust
; emission
; latent heat flux
; precipitation (climatology)
; rainfall
; sensible heat flux
; solar radiation
; vegetation cover
; Sahara
; Sahel [Sub-Saharan Africa]
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| 英文摘要: | Drought persistence in West African Sahel has often been explained as an effect of positive vegetation-atmosphere feedback associated with surface albedo or the partitioning of solar radiation into sensible and latent heat fluxes. An often overlooked aspect of land-atmosphere coupling results from vegetation controls on dust emissions and the ability of mineral aerosols to suppress precipitation. Here we first consider the case of local (endogenous) dynamics within the Sahel, whereby enhanced dust emissions resulting from a decrease in vegetation partly suppress precipitation, thereby further reducing vegetation cover. We then account for teleconnections between Sahel precipitation and exogenous (i.e., Saharan) dust emissions due to an increase in Saharan wind speed in years of above average Sahel precipitation. We find that in both cases vegetation-climate dynamics may have two stable states, one with low precipitation and high concentration of atmospheric dust and the other with high precipitation and lower levels of atmospheric dust. © 2015 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945207942&doi=10.1002%2f2015GL065533&partnerID=40&md5=691cb84f7c1e8ee3f4f1db8504298b0b
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| Citation statistics: |
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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/8812
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
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| Recommended Citation: | |
Yu K.,D'Odorico P.,Bhattachan A.,et al. Dust-rainfall feedback in West African Sahel[J]. Geophysical Research Letters,2015-01-01,42(18).
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