Arid
DOI10.1038/s41467-017-02021-1
Observed positive vegetation-rainfall feedbacks in the Sahel dominated by a moisture recycling mechanism
Yu, Yan1,2; Notaro, Michael1; Wang, Fuyao1; Mao, Jiafu3,4; Shi, Xiaoying3,4; Wei, Yaxing3,4
通讯作者Yu, Yan
来源期刊NATURE COMMUNICATIONS
ISSN2041-1723
出版年2017
卷号8
英文摘要

Classic, model-based theory of land-atmosphere interactions across the Sahel promote positive vegetation-rainfall feedbacks dominated by surface albedo mechanism. However, neither the proposed positive vegetation-rainfall feedback nor its underlying albedo mechanism has been convincingly demonstrated using observational data. Here, we present observational evidence for the region’s proposed positive vegetation-rainfall feedback on the seasonal to interannual time scale, and find that it is associated with a moisture recycling mechanism, rather than the classic albedo-based mechanism. Positive anomalies of remotely sensed vegetation greenness across the Sahel during the late and post-monsoon periods favor enhanced evapotranspiration, precipitable water, convective activity and rainfall, indicative of amplified moisture recycling. The identified modest low-level cooling and anomalous atmospheric subsidence in response to positive vegetation greenness anomalies are counter to the responses expected through the classic vegetation-albedo feedback mechanism. The observational analysis further reveals enhanced dust emissions in response to diminished Sahel vegetation growth, potentially contributing to the positive vegetation-rainfall feedback.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000416895400015
WOS关键词WEST-AFRICAN MONSOON ; REGIONAL CLIMATE ; VARIABILITY ; DROUGHT ; PRECIPITATION ; DESERTIFICATION ; SIMULATIONS ; ATMOSPHERE ; DYNAMICS ; NORTHERN
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201223
作者单位1.Univ Wisconsin Madison, Nelson Inst Ctr Climat Res, Madison, WI 53706 USA;
2.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA;
3.Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA;
4.Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN 37831 USA
推荐引用方式
GB/T 7714
Yu, Yan,Notaro, Michael,Wang, Fuyao,et al. Observed positive vegetation-rainfall feedbacks in the Sahel dominated by a moisture recycling mechanism[J],2017,8.
APA Yu, Yan,Notaro, Michael,Wang, Fuyao,Mao, Jiafu,Shi, Xiaoying,&Wei, Yaxing.(2017).Observed positive vegetation-rainfall feedbacks in the Sahel dominated by a moisture recycling mechanism.NATURE COMMUNICATIONS,8.
MLA Yu, Yan,et al."Observed positive vegetation-rainfall feedbacks in the Sahel dominated by a moisture recycling mechanism".NATURE COMMUNICATIONS 8(2017).
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