Arid
DOI10.1038/ngeo1173
Frequency of Sahelian storm initiation enhanced over mesoscale soil-moisture patterns
Taylor, Christopher M.1; Gounou, Amanda2,3; Guichard, Francoise2,3; Harris, Phil P.1; Ellis, Richard J.1; Couvreux, Fleur2,3; De Kauwe, Martin4
通讯作者Taylor, Christopher M.
来源期刊NATURE GEOSCIENCE
ISSN1752-0894
EISSN1752-0908
出版年2011
卷号4期号:7页码:430-433
英文摘要

Evapotranspiration of soil moisture can affect temperature and humidity in the lower atmosphere, and thereby the development of convective rain storms. Climate models have illustrated the importance of soil-moisture-precipitation feedbacks for weekly rainfall totals in semi-arid regions, such as the Sahel(1). However, large variations exist between model feedbacks, and the mechanisms governing the strength and sign of the feedback are uncertain. Here, we use satellite observations of land surface temperatures and convective cloud cover over West Africa-collected during the wet seasons between 2006 and 2010-to determine the impact of soil moisture on rainfall in the Sahel. We show that variations in soil moisture on length scales of approximately 10-40 km exert a strong control on storm initiation-as evidenced by the appearance of convective cloud. The probability of convective initiation is doubled over strong soil-moisture gradients compared with that over uniform soil-moisture conditions. We find that 37% of all storm initiations analysed occurred over the steepest 25% of soil-moisture gradients. We conclude that heterogeneities in soil moisture on scales of tens of kilometres have a pronounced impact on rainfall in the Sahel, and suggest that similar processes may be important throughout the semi-arid tropics.


类型Article
语种英语
国家England ; France ; Australia
收录类别SCI-E
WOS记录号WOS:000292241900012
WOS关键词WEST-AFRICA ; CONVECTIVE SYSTEM ; LIFE-CYCLE ; RAINFALL ; IMPACT ; SCALE ; CLIMATOLOGY ; PRECIPITATION ; VARIABILITY ; SUMMER
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/169756
作者单位1.Ctr Ecol & Hydrol, Wallingford OX10 8BB, Oxon, England;
2.CNRS, CNRM GAME, F-31057 Toulouse, France;
3.Meteo France, F-31057 Toulouse, France;
4.Macquarie Univ, Dept Biol Sci, N Ryde, NSW 2109, Australia
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GB/T 7714
Taylor, Christopher M.,Gounou, Amanda,Guichard, Francoise,et al. Frequency of Sahelian storm initiation enhanced over mesoscale soil-moisture patterns[J],2011,4(7):430-433.
APA Taylor, Christopher M..,Gounou, Amanda.,Guichard, Francoise.,Harris, Phil P..,Ellis, Richard J..,...&De Kauwe, Martin.(2011).Frequency of Sahelian storm initiation enhanced over mesoscale soil-moisture patterns.NATURE GEOSCIENCE,4(7),430-433.
MLA Taylor, Christopher M.,et al."Frequency of Sahelian storm initiation enhanced over mesoscale soil-moisture patterns".NATURE GEOSCIENCE 4.7(2011):430-433.
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