Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1038/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
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
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 |
推荐引用方式 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. |
条目包含的文件 | ||||||
文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
Frequency of Sahelia(396KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 |
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