The spring soil moisture and the summer rainfall in eastern China
The spring soil moisture and the summer rainfall in eastern China
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DOI：
10.1007/s11434-007-0442-3
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发表时间：
2007-12
影响因子：
--
通讯作者：
Z. Zuo;Renhe Zhang
中科院分区：
文献类型：
--
作者：
Z. Zuo;Renhe Zhang
研究了我国东部地区春季土壤湿度与夏季降水的关系。结果表明，华北至长江下游地区春季土壤湿度与我国东部夏季降水有密切关系。当春季华北地区土壤湿度距平为正时，夏季降水在东北和长江下游地区表现为正距平，在华南和华北地区表现为负距平。北半球较高的土壤湿度降低了陆面温度，减小了海陆温度梯度，减弱了东亚夏季风。西太平洋副热带高压偏南向西移，导致长江下游降水偏多，华南、华北降水偏少。
The relation between the soil moisture in spring and the rainfall in summer in eastern China is investigated. Results show that the summer rainfall in eastern China is closely related to the spring soil moisture in the area from North China to the lower reaches of Yangtze River (NCYR). When spring soil moisture anomalies over NCYR are positive, the summer precipitation exhibits positive anomalies in Northeast China and the lower reaches of Yangtze River, and negative anomalies in southern China and North China. The higher soil moisture over NCYR cools land surface and reduces the land-sea temperature gradient, which weakens East Asian summer monsoon. The western Pacific Subtropical High (WPSH) is located to the south and shifts westward, resulting in more rainfall in the lower reaches of Yangtze River and less in southern China and North China.