The relationship between the summer precipitation in the Yangtze River valley and the boreal spring Southern Hemisphere annular mode
The relationship between the summer precipitation in the Yangtze River valley and the boreal spring Southern Hemisphere annular mode
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DOI：
10.1029/2003gl018381
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发表时间：
2003-12
影响因子：
5.2
通讯作者：
S. Nan;Jianping Li
中科院分区：
文献类型：
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作者：
S. Nan;Jianping Li
北半球环形模式（SAM）和第二个夏天（6月至8月）在1951 - 2001年的降水量之间的关系在本研究中进行了统计检查。北方河（Sami）的北方春季指数（Sami）和扬河河中部和下到达的夏季降雨。东亚的异常也与北方春季的北方春季事件有关。 ，特定的湿度和水蒸气通量收敛。长江谷的下部，反之亦然。
The relationship between the boreal spring (April–May) Southern Hemisphere annular mode (SAM) and the following summer (June–August) precipitation in China for the period of 1951–2001 is examined statistically in this study. There is a significantly positive correlation between the boreal spring SAM index (SAMI) and the following summer rainfall in the middle and lower reaches of the Yangtze River. The summer large‐scale atmospheric circulation anomalies over East Asia are also related to the boreal spring SAMI events. A strong SAM in boreal spring is followed by a weakened East Asian summer monsoon, a strengthened and westward expanded western Pacific subtropical high (WPSH), as well as increased ascending vertical velocity, specific humidity and water vapor flux convergence. These situations provide necessary circulation and water vapor conditions for increasing the summer precipitation in the middle and lower reaches of the Yangtze River valley, and vice versa. The boreal spring SAM variation provides a potential valuable signal for predicting the summertime precipitation in the middle and lower reaches of the Yangtze River valley.