Interdecadal variability in the thermal difference between western and eastern China and its association with rainfall anomalies

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• 作者：Liming Wen ; Xiaoxue Yin and Lian-Tong Zhou
• 关键词：thermal difference ; interdecadal variability ; rainfall
• 刊名：Atmospheric Science Letters
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：17
• 期：5
• 页码：346-352
• 全文大小：1370K
• ISSN：1530-261X

文摘

This study investigated the spring thermal difference between western and eastern China and its association with the rainfall anomalies using station and reanalysis data from 1960 to 2006. The spring thermal difference between western and eastern China underwent an obvious interdecadal shift around 1979. The thermal difference between western and eastern China was small during 1960–1978, which strengthened the southwesterly wind anomalies in line with the thermal wind. This enhanced the East Asian summer monsoon. In addition, the increase in rainfall over North China and decrease in rainfall over the Yangtze River were associated with the strong East Asian summer monsoon. However, during 1979–2006, the thermal difference between western and eastern China was large, which strengthened the northeasterly wind anomalies in line with the thermal wind. This supports the notion of weakened East Asian summer monsoon associated with the decrease in rainfall over North China and increase in rainfall over the Yangtze River.