Relationships between Eurasian Teleconnection Pattern in Northern Hemisphere Autumn and Autumn rainfall in West China
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Abstract:
The relationship between autumn rainfall in West China and autumn Eurasian teleconnection pattern (EUa) is examined by using the EOF, correlation and composite analysis and so on. The results show that significant negative correlation is found between autumn rainfall in West China and autumn EUa index, both with the phasic and jumping characteristics. The correlation coefficient of both oscillated significantly before 1986, and the significantly related areas mainly concentrated in the southwest Sichuan basin and Guizhou. The correlation coefficient increased significantly after 1986; the significantly related regions moved northward; the obviously correlated areas mainly concentrated in the northeastern Sichuan basin, Chongqing, and southern Shanxi. In the positive anomaly phase of EUa, the insufficient water vapor supply gave rise to the recession of the rainfall. In the negative anomaly phase of EUa, the rainfall amount of the eastern part of the autumn rainfall area increased, while the western shows the opposite reaction.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.