Climate Features and Formation Causes of Autumn Rain over Southwest China

BAI Hu-zhi;DONG Wen-jie

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Plateau Meteorology ›› 2004, Vol. 23 ›› Issue (6) : 884-889.

Climate Features and Formation Causes of Autumn Rain over Southwest China

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Abstract

On the basis of analying the climatic characterstics of autumn rain over Southwest China, the autumn rain index was designed by using the autumn precipitation and rain day numbers, meanwhile, the decompositions of EOF and REOF technique were carried out, and the main effective factors about autumn rain were analyzed.The results showed that the first mode indicates the precipitation trend to the north and to the south over the mid-and-upper reaches of Changjiang River is just oposite.The second load eigenvector fields reflectes the consistency of precipitation over Southwest China.The six climatic zones of autumn rain over Southwest China were respectively divided by REOF technique.The trend of climatic change indicated that there is more rain comparatively over Southwest China in autumn in the periods of from 1960's to early 1970's and 1980's, and for less rain in the periods of mid-and-late 1970's, from middle 1980's to late 1990's, however the autumn rain appeared obviouslyin early 21st centurytoo.Western Pacific subtropical high, trough located at India and Burma, and Baikal trough were the main influence systems of autumn rain over southwest China.If the Baikal trough and India-Burma trough were well-developed and west Pacific subtropical high were strengthened, which would be favorable for more rain over Southwest China in autumn, on the contrary, if the condition was overturned, and then which would resulted in rainless.

Key words

Autumn rain over Sou / Climate character / Empirical orthogonal / Analyses of formatio

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BAI Hu-zhi , DONG Wen-jie. Climate Features and Formation Causes of Autumn Rain over Southwest China. Plateau Meteorology. 2004, 23(6): 884-889

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