Relationships between Four Seasonal Rainfall Variability in Nrthern China and Sea Level Pressure Anomalies for the Last Century
Received date: 2003-06-10
Revised date: 2003-07-28
Online published: 2003-12-25
Supported by
National Key Program for Basic Sciences in China, No.G1999043405; Doctorial Project of the Ministry of Education of China, No.20010001052
This paper first deals with the empirical orthogonal function (EOF) expansion using four seasonal rainfall data for 1884-1995 in eastern China from 33 stations. The sea level pressure anomalies (SLPA), then, are used to explain the leading modes of rainfall in northern China from the composite of typical years. The first mode of summer rainfall shows the opposite trends in the central area of the Yellow and the Yangtze river basins related to the coastal areas of South China. More rainfall in the area appeared when the positive SLPA occurred in northeast Asia while a pressure trough in eastern China. For the autumn rainfall, the first three modes show a center in the middle and lower reaches of the Yangtze River, reversed trend between southern and northern China, and between eastern coastal and western areas of China, respectively. These modes are closely linked with circulation patterns, particularly for the autumn third mode that was linked to the circulation in the typhoon season. The central area of the first mode for the winter rainfall is located in the middle reaches of the Yellow River and the Yangtze River. For the first mode its amplitude of interdecadal variability gradually became large in the 20th century. The second mode of winter rainfall shows an opposite relation in signs in northern and southern China. The tendency indicates that the decadal rainfall was above normal for the 1920s-1970s but below normal for recent years in northern China. For the spring rainfall the first mode shows a reversed relation in northern China related to South China. The second mode shows that the rainfall in North China and Northeast China was opposite to other regions and a quasi-30-year oscillation is noted in the series of this mode. The dry trend in northern China has become severe since the 1980s.
QIAN Weihong, LIU Daqing . Relationships between Four Seasonal Rainfall Variability in Nrthern China and Sea Level Pressure Anomalies for the Last Century[J]. Acta Geographica Sinica, 2003 , 58(7s) : 49 -60 . DOI: 10.11821/xb20037s006
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