南海海温异常对七月份中国气候的影响及数值试验

THE INFLUENCE OF SEA SURFACE TEMPERATURE ANOMALIES FOR THE SOUTH CHINA SEA ON JULY CLIMATE IN CHINA AND THEIR NUMERICAL EXPERIMENTS

通过气候资料分析和GCM数值模拟试验,发现七月份中国雨量距平分布异常与南海海温异常有关。长江流域及黄河以南雨量在海温正距平时比负距平时大,华南地区相反。这种分布特征与海温正距平时西太平洋副高西伸加强、负距平时副高偏东减弱有关。南海海温不但对东边系统(副高)有影响,而且对西边系统(印度季风)也有影响。

With climatological analyses and GCM numerical modelling experiments, an association is found between the anomalous July rainfall distribution in China and sea surface temperature anomalies for the south china sea. There is greater rainfall in the Changjiang River Valley and areas to the south of the Yellow River with positive anomalies than with negative anomalies. A reversed situation occurs for the south of China. The distribution is linked with the fact that the West Pacific Subtropical High advances westward and intensifies with positive SST anomalies while leaving eastward weakened with negative anomalies. SST in the south China sea affects systems to the west (Indian Monsoon) as well as those to the east (Subtropical High).