欧亚雪盖准2年振荡对中国降水的影响

The Effect of Biennial Oscillation of Snow Cover in Eurasia on the Rainfall in China

用２２年（１９７３～１９９４年）季平均欧亚大陆雪盖资料和中国降水资料进行主振荡型分析（ＰＯＰ）和伴随相关分析，研究了欧亚雪盖准２年振荡（ＱＢＯ）对中国降水影响的循环过程，结果表明中国降水低频场存在两种不同的伴随相关型，其主要响应区域在西部和长江以南地区，另外，长江下游和东北部分地区也有较显著响应。

The principal oscillation pattern (POP) analysis and associated correlation analysis are performed based on the data of a recent 22-year period (1973～1994), and the cycle evolutions for the effect of biennial oscillations of snow cover in Eurasia on the rainfall in China are investigated Results suggest that there are two kinds of the notable associated correlation patterns and that the dominant response regions of low frequency field of the rainfall appear in the western China and the south of the Yangtze River In addition, there are more stronger response region in northeast China and the low reacher of the Yangtze River It is caused by the anomalies flow patterns excited by uneven heating distribution associated with the intensity of snow cover in Eurasia