THE INFLUENCE OF THE VARIATIONS OF SNOW COVER IN EURASIA FOR HALF YEARS WINTER ON THE CIRCULATIONS OVER THE EAST ASIA

The relationships between the snow cover anomalies for half years winter and the distributions of circulation for the following half years summer on continuous evolutions have been investigated by using the rotated extended principal component analysis based on the data of the snow cover in Eurasia and the 500 hP a height anomalies field over East Asia for the period 1973 through 1994, and the possible mechanisms are discussed. The results indicate that the low frequence flow patterns with different persistence have been excited by the different dynamic evolutions of the snow cover anomalies in Europe, in Medium Asia, at middle-high latitude in East Asia from the preceding fall, winter to spring. No.relationship betwwen the evolutions of the zonal elongated pattern is found for circulation over subtropical East Asia from spring to fall and the Eurasian snow cover anomelies for the preceding half years winter.