青藏高原热力状况与四川盆地汛期降水的联系

应用高原积雪日数和高原气温、四川盆地逐月降水量资料，应用ＳＶＤ等方法，探讨高原热力状况分布异常与四川盆地汛期降水分布的联系。分析结果表明，高原积雪日数场分布特征是以巴颜喀拉山和念青唐古拉山为中心。该区域冬季积雪日数异常与川中盆地汛期干旱有相当好的联系。春季青藏高原北部和祁连山的温度场的大范围异常则与川西的洪涝和川东的干旱均有较好的相关，均可作为四川降水长期预报综合考虑的重要参考因子。一般而言，积雪

THE RELATIONSHIP BETWEEN THERMAL REGIME IN QINGHAI-XIZANG PLATEAU AND PRECIPITATION IN SICHUAN BASIN DURING FLOOD SEASON

Based on the data set of the perpetualsnow duration and temperature in the Plateau and precipitation in Sichaun Basin. Therelationship between the thermal regime distribution in the Qinghai-Xizang Plateau and theprecipitation in the Sichuan Basin during the flood season was investigated using theSingular Value Decomposition method. The results are as follows the distributioncharacter of the Plateau perpetual snow duration is that the centers are located in theBayanhar mountain and Nyainqêtanglha mountain. The anomaly in these area in winterrelated to the precipitation in the middle part of Sichuan Basin during flood season.There is close relationship between the large extent anomalies of the temperature inQaidam Basin and Qilian mountain and the flooding in the west part and the drought in theeast part of Sichuan Basin. The prepetual snow duration and the temperature in the Plateaushould be consider as the factor of the long forecasting for the precipitation in Sichuan.In general,the period for prepetual snow bring atmospheric circulation and precipitationinto effect is longer than the temperature, because of snow melting and water into thesoil need long time. The August precipitation in Sichuan Basin obviously are affeced bythe snow and temperature in the Qinghai-Xizang Plateau.