青藏高原热力状况异常特征及其与长江中下游地区夏季降水的关系

本文首先对青藏高原热力状况特征进行统计分析，得出高原下垫面热力状况分布具有复杂性和多样性，除具有整个高原一致性外，还具有南北反相关及东西反相关等异常的热力对比分布型，不同的下垫面热力分布型能够对大气环产生不同的影响。并针对南北反相现象进行成因及持续性分析，青藏高原下垫面热力状况南北反相关分布型与大气环流的异常有关，分析表明青藏高原下垫面热力状况南北反相关分布型与大气环流的异常有关，青藏高原下垫面热力状况异常实际上可能是亚洲冬季风异常活动的结果；而高原下垫面热力异常状况具有较强的持续性，其与后期大气环流存在密切的联系，通过影响亚洲夏季风进而影响我国夏季降水的分布型，即当青藏高原下同前冬热力状况为南侧偏暖（冷），北侧则偏冷（暖）分布时，对应长江中下游地区夏季易偏旱（涝），反之亦然。

FEATURES OF THERMAL PATTERN OF TIBETAN PLATEAU AND ITS RELATIONSHIP OF SUMMER RAINFALL IN THE YANGTZE RIVER BASIN

Based on 1979-1995 monthly 10~200cm soil temperature data,attempt is made to investigate wintertime thermal pattern over the TIP and then its relationship to the summer rainfall in the Yangtze River Basin.With the main conclusions given below: (1)The TIP thermal condition displays pronounced and diversified interannual variation features,which exists uniform,and in some anti-correlation manners as well.Namely,there not only exists anti-correlation between north and south of the highland,but also in east and west.The different anomalous thermal patterns may influence distinctly general circulation and summer rainfall belt in the East Asian. (2)The anti-correlation pattern between north and south is considered,which is under the influence of Asian winter Monsoon,the East and Center Asian cold air develop in an anticorrelation manners,which is responsible for the variation in the thermal regime.The results also show that the thermal anomaly has strong persistence from winter to summer in TIP. (3)Strong correlation exists between the anomaly TIP thermal featrues and the following summer rainfall in the north(south)of TIP,the following summer rainfall in the Yangtze River Basin will increase/decrease,and vice versa.Such correlativity is associated with summer Monsoon anomaly,which may be effected by the anomaly thermal pattern and its strong persistence of the huge highland as a thermal heat lift source.