云南省雨季降水量变化的区域特征分析

Regional characteristics of the rainy season precipitation in Yunnan

用EOF,REOF方法对1961-2002年云南省124个测站雨季降水的时空分布、演变规律及各区域的降水特征进行了诊断分析.结果表明：大范围区域降水的一致性是云南雨季降水的主要特征,其次为东、西反向变化以及东南、东北反向变化空间异常分布型态;云南雨季降水存在着7个主要的异常区域：滇中以东区,滇南区,滇西北区,滇中以西区,滇西南区,滇东南区,滇东北区;除滇东南区之外,其他各区在20世纪90年代末期雨季降水都有增多的趋势.

With EOF,REOF,the space-time and regional characteristics of the rainy season precipitation in Yunnan were studied by using the precipitation data during the period 1951—2002 from 125 observational stations.The results show：The whole Yunnan will be wet or dry is the main characteristics of rainy season precipitation,but there are the rainfall anomaly differences between in the east and west,and in the southeast and in the northeast.The precipitation abnormal area can be divided into seven sub regions：middle-east,middle-west,northeast,northwest,southeast,and southwest,south part of Yunnan.The precipitation in each region changes with time,in recent 40 years,the precipitation in southeast of Yunnan are decreasing and those over the other sub regions are increasing.