【摘要】 利用华南区域65个气象站点1960~2004年的观测数据,采用经验正交函数分解法(EOF)分析了华南夏季降水的时空变化。结果表明:华南中部和西北部是华南夏季降水的两个主要气候变异中心区,华南中部夏季降水具有年代际变化为主的特征,华南西北部夏季降水则具有年际变化为主的特征。华南中部夏季降水的强弱异常变化,与华南上空水汽输送异常而导致该地区垂直积分水汽通量辐合异常密切相关。即华南中部夏季降水强年,该区域上空为明显的水汽通量距平辐合,降水弱年则为水汽通量距平辐散或弱的水汽通量距平辐合。为华南区域夏季降水的气候预测提供一定的参考依据。更多还原

【Abstract】 Using the observation data at 65 stations over southern China,the temporal and spatial variations characteristic of summer precipitation from 1960 to 2004 were studied by EOF analysis.The result shows that two main anomalous variation centers of summer precipitation are respectively located at the central part and the northwestern part of southern China with interdecadal and interannual variation character respectively.The precipitation intensity changes over the central part of the southern China have close relation to the abnormal vapor transport: There is obvious vapor flux convergence(divergence) over this area during the strong(weak) precipitation years.It gives more valuable referential information for summer precipitation forecast of southern China.更多还原