青藏高原冬季OLR年际变化特征及其与我国夏季降水的联系

WINTER QINGHAI XIZANG PLATEAU OLR INTERANNUAL VARIATIONAL FEATURES AND THEIR RELATION TO CHINA SUMMER RAINFALL

根据NOAA卫星观测的 1 979～ 1 994年OLR资料 ,对青藏高原全区冬季 (1～3月 )OLR年际变化特征进行了EOF分析 ,并研究了它与冬、夏 50 0hPa高度场及夏季降水的关系。结果发现 ,高原冬季OLR的分布型与冬季冷空气的路径、强度和范围有密切关系。高原冬季OLR的异常与其后我国夏季降水及 50 0hPa高度场也有很好的对应关系 ,冬季高原北部偏冷(暖 )时 ,夏季我国黄河南部—华南、黑龙江降水偏多 (少 ) ,华北一带降水偏少 (多 ) ;西南部偏冷 (暖 )时 ,夏季我国 1 1 0°E以东地区出现降水偏多 (少 ) ,东北和西南地区降水偏少 (多 ) ;冬季高原西部暖 (冷 )东部冷 (暖 )时 ,夏季江淮一带少 (多 )雨 ,东南沿海和华北多 (少 )雨。

WT5BZ]Based on 1979～1994 OLR data from NOAA satellite, interannual variation feature of Qinghai Xizang Plateau winter OLR was analysed by EOFs, and then its relation to 500 hPa height field and summer rainfall. The results show that winter Plateau OLR anomaly has the close relation to the path, strengthen and region of winter 500 hPa cold surge. Also the winter Plateau OLR has a good relation to summer convection is well, that is, when the North Plateau is colder(warmer)in winter, heavier(lighter)rainfall will be in the regions from Yellow River to South China and Heilongjiang river, while lighter(heavier)rainfall in the North China in summer; when the SW Plateau is colder(warmer), in summer heavier(lighter)rainfall will be in the East China while lighter(heavier)in the NE and SW China; when the East Plateau is colder(warmer)and the West warmer(colder), In summer heavier(lighter)rainfall will be in Changjiang valley while lighter(heavier)in the North China and SE coast.[WT5HZ]