摘要
利用ERAinterim再分析资料和全国160站降水等资料,通过经验正交函数分解、回归分析、合成分析等方法,对我国1979—2012年南方冬末春初降水变异及其环流特征进行分析,结果表明:冬末春初降水主要变异中心位于华南。华南降水偏多时,低层菲律宾海上空存在异常反气旋,在华南上空异常辐合、热带西太平洋异常辐散、赤道中东太平洋异常辐合;高层环流配置则相反。太平洋海温异常信号通过地表热通量作为媒介作用上传到大气,大气环流异常形成的波列通过太平洋-东亚遥相关型的作用影响我国降水。
Using ERA interim reanalysis data and data on precipitation at 160 stations nationwide, and through empirical orthogonal function decomposition, regression analysis, synthesis analysis and other methods, precipitation variation and circulation characteristics of southern China in late winter and early spring from 1979 to 2012 were analyzed. The results show that the main variation centers of precipitation in late winter and early spring are located in south China. There is an anomalous anticyclone in the low level over the Philippine seas and anomalous convergence over south China, anomalous divergence in the western tropical Pacific and anomalous convergence in the equatorial eastern and eastern Pacific. The opposite is true for upper-level circulation configurations. Pacific SST anomaly signals are transported upward to the atmosphere through the medium of surface heat flux, and the wave train formed by atmospheric circulation anomaly influences the precipitation in China through a pattern of Pacific-East Asia telecorrelation.
作者
陈春元
CHEN Chun-yuan(Meteorological Center of Civil Aviation Regulation for Central and Southern China, Guangzhou 510405)
出处
《广东气象》
2019年第5期15-18,共4页
Guangdong Meteorology
关键词
气候学
冬末春初
降水
海温
地表热通量
华南
climatology
late winter and early spring
precipitation
SST
surface heat flux
south China
