南海地区潜热输送与我国东南部夏季降水的遥相关分析

Teleconnection between latent heat flux over the South China Sea and precipitation of Southeast China in summer

使用奇异值分解（ＳＶＤ）和经验正交函数展开（ＥＯＦ）方法，分析了我国东南部夏季降水与前期（冬季、春季）及同期（夏季）南海潜热输送之间相关场的分布型，从中找出遥相关的“关键区”，并对找到的高相关区的可靠性进行了讨论．结果表明，我国东南部夏季降水与前期（冬季、春季）及同期（夏季）南海潜热输送相关密切，尤其春、夏季潜热输送与降水相关程度更高．前期中的冬季，南海北部潜热输送与华南及其近海地区的夏季降水有较显著的负相关关系；春季，南海中部海盆地带的游热输送与长江以南至华南沿海地区的夏季降水有较强的正相关关系；夏季，南海中部海盆地带仍是影响同期华南降水的“关键区”．

The distribution patterns of correlation between the summer precipitation in the Southeast China and the latent heat flux(LHF)over the South China Sea(SCS) in the preceding winter, spring and simultaneous summer are analyzed by use of the singular value decomposition(SVD) and the empirical orthogonal function(EOF), the 'key regions'are found from the distribution patterns, the reliability of the high correlation regions are discussed. The results show that there exists close relationship between the summer precipitation in the Southeast China and the LHF over the SCS, especially the higher correlation between the LHF in the preceding spring and the simultaneous summer and the precipitation. There is apparent negative correlation between the LHF over the northern SCS in the preceding winter and the summer precipitation in South China and its coastal regions. In spring a strong positive correlation between the LHF over the middle SCS and the precipitation in the area from the south of the Changjiang River to South China coastal regions is found. In summer, the 'key region'still exists over the middle SCS and has influence on precipitation in the corresponding period.