华南前汛期(4~6月)降水异常特征及其与我国近海海温的关系

ON THE RELATIONSHIP BETWEEN PRECIPITATION ANOMALIESIN THE FIRST RAINING SEASON(APRIL-JUNE) IN SOUTHERNCHINA AND SST OVER OFFSHORE WATERS IN CHINA

分析了华南前汛期降水异常，认为华南前汛期降水峰值所在月有明显的年际变化。前汛期总的降水变化趋势不明显。前汛期降水异常存在多尺度振荡，前汛期降水偏多年，偏少年的同期全国降水分布存在明显相反的特征，且通过对华南前汛期降水异常与其前期（上一年6－8月）我国近海SSTA的相关分布，找到一个稳定的影响华南前汛期降水的敏感海区，同时讨论了它的敏感时段及其同期的SSTA，后期的距平环流场特征与华南前汛期降水异常，同期的距平环流场特征的关系，最后分析了该敏感海区SSTA与全球海域SSTA的关系，由此提出一个我国近海SSTA影响华南前汛期降水异常的可能机制。

Analyze the precipitation anomaly of South of China's early flood period, we know the rain peak month of South of China's early flood period has obvious decade change. The change of total precipitation of South of China's early flood period is not obviously. There have many scale oscillations in the precipitation anomaly of South of China's early flood period. The China rain distribution character between more precipitation year and less precipitation year of South of China's early flood period is contrast. And through repeat calculate the correlation between precipitation anomaly of South of China's early flood period and ahead period' s (last June-August) SSTA of China' s neighboring seas, we find a sensitive sea area which influences the precipitation of South of China's early flood period steadily, the same time we talk about the sensitive time and the relation between it' s SSTA、character of circulation departure field of following period and the precipitation anomaly of South of China's early flood period、it' s character of circulation departure field, in the end we analyze the relation between SSTA of sensitive sea and SSTA of global sea, then we bring forward a possible mechanism about how the SSTA of China' s neighboring seas influence the precipitation anomaly of South of China's early flood period.