Heavy Rainfalls in South China and Related Circulation during First GARP Global Experiment Period
第一次全球大气研究计划试验期间华南 前汛期暴雨过程及其环流特征的诊断研究

During the First GARP Global Experiment (FGGE) period of 1979, about three heavy rainfalls occurred in South China In this paper, a diagnostic study is conducted The conclusions are the followings: (1) The heavy rainfalls during FGGE period were the result of the interaction between middle and lower latitude systems Besides the influence of tropical summer monsoon, cold air from middle and higher latitudes also played an important role in the rainfalls (2) The three rainfall processes were related with the activities of fronts In each case, the front corresponded to the frontogenetical area and the heavy rainfall occurred near the front or during front passage (3) Computations show that, Q 1 and Q 2 contributed significantly to these rainfall processes of the area of South China, and the convective condensation heating caused by columns convection also played an important role in the rainfalls (4) Heavy rainfalls in South China are associated closely with monsoon circulations During pre-rainy season in 1979, the South China Sea monsoon pushed northwards three times, three rainfall processes had a direct relationship with these activities (5) The moisture source areas of these rainfall processes are analyzed It should be noticed that not only the Bay of Bengal, but also the South China Sea and the West Pacific are important moisture source areas (6) The analysis of the cloud systems indicates that the meso-scale convective cloud clusters provide very favorable conditions to the occurrence of heavy rainfalls