METEOROLOGICAL CHARACTERISTICS DURING THE SECOND MEIYU EPISODE IN 1998

作     者：张雁 马强 加藤内藏进 

作者机构：National Meteorological CenterBeijing 100081China Okayama UniversityJapan 

出 版 物：《Acta meteorologica Sinica》 (气象学报(英文版))

年 卷 期：2002年第16卷第3期

页      面：282-292页

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：National Natural Science Foundation of China under Grant No.49794030 

主　　题：second Meiyu episode circulation feature large-scale system 

摘      要：This article examined the meteorological features of the second Meiyu/Baiu episode(hereafter Meiyu Ⅱ)in 1998 and the results are summarized as follows:(1)The Meiyu Ⅱ period in 1998 has been the longest and the most delayed ending one since 1885,which caused the great flood around the Yangtze River *** circulation situation in Meiyu Ⅱ is so typical that the average geopotential height and wind fields at 500 hPa and 850 hPa are very similar to monthly mean in *** abnormal circulation in Meiyu Ⅱ is associated with an adjusting of the Okhotsk high and short period south-north oscillation of the subtropical high.(2)The heavy rainfall around the Yangtze River during Meiyu Ⅱ period is closely related to a persistent shear line,a clear eastward moving vortex structure and a very strong jet flow at lower *** is very clear that the strong divergence at higher levels and convergence at lower levels occurred in situ during Meiyu Ⅱ period. (3)It is very clear that the convective activity propagates eastward quickly with a period about 7 days during Meiyu Ⅱ period.