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中文摘要: 对1999年上海地区入梅早、出梅迟、梅雨期长、梅雨量超历史纪录的环流特征和原因作了初步统计分析，其中分别讨论了西太平洋副热带高压强度及脊线位置、东亚夏季风强度指数及爆发迟早、低纬热带地区对流活动、台风的频数及移动路径等天气气候因素与1999年上海地区梅雨异常的关系，结果表明：1999年副热带高压强度偏弱、主体位置偏南、偏东，东亚夏季风爆发早、强度指数偏弱，ITCZ(赤道辐合带)不活跃，台风频数少且多北上转向路径等都是造成上海地区梅雨异常的因素。
中文关键词: 梅雨，副热带高压，夏季风，赤道辐合带
Abstract:The circulation features and its formation cause in Shanghai in 1999 were investigated,including mei-yu quantity,mei-yu period,the beginning and ending of mei-yu,and its relationship with the subtropical high,East Asian summer monsoon intensity index,the convective activity in tropical zone and typhoon were discussed.The results show that the intensity of subtropical high is weaker,the ridge line of subtropical high is leaning to south and east,the East Asian summer monsoon intensity index is weaker and begins earlier,ITCZ is not active,typhoon sums are less,and they are the formation factors of the mei yu anomaly in Shanghai in 1999.
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引用文本：
姚建群,张家澄,陈永林,2000.1999年上海梅雨异常的环流特征及其成因[J].气象,26(9):31-35.
,2000.The Circulation Features and its Formation Cause of the Meiyu Anomaly in Shanghai in 1999[J].Meteor Mon,26(9):31-35.
姚建群,张家澄,陈永林,2000.1999年上海梅雨异常的环流特征及其成因[J].气象,26(9):31-35.
,2000.The Circulation Features and its Formation Cause of the Meiyu Anomaly in Shanghai in 1999[J].Meteor Mon,26(9):31-35.