摘要
评述了近 34年来 5～ 7月份江淮流域出现的梅雨情况 ,包括非典型梅雨和典型梅雨。资料表明 ,非典型梅雨期一般要比典型梅雨期 (正常梅雨 )短 ,5月份非典型梅雨存有比典型梅雨降雨强度弱的特点 ,6、7月份出现的非典型梅雨期和典型梅雨期同样可以出现较大降雨。研究发现 ,非典型梅雨与典型梅雨的大尺度环流特征有一定的差别。 1 1 0～ 1 30°E副高脊线稳定在 2 0～ 2 5°N之间 ,是江淮流域出现梅雨 (包括非典型梅雨 )的有利条件 ,而不是必要条件。从多年预报服务情况和资料分析来看 ,需制定出更科学合理的梅雨划分标准。
The Meiyu cases, including non-typical and typical Meiyu, occurred in the Changjiang-Huaihe River valley from May to July in last 34 years are reviewed. It shows that the lasting period of non-typical Meiyu is shorter than that of typical (normal) Meiyu, the intensity of precipitation of non-typical Meiyu in May is less than that of typical Meiyu, and the precipitation of non-typical Meiyu in June and July could be the same as that of typical Meiyu. It indicates that there is difference between the large circulation character of non-typical Meiyu and that of typical Meiyu. It is suitable to the occurrence of Meiyu in the valley that the ridge of subtropical high is steadily located in the region of 20—25°N, 110—130°E, but it is not necessary. A more rational standard of Meiyu should be defined according to so many year operation and data analysis.
出处
《气象》
CSCD
北大核心
2004年第11期38-42,共5页
Meteorological Monthly
