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ON THE RELATIONSHIP BETWEEN 100-hPa SOUTH ASIA HIGH AND MEI-YU IN JIANGSU PROVINCE

Journal of Tropical Meteorology 2011年第3期17卷 302-309页

作者：刘梅裴海瑛俞剑蔚胡洛林 Jiangsu Meteorological Observatory Nanjing Meteorological Bureau

By analyzing the change of an index for the characteristics of South Asia High and variations of upper-air troughs in 2002–2005,we studied the impact of South Asia high on the beginning and ending of the Mei-yu(*** rain corresponding to the ripening season of plum)in Jiangsu *** verification is conducted on the relationships between the index and the Mei-yu season in 1991–2005 to examine the impacts of the SAH characteristics index on a rain intensity index of Mei-yu and regional distribution of a characteristics index for different annual patterns of *** composite is performed of the 100-hPa circulation field for these patterns using the 100-hPa geopotential height of Northern Hemisphere from 2002 to 2005 and 45-year NCEP reanalysis to study the difference in the circulation for different patterns of *** and statistic conclusions,which share much in common,have been obtained as follows.(1)The characteristics preceding to and the advancement/retreat of SAH and the movement of westerly troughs are the factors that influence the onset time of the Mei-yu season;after the Mei-yu onset,the progression/withdrawal of SAH and how farther east it extends are determining how long the Mei-yu lasts and when it ends.(2)During the Mei-yu,the general 100-hPa circulation situation and average characteristics of the SAH are well corresponding to the characteristics of the season and annual patterns of *** addition,the averages of the SAH ridgeline and east-extending index for June,July and the Mei-yu season have some implications to the forecast of the index of Mei-yu *** conclusions can be served as powerful means in determining the starting/ending dates, duration and annual pattern of the Mei-yu season.

关键词： South Asia High characteristics index Mei-yu in Jiangsu province

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