投稿时间:2006-12-31  修订日期:2007-04-11  点此下载全文
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朱艳峰 中国气象局, 气候研究开放实验室, 北京, 100081 
陈德亮 中国气象局, 气候研究开放实验室, 北京, 100081
哥德堡大学, 地球科学系, 瑞典, 哥德堡, 40530 
李维京 中国气象局, 气候研究开放实验室, 北京, 100081 
张培群 中国气象局, 气候研究开放实验室, 北京, 100081 
中文关键词:Lamb-Jenkinson方法  环流分型  气候变化  中国
Lamb-Jenkinson Circulation Type Classification System and Its Application in China
Abstract:In this study,the Lamb-Jenkinson circulation type classification system is applied to obtain circulation information in China on daily basis.For that purpose,the NCEP daily mean sea-level pressure reanalysis data from 1 January 1948 to 31 December 2004 are used to derive daily six circulation indices and corresponding 27 circulation types for 16 sub-regions in China.The frequency of circulation types over different sub-regions and seasons is computed and described.Results show that Lamb-Jenkinson classification system is applicable for most of China,although in the west of China where might exist some errors in sea-level pressure due to high elevation.Linear tendencies of three major indices(zonal wind,meridional wind and vorticity) from 1958 to 2004 has been analyzed.Since 1958,all of three indices have obviously decreased over North China,Hetao and central-western Nei Mengolia,which indicates that high value systems have increased and quasi-eostrophic southwest wind has decreased over these regions.It is possibly an important circulation background for droughts over above regions.For the wintertime,zonal wind index has distinctively increased over Northeast China,North China and the north of Xinjiang,suggesting that the westerly in the ground layer has strengthened over the north of China,which is closely related with remarkable warming over above areas in winter.
keywords:Lamb-Jenkinson classification system  circulation type  climate change  China
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