%0 Journal Article
%T Potential Vorticity Analysis of Cold Air Activities during the East Asian Summer Monsoon<br>东亚夏季风时期冷空气活动的位涡分析
%A ZHAO Liang
%A DING Yihui
%A <br>赵亮
%A 丁一汇
%J 大气科学
%D 2009
%I 
%X Using multi-scale analysis,several indicators of cold air activities during the East Asian summer monsoon (EASM) are compared,and the results show that potential vorticity (PV) is the optimal indicator in tracing cold air activities during EASM. The further study shows that it is best that the low-frequency oscillations of PV (20-80 day and 40-80 day oscillations) represent cold air activities. Then,the source and role of cold air during EASM are studied by use of the indicator,and the process and mechanism...
%K potential vorticity
%K the East Asian summer monsoon
%K cold air
%K Meiyu<br>位涡
%K 东亚夏季风
%K 冷空气
%K 梅雨
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=46874A5A102033D774D00D819E91CD68&aid=EE2C403A43E4C431DC5E149CE36F6576&yid=DE12191FBD62783C&vid=27746BCEEE58E9DC&iid=0B39A22176CE99FB&sid=3356A7630A93A219&eid=5F8BAECF36EB55E2&journal_id=1006-9895&journal_name=大气科学&referenced_num=3&reference_num=29