%0 Journal Article
%T On the Seasonal Variation of Atmospheric General Circulation and the Monsoon<br>大气环流的季节变化和季风
%A Zeng Qingcun
%A Zhang Banglin
%A <br>曾庆存
%A 张邦林
%J 大气科学
%D 1998
%I 
%X By using the global wind data for 1980-1991, the seasonality, difined as the root mean squared of the difference between summer and winter (or the January and July) and divided by the climatological annual mean, has been calculated. It is discovered that in the lower troposphere there are five regions with pronounced large seasonality: one is located in the tropical zone, two in subtropical zones (one in the Northern Hemisphere and one in the Southern Hemisphere), two in middle-high latitudes (one in each hemisphere). They are respectively coincident with the classically tropical monsoon region, regions accupied by the seasonal migration of subtropical high over Pacific, Atlantic and Indian Ocean, and regions associated with the storm tracks of westerly line. Therefore, they can be called the tropical monsoon region, (two) subtropical monsoon regions, and (two) middle-high latitude monsoon regions respectively. Second, the seasonality possesses baroclinity in the vertical structure: in the lower traposphere the tropical monsoon and subtropical monsoon are two separable systems (although connected to some extent), but the subtropical monsoon is shifted to the low latitudes in the vertical and eventually combined with the tropical monsoon as a whole nonseparable planetary monsoon system which possesses some cross-equator component of wind, and there exists in the middle-upper stratosphere one zone in each (Northern/Southern) Hemisphere with very pronounced large seasonality in the middle latitudes and is associated with the maintainence and breaking down of the night jet stream. Besides, some other problems such as the division of seasons, the spatical-temporal structure of their onset times and the interannual variabilities are also discussed in the paper.
%K seasonality
%K season
%K monsoon
%K interannual variability<br>季节变率
%K 季节
%K 季风
%K 年际变化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=46874A5A102033D774D00D819E91CD68&aid=FFA72C7420EDF28F&yid=8CAA3A429E3EA654&vid=BC12EA701C895178&iid=B31275AF3241DB2D&sid=8C8D39B86A1EED4F&eid=FCB110411B6339D8&journal_id=1006-9895&journal_name=大气科学&referenced_num=41&reference_num=7