%0 Journal Article
%T Mechanism of Thermal Features over the Indo-China Peninsula and Possible Effects on the Onset of the South China Sea Monsoon<br>中南半岛地区热力特征对南海季风爆发的可能影响及机理
%A Zhang Yaocun
%A Qian Yongfu
%A <br>Zhang Yaocun
%A Qian Yongfu
%J 大气科学进展
%D 2002
%I 
%X The thermal characteristics during the South China Sea (SCS) summer monsoon onset period near theIndo-China Peninsula are analyzed by using the South China Sea Monsoon Experiment (SCSMEX)reanalysis data from I May to 31 August 1998 and the NCEP/NCAR pentad-mean reanalysis data fromJanuary 1980 to December 1995. The possible relationships between the anomaly of thermal features nearthe Indo-China Peninsula and the SCS monsoon onset are investigated, and the mechanism causing theSCS summer monsoon onset is also discussed. Results from the 1998 SCSMEX reanalysis data show thatthere exists a strong persistent surface sensible heating near the Indo-China Peninsula prior to the SCSmonsoon onset, which has apparent low frequency oscillation features. This sensible heating leads to awarmer center in the lower atmosphere near the Indo-China Peninsula and strong local horizontal tempera-ture and geopotential height gradients which are favorable to strengthening the southwest wind over theIndo-China Peninsula. It is also found that stronger convergent winds at lower levels and stronger divergentwinds at high levels appear, which provide a favorable configuration for the development of vertical motion,enhancement of precipitation, and onset of the SCS monsoon. These results can be verified by analysis of themulti-year mean data. Additionally, it is found that the temperature at 850 hPa increases more rapidly overthe Indo-China Peninsula than the South China Sea prior to the SCS monsoon onset, which leads to astrengthening of the temperature difference between the Indo-China Peninsula and the South China Sea.Moreover, results from the analysis of the Iongitudinal temperature and geopotential height differencesshow that the eastern retreat of the subtropical high over the Indo-China Peninsula during the period ofSCS monsoon onset is associated with the temperature increase over the Indo-China Peninsula and theeastern extension of low trough over the Bay of Bengal.
%K Indo-China Peninsula
%K thermal teature
%K mechanism of SCS monsoon onset<br>中南半岛
%K 热力特征
%K 南海季风爆发机制
%K 低频振荡
%K 水平温度梯度
%K 位势高度梯度
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=5434AFBF6CB6E7E8D67733B541F211C7&aid=8E3A982D819AF72754431CB1B1EC8F92&yid=C3ACC247184A22C1&vid=2A8D03AD8076A2E3&iid=94C357A881DFC066&sid=745C7FAEA69986C7&eid=F3FF3E69C64937E9&journal_id=0256-1530&journal_name=大气科学进展&referenced_num=9&reference_num=19