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大气科学  2002 

ElNi?o和LaNi?a事件对东亚冬、夏季风循环的影响

DOI: 10.3878/j.issn.1006-9895.2002.05.02

Keywords: ElNi(n)o,LaNi(n)a,东亚冬季风,东亚夏季风,季风循环

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Abstract:

通过合成的ElNiNo和LaNiNa的分析发现,一般一个ElNino或LaNina事件大致可以分成爆发前的冬季、发展期的夏季、盛期时的冬季和衰亡期的夏季四个阶段.在此基础上利用NCEP再分析环流资料和中国降水资料分析了东亚冬、夏季风对E1Nino和LaNina的响应,结果发现,E1Nino和LaNina事件显著地影响了东亚冬、夏季风的循环.E1Nino爆发前的冬季在东亚地区往往有异常强的北风;ElNino发展期的夏季,西太平洋副热带高压偏弱,同时影响我国的西南气流偏弱,从而江淮地区和南方沿海地区多雨,长江中游和华北地区少雨;E1Nino盛期的冬季东亚地区则出现异常的南风;而E1Nino衰亡期的夏季,西太平洋副热带高压偏强,同时影响我国的西南气流偏强,从而江淮地区少雨,华北、东北以及洞庭湖、鄱阳湖地区多雨.LaNina对东亚冬、夏季风循环的影响则与ElNino大致相反,但它的影响不如Elino的影响显著.对强、弱东亚冬季风后的夏季中国降水异常的分析则表明,正是由于与ElNino或LaNina事件有关的海温异常对东亚冬、夏季风循环的影响才导致了东亚冬季风与随后的夏季风存在着紧密的联系;当冬季风异常不是由与ElNiNino或LaNina事件有关的海温异常所引起时,两者之间就缺少显著的联系.

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