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大气科学  2007 

夏季东亚西风急流Rossby波扰动异常与中国降水

DOI: 10.3878/j.issn.1006-9895.2007.04.04

Keywords: 东亚西风急流,Rossby波扰动动能,中国雨型,东亚季风环流

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Abstract:

利用1958~2003年NCAR/NCEP再分析和中国160站月降水资料,探讨沿东亚西风急流Rossby波扰动动能异常对东亚夏季风环流和中国夏季(6~8月)降水的影响及其响应机理。研究发现:(1)夏季东亚西风急流Rossby波扰动动能加强(减弱),东亚西风急流位置偏南(北)、强度偏强(弱)。(2)该扰动动能具有显著的年际和年代际变化特征,1958~1978年处于年代际偏弱阶段,1979~1998年处于年代际偏强阶段。(3)该扰动动能加强(减弱),200hPa辐合区位于30?N以南(以北)西太平洋地区,此时,500hPa西太平洋副热带高压位于30?N以南(以北),850hPa反气旋性距平环流出现在东亚30?N以南(以北)地区,而30?N以北(以南)为气旋性距平环流,东亚热带季风环流加强(减弱),梅雨锋加强(减弱),夏季中国东部降水中间多、南北少(中间少、南北多)。(4)东亚高、中、低层大气环流对高层东亚西风急流Rossby波扰动动能强弱响应由对流层上层散度场及垂直速度场变化完成。

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