1998年青藏高原大气低频振荡的结构特征分析
投稿时间:2000-01-13  修订日期:2000-06-13  点此下载全文
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作者单位
徐国强 南京气象学院大气科学系, 南京 210044 
朱乾根 南京气象学院大气科学系, 南京 210044 
基金项目:国家科技部攀登项目B:“青藏高原地气物理过程及其对全球气候和中国旱涝灾害影响的观测和理论研究”
中文摘要:使用NCEP/NCAR再分析资料,研究了1998年夏季青藏高原大气低频振荡的结构特征。结果表明:不同低频频率的遥相关水平结构既有相似的波列结构,也存在相异的特征。高原主体的低频振荡为相当正压结构,低频降水一般位于低频气旋性环流及低频气流辐合带内,利用高原低频降水可提前预测江南及高原南部的低频降水活动,高原和长江中下游及东北地区的低频降水存在同时加强和同时减弱的关系。
中文关键词:青藏高原  低频振荡  遥相关  低频降水
 
Analysis of features of atmospheric LFO structures over the Tibetan plateau in 1998
Abstract:WT5BZ]In the context of NCEP/NCAR reanalysis daily data in 1998, this paper investigates the features of LFO (low frequency oscillation) structure over the Tibetan Plateau in the summer of 1998.Results show that teleconnection horizontal structures of different low frequencies(LF) have similar wave trains though they exist discrepancy features.LFO structure of principal part of the Plateau is of equivalent barotropic structure.LFP(low frequency precipitation) is generally located at LF cyclonic circulation or LF flow convergence belt.Activities of LFP of south of the Yangtze River and south of the Plateau can be foreshadowed with LFP of the Plateau.LFP strengthens or weakens simultaneously in the Tibetan Plateau and at the low/mid Yangtze Reaches as well as in northeast China.
keywords:Tibetan Plateau  LFO  teleconnection  low frequency precipitation
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