王亚非,宋永加. 1998. 1991年夏东亚阻塞高压形成的诊断分析[J]. 气象学报, 56(2):212-224, doi:10.11676/qxxb1998.020
1991年夏东亚阻塞高压形成的诊断分析
A DIAGNOSTIC ANALYSIS ON THE GROWTH MECHANISM OF THE EAST ASIA BLOCKING HIGH IN 1991
投稿时间:1996-12-03  修订日期:1997-03-25
DOI:10.11676/qxxb1998.020
中文关键词:  阻塞高压  罗斯贝波  天气尺度扰动
英文关键词:Blocking anticyclone  Rossby wave  Synoptic disturbance
基金项目:气候中心开放实验室1996年度开放课题
作者单位
王亚非 国家气候中心开放试验室, 北京, 100081 
宋永加 国家气候中心开放试验室, 北京, 100081 
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中文摘要:
      文中将1991年夏季在东亚地区发生的阻塞高压分为发展期,旺盛期及衰亡期等3个阶段进行了细致的诊断分析。发现在东亚阻塞高压的第一、二阶段其上游有明显的波活动通量与2~6d尺度的E矢量通量传播。即定常罗斯贝波的传播与天气尺度扰动的共同作用有利于东亚阻塞高压的维持。第一阶段西风气流的分支处有比第二阶段更为明显的南北向分布的涡动位势涡度的辐散辐合偶极子说明了天气尺度扰动给阻塞高压的发展提供了很重要的能源,显然天气尺度扰动在阻塞高压的发展阶段起着比旺盛阶段更为显着的作用。本文还注意到乌拉尔阻塞高压的崩溃与东亚阻塞高压形成的某些联系。
英文摘要:
      The whole period of the blocking anticyclone occurring in East Asia in the summer of 1991 is divided into three parts which include developing stage, maintained stage and degenerated stager espectively. The East Asia blocking high We analy zed with related diagnostic tools in detail. There are obvious stationary Rossby wave propagation and 2~6 day stransienteddy propagation upstream of the East Asia blocking high in the first and second stages, which means both kind of propagation play animport antrole in increasing and keeping energy of the blocking high. There is more obvious diverg enceconverg ence, north-south dipole of V'q' near westerly split point in the first stage than that in the second stage. This shows that synoptic disturbance can provide more energy source for developing the blocking high. It is worth noticing that there are some relationship between the collapsing of another blocking high around Ural Mountains and the fo rmation of the East Asia blocking high just downst ream of it.
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