鄂霍茨克海阻高发展过程的正斜压涡度和涡度拟能的演变特征

用正斜压分解法，对1998年发生在鄂霍茨克海的阻高进行涡度和涡度拟以分析，结果发现：在阻高的不同阶段，正压涡度和正压涡度拟能远大于斜压涡度和斜压涡度拟能且在不同的阶段有着不同的演变过程；在阻塞的酝酿阶段正压和斜压涡度和涡度拟能不稳定增长，且向西南传播；在维持阶段，正压和斜压涡度和涡度拟能的增长达到最大值，阻塞形势建立并维持在阻塞区域内；在消亡阶段，正压涡度和涡度拟能与斜压涡度拟能则呈现出不稳定减少，向东南传播，阻塞崩溃，然后又增长。

FEATURES OF BAROTROPIC/BAROCLINIC VORTICITY AND ENSTROPHY DURING OKHOTSK BLOCKING DEVELOPMENT

This paper analyses barotropic vorticity, barotropic enstrophy, baroclinic vorticity and baroclinic enstrophy of the blocking in Okhotsk in 1998 by the use of barotropic and baroclinic decomposition. The results are as the follows:At the different stages of blocking, barotropic vorticity and enstrophy are far more than baroclinic vorticity and enstrophy, and both have different evolutional feature. At the developing stage, vorticity and enstrophy(including barotropic and baroclinic) increase instably and spread southwestward.At the maintaining stage, vorticity and enstrophy of barotropic and baroclinic reach maximum when blocking has built and stayed at the blocking field.At the decaying stage barotropic vorticity and enstrophy and baroclinic vorticity and enstrophy decrease instably and spread southeastward and the blocking disppeared.