1982—83年厄尼诺年夏季大气涡旋活动及其物理量输送特征

本文采用ECMWF/WMO格点资料分析了1982—83厄尔尼诺年夏季北半球大气定常涡旋和瞬变涡旋活动及其动量、热量、水汽的输送特征和静止涡的E—P通量,结果表明:厄尔尼诺事件发生前后,北半球夏季大气涡旋活动有很大差异;厄尔尼诺结束后,北半球大气的定常涡旋活动明显增强,其动量、热量和水汽的向北输送异常加强,结果使太平洋等地热带高层东风减弱,副热带西风急流增强,副热带高压加强,以及东亚等地降水异常增多。本文的研究有助于理解热带海温强烈增暖对出现异常大气环流影响的物理机制。 

THE FEATURE OF ATMOSPHERIC EDDY ACTIVITY AND EDDY FLUXES IN NORTHERN HEMISPHERE DURING THE SUMMER OF 1982-83 EL NINO YEAR

The thesis uses the ECMWF/WMO grid data set to analyze the transient eddy,steady eddy,and their momentum,heat,moisture fluxes,and the Eliassen-Palm flux during the months of July in both 1982 and 1983,revealing the fact that the steady eddy and its northward transports of momentnm,temperature,moisture in the tropospheric atmosphere are anomalously strong in the summer just after the 1982-83 El Nino event. These results can be used to explain the anomalous atmospheric circulation and the summer weather in the middle latitudes and the tropics of the Northern Hemisphere.