热带大气季节内振荡的进一步分析  

A Further Analysis on Intraseasonal Oscillation inthe Tropical Atmosphere

作　　者：李崇银[1] 李桂龙[1] 

机构地区：[1]中国科学院大气物理研究所

出　　处：《气候与环境研究》1998年第1期28-38,共11页Climatic and Environmental Research

基　　金：国家"九五"攀登项目"南海季风试验"及中国科学院KZ951-B1-408-01课题共同资助

摘　　要：利用ＥＣＭＷＦ的格点资料对热带大气季节内振荡作了进一步分析研究，表明热带大气季节内振荡既有Ｋｅｌｖｉｎ波型扰动，也有Ｒｏｓｓｂｙ波型扰动；影响热带大气季节内振荡移动的主要因素有扰动波型和积云对流活动的异常；伴随ＥｌＮｉｎｏ事件的发生，热带大气季节内振荡的动能急剧减小，而准定常扰动动能急剧增大，既反映了热带大气季节内振荡对ＥｌＮｉｎｏ的激发作用，也说明了在ＥｌＮｉｎｏ期间热带大气季节内振荡偏弱的原因。Some analyses on intraseasonal oscillation in the tropical atmosphere are completed by using the ECMWF data. The results show that there are two kinds of the disturbance pattern, Kelvin wave like and Rossby wave like, in tropical intraseasonal oscillation. The disturbance pattern and the anomaly of the cumulus convection are fundamental factors to affect zonal propagation of tropical intraseasonal oscillation. Accompanying the occurrence of El Nio event, the kinetic energy of intraseasonal oscillation in the tropical atmosphere decreases rapidly and the kinetic energy of the quasistationary disturbance increases rapidly, this means the exciting effect of tropical intraseasonal oscillation to El Nio event and represents a cause for weaker intraseasonal oscillation during El Nio event.

关 键 词：热带大气季节内振荡 Kelvin波型 Rosby波型 扰动 

分 类 号：P444[天文地球—大气科学及气象学]