春季500毫巴西风指数循环及其与角动量输送和能量变化的关系

THE 500 MB WESTERLY INDEX CYCLE IN SPRING AND ITS RELATIONS WITH THE ANGULAR MOMENTUM TRANSPORT AND ENERGY VARIATION

摘要: 本文使用七年3,4月份北半球500毫巴逐日高度资料,对北半球西风指数循环规律作了相关分析,并对角动量输送和能量变化的波谱作了分析。得出了南、北支西风指数循环的反相关规律及北半球各区指数循环之间的相关规律,角动量辐合总值与指数循环之间明显的中期规律,并探讨了扰动动能波谱与指数循环的关系。与此同时,还考察了上述规律与长江中、下游地区降水过程之间的一些关系。

Abstract: Based on the data of the everyday height of the 500 mb over the northern hemisphere in March and April during seven years, correlation analysis of the northern hemispheric westerly index cycle and spectral analysis of the angular momentum transport and energy variation are carried out. Some empirical results are presented. The results may be used in the study of the precipitation in the middle and lower reaches of the Changjiang River.