赤道辐合区中多台风期大尺度和台风尺度的动能收支及其相互作用

Kinetic Energy Budgets of Large and Typhoon Scale within the ITCZ during Multitudious Typhoon Period

本文选了两例西太平洋赤道辐合区中同时有3个台风发生发展的多台风过程,采用滤波法分离出大尺度场和台风尺度场,并建立了完整的包括大尺度平均动能、扰动动能,台风尺度的平均动能、扰动动能收支方程,最后做了各种动能收支计算.结果发现:对于这种条件下台风尺度扰动的发展,大尺度动能转换的贡献不足20％,其发展动能主要是从比台风尺度小的短波尺度中获得.也就是说,在热带短波是台风尺度和大尺度的动能源.

This paper selected two multitudious typhoon processes which all had three typhoons appearing and developing almost simultaneously within the ITCZ of Western Pacific. Barnes filtering technique was used to separate large-scale and typhoon-scale field from total field . Then the equations for average and disturbing kinetic energy of large-scale and typhoon-scale were derived theoretically. The last part applied the equations in budget analysis to account for the interactions between large-typhoon scale. The results showed that the kinetic energy for typhoon-scale developing mainly come from the scales which are shorter than typhoon-scale . On the other hand, there is no typhoon-scale. The short waves are the kinetic source for typhoon-scale and large-scale developing in tropical areas .