东南亚夏季风中断、过渡与活跃期的区域能量学研究

A Study on the Regional Energetics during Break, Transitional and Active Periods of the Southwest Monsoon in South East Asia

对两次季风演变过程的能量学研究表明，季风演变具有鲜明的阶段性能量学特征。中断期，积云加热小，两个转换函数值很小；过渡期，积云加热增强明显，两个转换函数值迅速加大，边界输送作用也明显朝有利方向变化，同时，纬向平均气流变为向季风供应扰动动能；活跃期，大尺度加热变得重要，积云加热维持，两个转换函数也保持大的正值。分析表明，印度季风东传对东南亚季风活跃的触发作用是重要的，但季风活跃的维持则主要依靠区域内部能量学过程。

Through the investigation into the evergetics of the monsoon we have found taht distinct features exist for different periods. For the break stage, the heating by cumulus convections is weak and the two concersion functions are small. For the transitional stage, the cumulus heating and the two conversion functions increase greatly, the boundary transport tends to be favourable, meanwhile, the zonal mean flow begins to provide perturbation energy for the monsoon. During the active stage, the heating by the large scale condensation appears to be significant and that by cumulus convections remains strong. The large values of the two conversion functions also maintain. Further analysis drops a hint that the eastward propagation of the Indian monsoon may play a triggering.role in the transition of the monsoon in Southeast Asia. However, the inner energetics process in the area is mainly responsible for its maintenance.