中文摘要：

热带气旋生成过程中包含不同尺度环流及其相互作用。为此，本文将热带气旋生成数值模拟的起点提前到模拟中尺度涡旋（MCV）的生成，从而利用高分辨率数值试验结果，对热带气旋过程中的不同尺度涡旋活动进行分析。模式首先模拟了季风涡旋的东南侧增强的西南气流中出现低形变旋转性扰动，随着扰动的旋转性增强，中层出现水平尺度为200km左右的MCV。在扰动区内的不同高度上还发现10～20km尺度不等的中γ气旋性涡旋扰动，其中部分涡旋扰动具有热塔的特征，中γ气旋性涡旋扰动在MCV的旋转环境内不断组织化，低层气旋性涡旋扰动的分布比中层更加集中。模拟表明这些较小尺度的气旋性中尺度涡旋扰动对热带气旋的生成有重要作用。

英文摘要：

The formation of a Tropical Cyclone （TC） involves multiple scale circulations and their interactions. Because of the lack of the observation data, the learning about mesoscale circulation during the genesis process is much insufficient. Different from the previous researches, the simulation initial time of TC genesis had to be moved up to the time of genesis of Mesoscale Convective Vortex （ MCV）, so the high-resolution numerical simulation results were used to analyze the multi-scale vortex activity during the genesis of TC. This paper simulates first the low-deformation disturbance in the enhanced southwest- erly flows on the southeast side of monsoon gyre. With the rotation property of the disturbance enhancing, the MCV with horizontal scale around 200 km in the low-deformation area formed. Meso-γ vortices with 10-20 km horizontal scale were also present in the low-deformation area, some of which were vertical hot towers. The favorable cyclonic environment created by MCV facilitates organization of meso-γ vortices. It is concluded that the distribution of low-level vortices are more concentrated than that of mid-level. The simulation results show that these meso-γ vortices play important roles in tropical cyclogenesis.