本文用一基于第二类条件性不稳定机制（CISK）的简单数值模式研究了由于非热成风的存在和环境风场垂直切变的水平变化对台风低压发生发展的影响。
Using simple dynamic model based on the theory of CISK , this paper discusses the influence of basic flow with horizontal change of vertical shear and with non-thermal wind on the formation and development of tropical cyclones .
第二类条件性不稳定