基于CISK理论对环境流场影响台风发生发展的分析

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。结果表明,环境风场的涡度分布在对流层低层为气旋性涡度随高度增加,而在对流层高层为反气旋性涡度随高度增加时有利于台风低压的发生发展;非热成风存在且与热成风符号相反时有利于台风低压的发生发展。

THE INFLUENCE OF BASIC FLOW ON THE FORMATION AND DEVELOPMENT OF TROPICAL CYCLONES

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. Theoretical study shows that when cyclonic vorticity increases with height in lower troposphere and anticyclonic vorticity increases with height in upper troposphere, and when there exists non-thermal wind in the opposite direction of the thermal wind, tropical cyclones are likely to form and develop easily.