台风环境风垂直切变的计算

Computation of Vertical Shear of Environmental Wind of Typhoons

环境风垂直切变小大对台风强度变化有显著影响。通过查阅文献和会议交流发现,由于算法上的细微区别,导致同一个台风在计算环境风垂直切变时结果有所不同,有时差异较大。本研究针对这一问题,以南海快速增强台风为例,利用中国气象局整编的热带气旋年鉴、NCEP FNL、个例数值模拟资料等,计算并对比分析了南海台风在快速增强阶段不同环境风垂直切变计算方案和数据对计算结果的影响,并对业务应用时应该注意的问题展开讨论。

The magnitude of vertical shear of environmental wind has significant effect on the intensity variation of the typhoon. As shown in reference review and communication at seminars, minute differences in algorithms can lead to （ sometimes very） different result of the vertical shear of environmental wind. In this paper, rapidly intensifying typhoons of the South China Sea are used as examples to compute and compare the effect of different schemes of computation and data on these typhoons and to discuss the issues that should be noted in operational application.