我国东部海域不同类型的登陆再发展变性台风的统计分析

本文对1982年以来我国东部海域登陆再发展台风进行统计分析,选取其中15个个例进行对比分析,根据其移动路径和增强幅度分为3类,研究表明:台风如果移向东北方向则再发展较弱,而向北移动则发展较深,且向北越深发展越强,这与副热带高压(副高)的位置和强度以及上游高空槽存在一定的关系(整体偏向于正相关),在北上的过程中,如果与高空正位涡发生耦合,则增强越大,但非绝热加热所占的比重越小。同时动能收支分布显示,台风加强越深,动能转换越强,两者成正比,但在能量转化的方向和位置上,三者又存在差异。

STATISTICAL ANALYSIS OF DIFFERENT TYPES OF TYPHOON LANDED ON CHINA'S EASTERN COAST WITH RE-INTENSIFICATION AND EXTRATROPICAL TRANSITION

We studied statistically the typhoons landed on China''s eastern coast with re-intensification since 1982 and classified them into three types in terms of the path and re-intensification degree. The results show that typhoon re-intensification is weaker when moving northeastward then northward. The deeper and the more northern movement, the stronger the re-intensification would be, which is related to the position and the strength of the subtropical high and the upper trough (tends to have a positive correlation in general). In addition, during the progress of going northward, the re-intensification would be stronger if coupled with high altitude potential vorticity, and diabatic heating accounted for a small proportion. As shown in kinetic energy budget distribution, the greater the kinetic transfer, the stronger the re-intensification, showing a positive correlation. However, in the direction and location of energy conversion, the three types of typhoon present differences.