热带气旋对副热带高压短期时间尺度变化的影响

EFFECTS OF TROPICAL CYCLONE ON THE SHORT TIME SCALE EVOLUTION OF SUBTROPICAL HIGH

中文关键词:  热带气旋  副热带高压  短期时间尺度演化  机制

英文关键词:Tropical cyclone  Subtropical high  Short time scale evolution  Mechanism

中文摘要:

      文中用NCEP/NCAR逐日资料对西太平洋副热带高压的短期时间尺度演化进行了诊断研究,接着对诊断结果进行了理论分析,并用一个正压原始方程模式实施数值试验。结果表明,副热带高压南侧东风气流中的热带气旋及其频散生成高值系统与副热带高压的相互作用,可以形成台风北上副热带高压断裂后的纬向非对称流型和脊线与纬圈斜交的现象;同时讨论了存在这种相互作用的约束条件。

英文摘要:

      Using NCEP/NCAR daily data in the period from 1994.5.6.00h to 5.23.12h. The short time scale evolution of the subtropical high for the western north Pacific basin is studied diagnostically. The diagnostic results are supported by the theoretic analyses and by a shallow-water equations model experiment. Results show that the interaction among a tropical cyclone in easterly current on the south of the subtropical high, its dispersion-deduced high value system, and the subtropical high can Great the subtropical flow pattern having asymmetric feature along the latitude circle and the ridge line with the direction from northeast to southwest rather than from right east to right west. The conditions under which the interaction nay occur are also disussed.