球面正压大气的波谱分析  

Wave spectra analysis in spherical barotropic atmosphere

作　　者：张铭[1] 张立凤[1] 

机构地区：[1]解放军理工大学气象学院大气环流与短期气候预测实验室,南京211101

出　　处：《水动力学研究与进展（A辑）》2006年第1期130-138,共9页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金重点项目40233027资助

摘　　要：本文对球面上有基流的正压大气小扰动进行了波谱分析。结果表明,此时存在三支波动:一支涡旋波和一对重力惯性波。实际大气中在扰动尺度不过分小的情况下,当基流的角速度为常数时,这三支波动均为离散谱;而当基流角速度有切变时,则涡旋波有连续谱存在,而重力惯性波则仅有离散谱。重力惯性波的频率远大于涡旋波的频率,前者是快波,后者是慢波,两者频率能明显区分。Wave spectrum of disturbance is analyzed in spherical barotropic atmosphere with basic flow. It is shown that here are three waves - a vortex wave and a couple of inertial gravitational waves. When disturbance scale in real atmosphere is not very small and the angular velocity of basic flow is constant, above-mentioned three waves have merely discrete spectra. When the angular velocity of basic flow is not constant, the vortex wave has also continuous spectrum but the inertial gravitational waves have just discrete spectra. The frequency of inertial gravitational waves is very greater than the frequency of vortex wave. The former are quick wave and the latter is slow wave. The both can clearly be divided from frequency.

关 键 词：球面 正压大气 波谱 

分 类 号：P435[天文地球—大气科学及气象学]