对流层上层副热带高压的东西振荡
投稿时间:1984-04-23  修订日期:1984-11-23  点此下载全文
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罗哲贤 甘肃省气象局 
中文摘要:本文用低谱途径,将二层准地转模式化为一个八维的强迫耗散的非线性系统。沿南北方向除赤道与极地之间的热力强迫外,模式还包含近似描述增温的副热带大陆与其南面海洋之间热力差异的强迫参数θC*.在θC*的一定范围内,模式大气显示出多平衡态特征,它们分别对应于对流层上层副热带高压的东部型和西部型流型。θC*越过临界值后,模式大气又显示出多周期态特征,它们分别对应于对流层上层副热带高压的不同形式的东西振荡。
 
ZONAL OSCILLATION OF SUBTROPICAL HIGH-PRESSURE CELLS AT 250 HPA
Abstract:By way of a low-order spectral model,the two-layzer quasi-geostrophic model is translated into an eighthorder set of nonlinear ordinary differential equations in which the thermal forcing and dissipative effect are incorporated. Within a certain range of the parameter θC*,which approximately describes the S-N thermal forcing between the subtropical continent and the ocean to the south,an equilibrium of the flow pattern is exhibited. When the θC* value exceeds the critical point,a periodical zonal oscillation of the subtropical high cells can be stimulated showing various oscillational forms.
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