谢义炳,黄寅亮. 1964. 赤道辐合带上扰动不稳定性的简单理论分析[J]. 气象学报, 34(2):198-210, doi:10.11676/qxxb1964.021
赤道辐合带上扰动不稳定性的简单理论分析
A PRELIMINARY THEORETICAL STUDY ABOUT THE INSTABILITY OF THE WAVES ALONG THE INTERTROPICAL CONVERGENCE ZONE
投稿时间:1963-09-23  修订日期:1964-01-01
DOI:10.11676/qxxb1964.021
中文关键词:  
英文关键词:
基金项目:
作者单位
谢义炳 北京大学地球物理系 
黄寅亮 北京大学地球物理系 
摘要点击次数: 1827
全文下载次数: 1683
中文摘要:
      本文采用了简单的流体力学方法,在三种模式——正压扰动层、相当正压层、三维扰动——的情况下,对赤道辐合带上的扰动切变不稳定进行了理论分析,分别给出了分析解、数值解及可能的数值解方法。分析结果证明:不稳定情况的出现,与基本气流间切变的大小、纬度、及扰动的波长有关。一般在中高纬度分析中经常忽略的2ωcosφ是一个稳定因子。由简单到较复杂的模式分析中,可以看出实际情况是很复杂的,简单模式中所忽略的因子,可能增加了不稳定性。本文从理论上初步证实,在台风发生过程中,基本气流的动能由于不稳定转变为扰动动能,可能是一个并不是不重要的机制。
英文摘要:
      In this paper, the instability of the waves along the intertropical convergence zones is studied by means of three models: the barotropic model, the equivalent barotropic model and the three dimensional model. Analytical and numerical solutions are given for the first and the second models respectively. A possible approach for the solution of the last model is suggested. The result shows that the instability is related to the shear of basic currents, the latitude and the wave length. 2ωcosφp has been shown to be a stability factor. It has been also shown that the factors neglected in simpler models may lead to increase the instability. It gives a preliminary theoretical prove for the quite well-known synoptic experience than the transformation of the kinetic energy of the basic currents to the eddy energy of the vortices may not be considered as an un-important mechanism for the initiation of typhoons.
HTML   查看全文   查看/发表评论  下载PDF阅读器
分享按钮