郑维忠,余志豪. 1987. 非线性斜压不稳定问题中的摩擦和对流凝结加热作用[J]. 气象学报, 45(1):13-20, doi:10.11676/qxxb1987.002
非线性斜压不稳定问题中的摩擦和对流凝结加热作用
THE ROLE OF FRICTION AND HEATING OF CONVECTIVE CONDENSATION IN BAROCLINIC INSTABILITY PROBLEM
投稿时间:1985-08-12  修订日期:1986-06-06
DOI:10.11676/qxxb1987.002
中文关键词:  
英文关键词:
基金项目:
作者单位
郑维忠 南京大学大气科学系 
余志豪 南京大学大气科学系 
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中文摘要:
      本文用β平面两层准地转斜压模式,讨论了具有摩擦耗散作用和对流凝结加热作用的斜压不稳定有限振幅问题,并对所得的有限振幅斜压波的振幅控制方程进行了数值积分。结果指出,在无耗散作用时,斜压不稳定波的振幅是周期振荡的。当摩擦耗散作用仅存在于下层时,不稳定波振幅最终趋于一个为零的平衡态;当上下层都存在摩擦耗散时,对流加热强度较弱(即m*<1),则存在着一个振幅为零,另外两个为非零的多平衡态,而扰动波振幅最终趋于非零的平衡态。对流加热较强时(即m*≥1),则仅存在振幅为零的单个平衡态,扰动波振幅最终趋于这个平衡态。
英文摘要:
      By using of the two-level quasi-geostrophic baroclinic model on the β-plane, the finite-amplitude problem of baroclinic instability with frictional dissipation and heating of convective condensation has discussed in this paper. The finite-amplitude equation joined is intc:orated numerically.It is shown that the amplitude of the unstable b:moclinic wave evolves periodically if no discipotion exists, and finally approaches to an equilibrium state in mhich the amplitulle will be zero while the frictional dissipation exists only in Inwer layer Under the condition that there is frictional dissipation in both layers, the multiple equilibrium states exist. If the couvcctive heating is weaker (m*<1), one of the equilibrium states is with zero amplitude and another two are non zero. and the amplitude of disturbance wave approaches to non zero eyuilibrium.But, only single equilibriurn state of zero amplitude exists if the convective heating is stronger (m*≥1), to which the amplitude of the disturbance wave finally approaches.
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