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切变流中的CISK机制与惯性重力波 总被引:1,自引:0,他引:1
利用板对称,有切变的大气动力学方程组,由行波法导出非线性微分方程,通过非线性稳定性理论讨论方程的稳定性,求解了KDV方程,并讨论了线性CISK,非线性CISK,惯性稳定度参数和大气风速垂切变对惯性重力孤波强度和宽度的影响,目的早通过了解影响惯性重力孤波发展的因子,更深入地理解低纬中尺度天气系统形成和发展的过程。 相似文献
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本文对1980年夏季50O百帕拟能谱及波与波之间拟能的非线性相互转换作了诊断分析。与斯坦贝格(Steinberg,H.L.)等对1963年2—4月的计算结果作了比较。发现夏季拟能平均谱分布特征与冬半年大致相似。波与波之间拟能的非线性相互转换特征与冬半年不同。斯坦贝格强调,拟能是从大尺度扰动传递给小尺度扰动。我们对夏季的计算结果表明,超长波同时向长波(4—8波)和≥9的短波提供拟能,而短波又向长波提供更大数量的拟能。因此,在波与波之间拟能的非线性相互转换中,超长波有大的拟能净损失.短波有较小的拟能净损失,而长波有较多的拟能净获得。长波和短波的拟能净得失符号正好与冬半年相反。 相似文献
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By using the low-spectral model simplified from quasi-geostrophic approximation two-levelmodel,we obtained the result that the equivalent barotropic state is an equilibrium state of theatmosphere in that model,and discussed the conditions needed for existing the Rossby wavepossessing the equivalent barotropic structure.And then we derived the oscillation equation reflectingthe phase change of Rossby wave between higher and lower levels from the basic state of equivalentbarotropic stationary Rossby wave,indicating the relations between the change of difference of phaseat higher and lower levels and the disturbance of vertical shear,the amplitude disturbance of the partof waves of stream function and thermal wind stream function on the average level (A′ and B′).It isconcluded that the inter-transformation exists between Rossby waves possessing the equivalentbarotropic and baroclinic structure. 相似文献
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采用赤道平衡模式及低阶谱方法,考虑基本气流,一次切变流和二次切变流的影响,给出了描写南亚冬夏季风的非线性方程,重点讨论了基本气流和一、二次切变流对南亚季风形成,转换和强度的影响,并指出一次切变流对南亚季风影响与基本流及二切变流对南亚季风的影响明显不同。 相似文献
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Using a low-order spectral model derived from the equatorial equilibrium model, possible physical mechanisms are interpreted by the theory of multiple equilibria states for the active and break phases of the South Asian Monsoon, with consideration of the effects of heating by cumulus heating and cooling by radiation. The result shows that the South Asian Monsoon is active when the cumulus convection intensifies (or the radiation cooling weakens). the monsoon breaks when the convection weakens (or the cooling intensifies). It is consistent with the hypothesis of cloud-radiation by Krishnamurti et al. 相似文献
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Using the equatorial balanced model and the low-corder spectral method to consider the effect of the basic flow, the primary and secondary shear flows, the nonlinear equation describing the winter and summer monsoon in south Asia is derived.The stress is on the influence of the flows on the formation,transformation and intensity of the monsoon in south Asia.The results show that the influence on the monsoon in south Asia is significantly different among the primary shear flow, the basic flow and the secondary shear flow. 相似文献
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利用由两层准地转模式简化的低谱模式,得知相当正压结构Rrossby波为平衡态,讨论了具有相当正压结构的Rossby波存在所需条件;并以定常Rossby波(相当正压结构)为基态,导出反映高低层Rossby波位相变化的振荡方程,指出高低层位相差的变化与垂直切交流的扰动、平均层上流函数和热成风流函数波动部分振幅扰动(A’和B’)的关系,说明相当正压结构和斜医结构的Rossby波是相互转换的。 相似文献