摘要
通过建立包含扰动和基流方程组的数值模式,全面讨论了扰动与对称不稳定纬向基流的相互作用。研究表明:扰动与基流的相互作用表现为以下两个方面:(1) 扰动改变了基流,而改变了的基流又对扰动有反馈作用;(2) 扰动的平均输送同时也改变扰动自身的结构,从而影响扰动的发展。由对称不稳定基流激发的扰动倾斜环流使基流环境场发生的改变不利于对称不稳定的进一步发展;而由扰动的平均输送所产生的影响则有利于对称不稳定的进一步发展,并且后者的作用强于前者。
In a numerical model especially set up in the work that includes disturbance and basic flows, the interactions between disturbances and symmetric instability are discussed comprehensively. The study shows that the interactions display the following features that (1) the basic flow, changed by the disturbance, has feedback on the latter, and (2) the mean transfer of disturbance changes the very structure of the disturbance to affect its evolution. Slantwise circulation of disturbance as excited by symmetrically unstable basic flows has changed the ambient field so that the symmetrical instability keeps evolving. On the other hand, the influence as produced by mean transfer of disturbance is favorable for deeper evolution of the symmetrical instability, with the latter being more important than the former.
出处
《热带气象学报》
CSCD
北大核心
2004年第3期289-301,共13页
Journal of Tropical Meteorology
基金
国家自然科学基金项目(40175012)资助
关键词
对称不稳定
基流
扰动
相互作用
symmetrical instability
basic flows
disturbance
interactions
