波与基流相互作用下的对称不稳定中尺度环流的发展  

EVOLUTION OF SYMMETRICALLY UNSTABLE MESOSCALE CIRCULATION UNDER THE INTERACTIONS BETWEEN WAVES AND BASIC FLOWS

作　　者：寇正[1] 陆汉城[1] 宋晓亮[1] 刘凯[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101

出　　处：《热带气象学报》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

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.

关 键 词：对称不稳定 基流 扰动 相互作用 

分 类 号：P435.2[天文地球—大气科学及气象学]