对称不稳定与初始扰动尺度关系的数值研究  

THE NUMERICAL STUDY ON THE RELATION BETWEEN SYMMETRICAL INSTABILITY AND THE SCALE OF INITIAL DISTURBANCE

作　　者：寇正[1] 陆汉城[1] 宋晓亮[1] 

机构地区：[1]解放军理工大学气象学院大气科学系,江苏南京211101

出　　处：《热带气象学报》2004年第1期81-89,共9页Journal of Tropical Meteorology

基　　金：国家自然科学基金项目(40175012)资助

摘　　要：利用一个二维非弹性非静力的数值模式,讨论了初始扰动的尺度对于对称不稳定发展的影响。结果表明:虽然对称不稳定是β-中尺度的不稳定,但其不一定必须由β-中尺度的扰动来激发;由不同水平尺度的扰动所激发的倾斜环流有不同的特点;对称不稳定倾斜环流可能存在最小临界尺度;对称不稳定的发展存在最优扰动水平尺度,而扰动的垂直尺度对于对称不稳定的发展影响不大。An anelastic and non-hydrostatic two-dimensional numerical model is used to study the influence of initial disturbances scale on the development of symmetrical instability. The results show that: The symmetrical instability does not have to be stirred by horizontal disturbance of correspondent scale of the symmetrical instability; the slant circulations, which are stirred by disturbances of different scales, have different specialties; there may be a minimum critical scale in symmetrical instability slant circulations; there is also an optimal horizontal scale to the development of symmetrical instability, while the vertical scale of disturbance throws less influence on symmetrical instability.

关 键 词：对称不稳定 初始扰动 尺度 倾斜环流 

分 类 号：P432[天文地球—大气科学及气象学]