小尺度系统对涡旋自组织的影响  

Influences of a Small-Scale System on the Self-Organization of Vortices

作　　者：代刊[1] 罗哲贤[2] 滕代高[1] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044 [2]南京信息工程大学遥感学院,江苏南京210044

出　　处：《南京气象学院学报》2008年第2期158-166,共9页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40333028)

摘　　要：在涡旋自组织动力学的框架内,利用f平面准地转正压模式讨论小尺度涡旋系统对两个中β尺度涡旋的自组织过程的影响。4组数值试验表明:小尺度涡旋的存在,可能会改变双涡相互作用的终态,使原本不合并的两个涡旋组织起来;双涡相互作用的终态对小尺度涡旋的初始位置敏感;存在"Z"型敏感区域,当小尺度涡旋出现在这一区域时,就有可能改变双涡相互作用的终态;小尺度涡旋对双涡相互作用产生影响需具备4个条件,即初始位于敏感区内,有足够的强度,距离适当且生存时间足够长。In the framework of vortex self-organization dynamics,the influences of a small-scale system on the self-organization process of two meso-β vortices are investigated by utilizing an f-plane 2D quasi-geostrophic barotropic vorticity equation model. Four groups of numerical experiments are performed, and the results show that： the small-scale system may change the two vortices interaction and trigger the merging process;the final state is sensitive to the initial location of the small-scale system; there is a ＂Z＂ shape sensitive region, when a small-scale vortex initially appears there, resulting in the fact that the interaction stage of the two vortexes is more likely to be changed;for altering the vortices interaction results, the small-scale system should satisfy the following three necessary conditions：an initial position in the ＂Z＂ shape sensitive region, proper distances to other two vortices, enough intensity and longer life cycle.

关 键 词：涡旋 自组织 多尺度 

分 类 号：P44[天文地球—大气科学及气象学]