摘要
从描述西南低涡运动的中尺度原始方程组出发，对低涡系统作水平分布的零阶Ｂｅｓｓｅｌ函数近似，在铅直方向上取６层斜压模式近似；导出了西南低涡移动速度的控制方程，得到了影响低涡移动的较为全面的因子，并通过对个例进行６层斜压模式的数值计算和诊断分析，找出了对低涡移动取决定性作用的决定性因子、一般影响因子、作用较小的修正因子和贡献极其在弱的不影响因子。然后分析和讨论了各因子对低涡移动作用的物理意义，为认识西南低涡移动的物理机制及用于业务预报提供参考。
Beginning from the mesoscale primitive equation systems describing the movement of southwest vortex and with the approximation of Bessel function of zero order to its horizontal distribution and that of a six laver haroclinic model,the equation controlling the velocity of southwest vortex movement is obteined. It movement process is simulated and dlagnosed wiht the six layer baroclinic model. Various factors effecting the movement of the southwest vortex are selected and their physical significance is discussed.
关键词
西南低涡
移动
动力分析
数值模拟
低涡
Southwest vortex
Movement
Dynamical analysis
Numerical simultation.
