热岛效应强迫下的中尺度环流的动力特征及极限风速的一种解析表达

DYNAMIC CHARACTERISTICS OF MESOSCALE CIRCULATION FORCED BY HEAT ISLAND AND AN ANALYTICAL SOLUTION OF CRITICAL VELOCITY

中文摘要:

      本文采用考虑热岛造成的局地热力扭动的Boussinesq二维垂直剖面的动力方程组,利用高截断谱方法,得到一类稳定的中尺度非线性平衡态和极限风速的解析表达,证明了局地中尺度环流是热岛造成的局地热力扰动和平流非线性共同作用的结果;并进一步讨论了热岛强迫下的这类局地环流的某些动力特征。

英文摘要:

      By using Boussinesq dynamic equations on two-dimensional vertical cross section, which include local heating perturbation caused by heat islaned, and highly truncated spectral method, a sort of stable mesoscale nonlinear equilibrium states and an analytical solution of critical velocity are obtained. It is found that local mesoscale circulation is produced by both local heating perturhation induced by heat island and nonlinear advection. Furthermore, some dynamic characteristics of local circulation forced by heat island are discussed.