摘要
为了研究垂直方向静力适应过程的机理,通过垂直方向静力适应方程组导出适应过程的守恒量、适应终态和解析解,并对解析解进行数值模拟。研究结果表明:适应终态是由初始守恒量和基本场决定。垂直速度解析解是由声波和地面反射的声波组成。随着高度的增加,垂直速度呈现e的负指数衰减。适应时间依赖于初始扰动的强度和空间尺度,扰动值越大,范围越广,适应时间越长。浮力振荡频率值的大小影响适应范围,当浮力振荡频率值减小,静力适应影响范围将更广。
In order to study the mechanism of the vertical hydrostatic adjustment procedure, the con- served quantity, final equilibrium state and analytical solution of the procedure are deduced through the vertical hydrostatic adjustment equations, and then the analytical solution is numerically simulated. The results show that the final equilibrium state is determined by the initial conserved quantity and the basic state variables, and the analytical solution of vertical speed is consisted of the acoustic wave and the ground-reflected acoustic wave. The vertical velocity decreases exponentially with the height. The adapta- tion time depends on the intensity and spatial scales of initial disturbance. The higher the intensity value is, the larger the spatial scale is and the longer the adaption procedure is. The value of buoyancy oscilla- tion frequency affects the intensity of spatial range. When the buoyancy oscillation frequency value de- creases, the hydrostatic adaption procedure affects a wider range.
出处
《气象科学》
北大核心
2015年第4期462-467,共6页
Journal of the Meteorological Sciences
基金
国家自然科学基金面上项目(41175089)
关键词
动力气象
静力适应过程
守恒量
适应终态
解析解
Dynamic meteorology
Hydrostatic equilibrium state
Analytical solution adjustment procedure
Conserved quantity
Final
