Parameterization of Planetary Wave Breaking in the Middle Atmosphere
Parameterization of Planetary Wave Breaking in the Middle Atmosphere
复制标题
中层大气中行星波破碎的参数化
DOI：
10.1175/1520-0469(1991)048
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发表时间：
1991
影响因子：
3.1
通讯作者：
R. Garcia
中科院分区：
文献类型：
--
作者：
R. Garcia
本文发展了一种行星波在中层大气中破碎的参数化方法，并在一个数值模式中进行了检验，该模式包括单波和纬向平均态的控制方程。参数化的基础是假定波浪破碎代表波浪活动通量与非线性过程耗散之间的稳态平衡，而后者可表示为主波的线性衰减。有了这一点和另外一个假设，即破裂的效果是为了防止进一步的幅度增长，所需的耗散率很容易从波浪活动的稳态方程中获得；然后，扩散率系数由耗散率得出。推导中所作的假设与重力波破裂的参数化中常用的假设是等价的，但根据波浪活动性的表述有助于突出波群速度在决定耗散率中的中心作用。比较..。
Abstract A parameterization of planetary wave breaking in the middle atmosphere has been developed and tested in a numerical model which includes governing equations for a single wave and the zonal-mean state. The parameterization is based on the assumption that wave breaking represents a steady-state equilibrium between the flux of wave activity and its dissipation by nonlinear processes, and that the latter can be represented as linear damping of the primary wave. With this and the additional assumption that the effect of breaking is to prevent further amplitude growth, the required dissipation rate is readily obtained from the steady-state equation for wave activity; diffusivity coefficients then follow from the dissipation rate. The assumptions made in the derivation are equivalent to those commonly used in parameterizations for gravity wave breaking, but the formulation in terms of wave activity helps highlight the central role of the wave group velocity in determining the dissipation rate. Compariso...