Effects of Thermal Damping and Surface Drag on the Equilibrium Behavior of Baroclinic Waves

本研究的主要目的是研究热阻抗和表面阻力对非线性斜压波平衡行为的影响。这将通过使用多层原始方程模式进行数值实验来实现。模拟将首先是单波型(其中非线性相互作用主要是一个纬向波与纬向平均流之间的相互作用)，然后是性质上的多波(不同纬向波之间有相当大的相互作用)。在数值实验中，热阻和表面阻力的影响将被简单地表示为牛顿冷却和简单的摩擦参数化。对模拟的分析将侧重于“区域”特征和可变性，以及平衡的纬向平均气流的结构。这项工作将有助于对不存在非对称外强迫的充分发展的斜压流的基本理解。这项研究很重要，因为要研究的大气波的动力学对扩展的天气特征有深远的影响，从而对气候也有影响。气候建模和预测的改进需要加强对这些动态的了解。

The primary objective of this research is to investigate the influence of thermal damping and surface drag on the equilibrium behavior of nonlinear baroclinic waves. This will be done by carrying out numerical experiments with a multi-level primitive equation model. The simulations will first be of a single-wave type (in which the nonlinear interactions are largely those between one zonal wave and the zonal-mean flow), and then be multiple-wave in nature (with considerable interactions between different zonal waves). In the numerical experiments the effects of thermal damping and surface drag will be simply represented, by Newtonian cooling and a simple frictional parameterization. Analysis of the simulations will focus upon the "regime" character and variability, and also on the structure of the equilibrated zonal-mean flows. This work will contribute to the basic understanding of fully developed baroclinic flows in which asymmetric external forcing is absent. This research is important because the dynamics of the atmospheric waves to be studied has a profound influence on extended weather features, and hence climate. Improvements in climate modeling and prediction require enhanced knowledge of these dynamics.