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

本研究的主要目的是探讨热阻尼和表面阻力对非线性斜压波平衡行为的影响。这将通过使用多级原始方程模型进行数值实验来完成。模拟将首先是单波类型（其中非线性相互作用主要是一个纬向波和纬向平均流之间的非线性相互作用），然后是多波性质（不同纬向波之间有相当大的相互作用）。在数值实验中，热阻尼和表面阻力的影响将通过牛顿冷却和简单的摩擦参数化来简单地表示。模拟的分析将集中在“状态”特征和变异上，以及平衡的纬向平均流的结构上。这项工作将有助于对完全发展的斜压流的基本理解，其中不对称的外部强迫是不存在的。这项研究很重要，因为所研究的大气波的动力学对长期的天气特征和气候有着深远的影响。气候模拟和预测的改进需要加强对这些动力学的认识。

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.