Gravity Wave Spectrum in the Middle Atmosphere

摘要ATM-9419683 Zhu 提出了一种新的中层大气重力波谱形成方法，以研究中层大气中尺度波动的统计特性。 初步研究表明，中层大气温度扰动的尺度相关辐射阻尼是理解重力波谱的一个重要过程。 对这一主题的进一步研究将充分探索各种光谱源和吸收汇之间的平衡的基本思想，包括其他可能重要的物理过程，如光化学辐射耦合，共振波-波相互作用和分子扩散，在模型中。 我们的理论研究将在一个二维（纬度和高度）的数值模式。 我们的模型结果将进行比较，从平地雷达的非线性波-波相互作用和测量从飞机上极地臭氧的垂直混合可用的观测。 最终目的是为重力波饱和引起的大尺度背景流中的涡动扩散和动量沉积提供一个更符合实际的参数化方法。

Abstract ATM-9419683 Zhu A new approach on the formation of gravity wave spectrum in the middle atmosphere is proposed to investigate the statistical properties of the observed mesoscale fluctuations in the middle atmosphere. A preliminary study has shown that scale-dependent radiative damping of the temperature perturbations in the middle atmosphere is an important process in the understanding of the gravity wave spectrum. Further research on this subject will fully explore the basic idea of a balance among various spectral sources and sinks by including other possibly important physical processes, such as photochemical-radiative coupling, resonant wave-wave interactions, and molecular diffusion, in the model. Our theoretical studies will be implemented in a two-dimensional (latitude and altitude) numerical model. Our model results will be compared to the available observations from the Flatland radar for the nonlinear wave-wave interactions and measurements from aircraft on polar ozone for the vertical mixing. The ultimate objectives are to provide a more realistic parameterization for the gravity wave saturatimn induced eddy diffusion and momentum deposition in the large scale background flow.