A Coupled Model of the Effects of Planetary Waves on the Zonally Averaged State of the Middle Atmosphere

中层大气环流是由化学、物理和动力过程的复杂相互作用驱动的。理想情况下，这种循环应该用一个完整的三维模型来模拟，但这样做可能在计算上令人望而却步。出于这个原因，也为了隔离某些过程进行深入研究，研究人员在大部分工作中依赖于更简单的模型。在设计更简单的模型时，研究人员努力使它们尽可能真实。在她的上一个奖项中，首席研究员将准地转时变波模型与中层大气（主要是平流层）的纬向平均（二维）化学-辐射动力学模型耦合在一起。波浪模型用于确定罗斯比波对平均流的驱动以及随后化学物质的涡动输运。她的目标是获得更真实的平流层环流和相关痕量物质运输的模拟，而不是单独使用二维模型。有了这个更新奖，史密斯博士将继续她对中层大气的研究。在对流层顶增加一个相互作用的下边界后，耦合模式将变得更加真实。然后，主要目标将是评估耦合模式的动力相互作用的质量和模拟化学物质输送的能力（化学物质的分布也影响环流）。耦合模型将与平流层的完全非线性三维模型进行详细比较，以确定波模型表示输运过程的能力。

The circulation of the middle atmosphere is driven by complex interactions of chemical, physical, and dynamical processes. Ideally this circulation should be simulated with a fully three dimensional model, but to do so can be computationally prohibitive. For this reason, and also in order to isolate certain processes for in-depth studies, researchers rely on simpler models for much of their work. In designing simpler models, researchers endeavor to make them as realistic as possible. Under her last award, the principal investigator coupled a quasi-geostrophic time-dependent wave model to a zonally averaged (two-dimensional) chemical- radiative-dynamical model of the middle atmosphere (principally the stratosphere). The wave model is used to determine the driving of the mean flow by Rossby waves and subsequently the eddy transport of chemical species. Her goal was to obtain more realistic simulations of stratospheric circulation and associated trace species transport than would be possible with the two dimensional model alone. With this renewal award, Dr. Smith will continue her research on the middle atmosphere. The coupled model will be made more realistic with the addition of an interactive lower boundary at the tropopause. The principal objective then will be to assess the quality of the coupled model's dynamical interactions and the ability to simulate transport of chemical species (the distribution of which also affects the circulation). The coupled model will be compared in detail with a fully nonlinear three dimensional model of the stratosphere to determine the ability of the wave model to represent transport processes.