CEDAR: Thermospheric Tides

这一建议是为了继续利用NCAR热层/电离层通用循环模式进行的热层潮汐研究。这项工作直接解决了NSF CEDAR项目的两个目标；低层热层全球动力学和中间层/热层耦合的详细认识。潮汐研究取得了进展。主要的发展是；1)在热层模式中对低层大气激发的波进行参数化，以更好地表征低层大气与高层大气之间的耦合；2)在热层模式中同时包含了向上传播的日波和半日波；3)模式中的自洽电离层/热层耦合；(4)首次模拟低纬度、中高纬度站同步观测热层风和温度的可行性。这样的数据集对于测试理论潮汐模型是非常宝贵的。提出的研究主要有两个重点：1)提供模型模拟以支持战役；2)潮汐理论研究的继续。后者感兴趣的主要课题是：太阳活动周期极小期和极大期热层潮汐的月度模拟；地磁活动对热层的影响，包括纬向平均/潮汐/重力波相互作用；日潮汐对热层/电离层的影响；纬度大气/电离层。研究可以扩展到垂直速度、昼夜潮汐、午夜温度异常，以及从零星的E层和F1层下降中可能得到的潮汐信息。

This proposal is for continuation of thermospheric tidal studies being conducted with NCAR Thermosphere/Ionosphere General Circular Model. This work directly addresses two goals of the NSF CEDAR program; detailed understanding of the low thermosphere global dynamics and mesosphere/thermosphere coupling. There have been advances in tidal studies. Key developments are; 1) the parameterization of the waves excited in the lower atmosphere in the thermosphere models to better represent the coupling between the lower and upper atmosphere; 2) the inclusion of both the upward propagating diurnal and semidiurnal waves in the thermospheric models; 3) the self-consistent ionosphere/thermosphere coupling in models; 4) the availability of simulation of simultaneous observations of thermospheric winds and temperatures for the first time from loe, mid and high latitude stations. Such data sets are invaluable for testing theoretical tidal models. The research proposed has two main emphasis: 1) the provision of model simulations in support of campaigns; and 2) the continuation of theoretical tidal studies. The main topics of interest for the latter are: monthly simulations of the thermospheric tides during the solar cycles minimum and maximum; the effects of geomagnetic activity on the thermosphere, including the zonal mean/tide/gravity wave interaction; the effects of diurnal tides on the thermosphere/ionosphere; and the latitude atmosphere/ionosphere. Investigation may be extended to the vertical velocities, the terdiurnal and quatradiurnal tides, the midnight temperatures anomaly, and the possible derivation of tidal information from the descent of sporadic E and F1 layer.