A thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (time-GCM): Equinox solar cycle minimum simulations (30–500 km)
A thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (time-GCM): Equinox solar cycle minimum simulations (30–500 km)
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DOI：
10.1029/93gl03391
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发表时间：
1994-03
影响因子：
5.2
通讯作者：
R. Roble;E. Ridley
中科院分区：
文献类型：
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作者：
R. Roble;E. Ridley
开发了一个新的具有耦合电动力学的中间层、热层和电离层模拟模式，并用于计算春分、太阳活动周期极小期、地磁平静条件下30-500公里之间的全球环流、温度和成分结构。该模式包含了NCAR热层-电离层-电动力学大气环流模式（TIE-GCM）的所有特征，但下边界从97公里（10毫巴）向下延伸到30公里（10毫巴），它包括了适合于中间层和平流层上部的物理和化学过程。第一个模拟使用瑞利摩擦来表示中层大气中的重力波阻力，尽管它能够关闭中层喷流，但它严重地抑制了昼夜潮汐。减少瑞利摩擦允许潮汐渗透到热层高度，但没有关闭射流。由Fritts和Lu开发的重力波参数化允许这两种功能同时存在，潮汐结构和平均流量取决于重力波源的强度。该模型计算了一个不断变化的动力结构，其中中层的平均流量和周日潮汐占主导地位，热层下层的现场生成的半日潮汐占主导地位，热层上层的现场生成的周日潮汐占主导地位。更多»结果还显示了动力学和成分之间存在相当大的相互作用，尤其是85至120公里之间的原子氧。参考文献31篇，3图。«少
A new simulation model of the mesosphere, thermosphere, and ionosphere with coupled electrodynamics has been developed and used to calculate the global circulation, temperature and compositional structure between 30-500 km for equinox, solar cycle minimum, geomagnetic quiet conditions. The model incorporates all of the features of the NCAR thermosphere-ionosphere-electrodynamics general circulation model (TIE-GCM) but the lower boundary has been extended downward from 97 to 30 km (10 mb) and it includes the physical and chemical processes appropriate for the mesosphere and upper stratosphere. The first simulation used Rayleigh friction to represent gravity wave drag in the middle atmosphere and although it was able to close the mesospheric jets it severely damped the diurnal tide. Reduced Rayleigh friction allowed the tide to penetrate to thermospheric heights but did not close the jets. A gravity wave parameterization developed by Fritts and Lu allows both features to exist simultaneously with the structure of tides and mean flow dependent upon the strength of the gravity wave source. The model calculates a changing dynamic structure with the mean flow and diurnal tide dominant in the mesosphere, the in-situ generated semi-diurnal tide dominating the lower thermosphere and an in-situ generated diurnal tide in the upper thermosphere.more » The results also show considerable interaction between dynamics and composition, especially atomic oxygen between 85 and 120 km. 31 refs., 3 figs.« less