GCM simulations of Titan’s middle and lower atmosphere and comparison to observations
GCM simulations of Titan’s middle and lower atmosphere and comparison to observations
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GCM 对泰坦中层和低层大气的模拟以及与观测结果的比较
DOI：
10.1016/j.icarus.2014.12.030
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发表时间：
2014
期刊：
影响因子：
3.2
通讯作者：
J. Russell
中科院分区：
文献类型：
--
作者：
J. Lora;J. Lunine;J. Russell
模拟结果从一个新的大气环流模型（GCM）的土卫六，土卫六大气模型（TAM），它耦合的灵活建模系统（FMS）的光谱动力学核心的一套外部/亚网格尺度物理。这些措施包括一个新的非灰色辐射传输模块，利用最近的数据从卡西尼-惠更斯，大规模的冷凝和准平衡湿对流计划，表面模型与“桶”水文，边界层湍流扩散。该模型产生了一个现实的温度结构，从地面到较低的中间层，包括平流层顶，以及令人满意的超旋转。后者被证明取决于动力核心的能力，建立角动量从表面扭矩。模拟的纬度温度对比是足够的，与观测相比，极地温度异常与观测一致。在低层大气中，日照分布强烈影响湍流通量，地面加热在中纬度地区最大。地表液体在中低纬度不稳定，并迅速向极地迁移。模拟的湿度廓线和表面温度分布与观测结果相比，证实了低纬度地区普遍存在干燥状况。极地云的活动是很好的代表，虽然观察到的中纬度云仍然有些令人困惑，并提出了一些替代的形成。
Simulation results are presented from a new general circulation model (GCM) of Titan, the Titan Atmospheric Model (TAM), which couples the Flexible Modeling System (FMS) spectral dynamical core to a suite of external/sub-grid-scale physics. These include a new non-gray radiative transfer module that takes advantage of recent data from Cassini–Huygens, large-scale condensation and quasi-equilibrium moist convection schemes, a surface model with “bucket” hydrology, and boundary layer turbulent diffusion. The model produces a realistic temperature structure from the surface to the lower mesosphere, including a stratopause, as well as satisfactory superrotation. The latter is shown to depend on the dynamical core’s ability to build up angular momentum from surface torques. Simulated latitudinal temperature contrasts are adequate, compared to observations, and polar temperature anomalies agree with observations. In the lower atmosphere, the insolation distribution is shown to strongly impact turbulent fluxes, and surface heating is maximum at mid-latitudes. Surface liquids are unstable at mid- and low-latitudes, and quickly migrate poleward. The simulated humidity profile and distribution of surface temperatures, compared to observations, corroborate the prevalence of dry conditions at low latitudes. Polar cloud activity is well represented, though the observed mid-latitude clouds remain somewhat puzzling, and some formation alternatives are suggested.
金星和土卫六大气环流模型中风引起的赤道隆起：对超级自转模拟的影响
影响因子：
5.2
作者：
Tokano
通讯作者：
Tokano