Influences of Venus’ topography on fully developed superrotation and near-surface flow
Influences of Venus’ topography on fully developed superrotation and near-surface flow
复制标题
金星地形对完全发展的超级自转和近地表流的影响
DOI：
10.1186/bf03352962
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
M. Takahashi
中科院分区：
文献类型：
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作者：
Masaru Yamamoto;M. Takahashi
研究地形对金星大气环流的影响。基于金星地形的对比模拟，我们阐明了地形在充分发展的超旋转中的作用。地形强迫静止波在麦克斯韦山上占主导地位：略微削弱了云顶附近的超旋转。与以往的GCM结果不同，地形强迫波在当前模式中没有在南北半球超旋之间产生明显的不对称性。从山区到低地的微弱地表流动是由牛顿冷却的压力依赖性引起的。近地表流动的模式和强度与Herrnstein和Dowling（2007）模型中模拟的大不相同。这意味着物理过程的参数化（如牛顿冷却、湍流、扩散和表面阻力）和模式分辨率可以显著影响近地表流动的模式和大小以及行星尺度平稳波的地形强迫。
We investigate the influence of topography on Venus’ atmospheric general circulation. Based on comparative simulations with and without the Venusian topography, we elucidate the role of the topography in the fully developed superrotation. Orographically forced stationary waves are predominant over Mt. Maxwell: slightly weakening the superrotation near the cloud top. Differently from previous GCM results, the orographically forced waves do not produce significant asymmetry between the northern and southern hemispheric superrotations in the present model. Weak surface flows from mountains to lowlands are caused by the pressure dependence of the Newtonian cooling. The pattern and magnitude of the near-surface flow are largely different from those simulated in the Herrnstein and Dowling (2007) model. This implies that the parameterizations of physical processes (such as Newtonian cooling, turbulence, diffusion, and surface drag) and the model resolution could significantly influence the pattern and magnitude of the near-surface flow and the orographical forcing of planetary-scale stationary waves.