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arXiv 1505.04472astro-ph.EPphysics.ao-phphysics.flu-dyn
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火星大气中重力波和高空CO $_2$冰云的形成

Gravity waves and high-altitude CO$_2$ ice cloud formation in the Martian atmosphere

Erdal Yiğit, Alexander S. Medvedev, Paul Hartogh

摘要:

我们提出了第一个大气环流模型模拟,量化和再现补丁的极冷空气所需的CO $_2$冷凝和云的形成在火星中间层。它们是由次网格尺度的重力波(GWs)占在模型中与交互式实现的频谱参数化。GW引起的温度波动和过饱和条件的出现的分布与高空CO $_2$冰云的观测结果吻合得很好。我们的研究证实了全球变暖的关键作用,促进CO $_2$云的形成,讨论了它们的潮汐调制,并预测云的高度高于已观察到的日期。

英文摘要:

We present the first general circulation model simulations that quantify and reproduce patches of extremely cold air required for CO$_2$ condensation and cloud formation in the Martian mesosphere. They are created by subgrid-scale gravity waves (GWs) accounted for in the model with the interactively implemented spectral parameterization. Distributions of GW-induced temperature fluctuations and occurrences of supersaturation conditions are in a good agreement with observations of high-altitude CO$_2$ ice clouds. Our study confirms the key role of GWs in facilitating CO$_2$ cloud formation, discusses their tidal modulation, and predicts clouds at altitudes higher than have been observed to date.

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