Atmospheric general circulations of cloud-covered planets

太阳系外类地行星的大气动力学研究需要一个适用于大范围物理参数的行星大气环流统一理论。本工作阐明了云覆盖的中层大气环流对天文参数的敏感性。当行星自转轴的倾斜度增加时，超旋转流（逆大气旋转）变得更弱。大于60Ω时，形成亚旋转流（逆行大气旋转）。在缓慢旋转的行星中，逆行旋转速率被限制为-Ω（其中Ω是行星的旋转速率）。此外，本文还阐明了超旋转对云层下非绝热加热率的敏感性。低层大气微弱加热的微小变化导致中层大气超旋的剧烈变化。

An unified theory of planetary atmospheric circulation, which can be applied for wide ranges of physical parameters, is required to study atmospheric dynamics of extrasolar terrestrial planets. The present work elucidates sensitivities of cloud-covered middle-atmospheric general circulation to astronomical parameters. As tilt of the planetary rotation axis is increased, superrotational flow (prograde atmospheric rotation) becomes weaker. For more than 60Ω, subrotational flow (retrograde atmospheric rotation) is formed. In slowly rotating planets, the retrograde rotation rate is limited to -Ω (where Ω is the planetary rotation rate). In addition, the present work elucidates sensitivity of the superrotation to diabatic heating rate below the cloud layer. Small changes in the weak lower-atmospheric heating lead to drastic changes of the middle-atmospheric superrotation.