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arXiv 2202.11974astro-ph.EP
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内强迫对辐照巨行星大气环流的影响

Influences of internal forcing on atmospheric circulations of irradiated giant planets

Yuchen Lian, Adam P. Showman, Xianyu Tan, Yongyun Hu

摘要:

近距离的巨行星有强烈的恒星辐射,表现出大气环流模式,有强烈的赤道喷流和全球尺度的驻波。到目前为止,几乎所有关于这类巨行星大气环流的建模工作主要只考虑外部辐射,而没有考虑内部热通量的作用,或者只是以非常简化的方式处理它。在这里,我们研究的大气环流的强辐照的巨行星的影响,考虑的内部强迫,其特点是小尺度随机内部热扰动,使用三维大气环流模式。我们发现,扰动激发波可以在很大程度上改变大气环流模式的存在下,相对较强的内部强迫。具体而言,我们的模拟表明三个环流制度:超旋转制度,中纬度急流制度,准周期振荡制度,这取决于外部和内部强迫的相对重要性。研究还发现,强内强迫可以引起显着的修改的热相曲线。

英文摘要:

Close-in giant planets with strong stellar irradiation show atmospheric circulation patterns with strong equatorial jets and global-scale stationary waves. So far, almost all modeling works on atmospheric circulations of such giant planets have mainly considered external radiation alone, without taking into account the role of internal heat fluxes or just treating it in very simplified ways. Here, we study atmospheric circulations of strongly irradiated giant planets by considering the effect of internal forcing, which is characterized by small-scale stochastic interior thermal perturbations, using a three-dimensional atmospheric general circulation model. We show that the perturbation-excited waves can largely modify atmospheric circulation patterns in the presence of relatively strong internal forcing. Specifically, our simulations demonstrate three circulation regimes: superrotation regime, midlatitude-jet regime, and quasi-periodic oscillation regime, depending on the relative importance of external and internal forcings. It is also found that strong internal forcing can cause noticeable modifications of the thermal phase curves.

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