arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1812.02451astro-ph.EP
收藏

温暖、缓慢旋转的小海王星和超级地球的原始动力学方程的极限

The Limits of the Primitive Equations of Dynamics for Warm, Slowly Rotating Small Neptunes and Super Earths

N. J. Mayne, B. Drummond, F. Debras, E. Jaupart, J. Manners, I. A. Boutle, I. Baraffe, K. Kohary

摘要:

我们提出了显着的差异,在模拟大气流动温暖,潮汐锁定的小海王星和超级地球(基于名义GJ 1214 b)时,解决简化的,常用的,原始的动力学方程或完整的纳维-斯托克斯方程。在同一个模型中,使用几乎相同的数值设置进行的模拟之间的主导的超旋转纬向射流是显着不同的。这种差异是由于所谓的“浅流体”和传统近似法的崩溃而产生的,当旋转速度减慢时,这种近似法就会崩溃,昼夜温度对比就会增加。模拟求解完整和简化方程之间的纬向平流的变化导致大气热量再分配的显着差异,改变了大气中最热部分的位置以及昼夜之间的温度对比。对大气化学的影响,因此,观测需要研究一个模型,包括一个更详细的处理辐射转移和化学。小海王星和超级地球是非常丰富和重要的,潜在的桥梁的结构特性(质量,半径,组成)的陆地和气体巨行星。我们的研究结果表明,在解释这些行星的原始运动方程模型的输出时,需要小心。

英文摘要:

We present significant differences in the simulated atmospheric flow for warm, tidally-locked small Neptunes and super Earths (based on a nominal GJ 1214b) when solving the simplified, and commonly used, primitive dynamical equations or the full Navier-Stokes equations. The dominant prograde, superrotating zonal jet is markedly different between the simulations which are performed using practically identical numerical setups, within the same model. The differences arise due to the breakdown of the so-called `shallow-fluid' and traditional approximations, which worsens when rotation rates are slowed, and day-night temperature contrasts are increased. The changes in the zonal advection between simulations solving the full and simplified equations, give rise to significant differences in the atmospheric redistribution of heat, altering the position of the hottest part of the atmosphere and temperature contrast between the day and night sides. The implications for the atmospheric chemistry and, therefore, observations need to be studied with a model including a more detailed treatment of the radiative transfer and chemistry. Small Neptunes and super Earths are extremely abundant and important, potentially bridging the structural properties (mass, radius, composition) of terrestrial and gas giant planets. Our results indicate care is required when interpreting the output of models solving the primitive equations of motion for such planets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑