ATMOSPHERIC CIRCULATION OF HOT JUPITERS: INSENSITIVITY TO INITIAL CONDITIONS
ATMOSPHERIC CIRCULATION OF HOT JUPITERS: INSENSITIVITY TO INITIAL CONDITIONS
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热木星的大气环流：对初始条件不敏感
DOI：
10.1088/0004-637x/770/1/42
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Showman
中科院分区：
文献类型：
--
作者：
Beibei Liu;A. Showman
对热彗星的持续描述激发了各种各样的大气环流模型。这种模式必须从一个假定的初始状态开始进行积分，该初始状态通常被认为是无风的静止状态。在这里，我们调查的敏感性热木星大气环流的初始条件与浅水模型和全三维模型。这些模型的初始化与纬向射流，我们探讨了各种不同的初始射流配置文件。我们证明，在这两类模型中，最终的平衡状态是独立的初始条件，只要摩擦阻力附近的域的底部和/或与指定的行星内部的相互作用包括在内，使大气可以调整角动量随着时间的推移相对于内部。当包括这样的机制时，否则以非常不同的初始条件初始化的相同模型都收敛到相同的统计稳态。在某些情况下，模型表现出适度的时间变异性;这种变异性导致统计稳态的随机波动，但我们强调，即使在这些情况下，统计稳态本身并不依赖于初始条件。尽管热木星环流模型的结果取决于辐射强迫和摩擦阻力的细节，其中的某些方面仍然不确定，但我们得出的结论是，初始条件的指定并不是不确定性的来源，至少在大多数当前模型中探索的参数范围内是这样。
The ongoing characterization of hot Jupiters has motivated a variety of circulation models of their atmospheres. Such models must be integrated starting from an assumed initial state, which is typically taken to be a wind-free, rest state. Here, we investigate the sensitivity of hot-Jupiter atmospheric circulation to initial conditions with shallow-water models and full three-dimensional models. Those models are initialized with zonal jets, and we explore a variety of different initial jet profiles. We demonstrate that, in both classes of models, the final, equilibrated state is independent of initial condition—as long as frictional drag near the bottom of the domain and/or interaction with a specified planetary interior are included so that the atmosphere can adjust angular momentum over time relative to the interior. When such mechanisms are included, otherwise identical models initialized with vastly different initial conditions all converge to the same statistical steady state. In some cases, the models exhibit modest time variability; this variability results in random fluctuations about the statistical steady state, but we emphasize that, even in these cases, the statistical steady state itself does not depend on initial conditions. Although the outcome of hot-Jupiter circulation models depend on details of the radiative forcing and frictional drag, aspects of which remain uncertain, we conclude that the specification of initial conditions is not a source of uncertainty, at least over the parameter range explored in most current models.
初始气流对近地行星大气环流的影响
DOI：
10.1088/0004-637x/716/1/144
发表时间：
2010
期刊：
The Astrophysical Journal
影响因子：
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作者：
Thrastarson H
通讯作者：
Thrastarson H
热行星大气流动模拟中的弛豫时间和耗散相互作用
DOI：
10.1088/0004-637x/729/2/117
发表时间：
2011
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Thrastarson H
通讯作者：
Thrastarson H