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Atmospheric circulation of hot Jupiters: insensitivity to initial conditions | | Beibei Liu
; Adam P. Showman
; | | Date: |
1 Aug 2012 | | Abstract: | 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 models to initial conditions. We consider two classes
of models---shallow-water models, which have proven successful at illuminating
the dynamical mechanisms at play on these planets, and full three-dimensional
models similar to those being explored in the literature. 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. 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. | | Source: | arXiv, 1208.0126 | | Services: | Forum | Review | PDF | Favorites | |
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