Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Common 0.1 bar Tropopause in Thick Atmospheres Set by Pressure-Dependent
  Infrared Transparency   A minimum atmospheric temperature, or tropopause, occurs at a pressure of
around 0.1 bar in the atmospheres of Earth, Titan, Jupiter, Saturn, Uranus and
Neptune, despite great differences in atmospheric composition, gravity,
internal heat and sunlight. In all these bodies, the tropopause separates a
stratosphere with a temperature profile that is controlled by the absorption of
shortwave solar radiation, from a region below characterised by convection,
weather, and clouds. However, it is not obvious why the tropopause occurs at
the specific pressure near 0.1 bar. Here we use a physically-based model to
demonstrate that, at atmospheric pressures lower than 0.1 bar, transparency to
thermal radiation allows shortwave heating to dominate, creating a
stratosphere. At higher pressures, atmospheres become opaque to thermal
radiation, causing temperatures to increase with depth and convection to ensue.
A common dependence of infrared opacity on pressure, arising from the shared
physics of molecular absorption, sets the 0.1 bar tropopause. We hypothesize
that a tropopause at a pressure of approximately 0.1 bar is characteristic of
many thick atmospheres, including exoplanets and exomoons in our galaxy and
beyond. Judicious use of this rule could help constrain the atmospheric
structure, and thus the surface environments and habitability, of exoplanets.

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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg