A simple 1-D radiative-convective atmospheric model designed for integration into coupled models of magma ocean planets

作者：Marcq E^*

来源：Journal of Geophysical Research, 2012, 117: E01001.

DOI：10.1029/2011JE003912

In order to understand the early history of telluric interiors and atmospheres during the ocean magma stage, a coupled interior-atmosphere-escape model is being developed. This paper describes the atmospheric part and its first preliminary results. A unidimensional, radiative-convective, H(2)O-CO(2) atmosphere is modeled following a vertical T(z) profile similar to Kasting (1988) and Abe and Matsui (1988). Opacities in the thermal IR are then computed using a k-correlated code (KSPECTRUM), tabulated continuum opacities for H(2)O-H(2)O and CO(2)-CO(2) absorption, and water or sulphuric acid clouds in the moist convective zone (whenever present). The first results show the existence of two regimes depending on the relative value of the surface temperature T(s) compared to a threshold temperature T(c) depending on the total gaseous inventory. For T(s) %26lt; T(c), efficient blanketing results in a cool upper atmosphere, a cloud cover, and a long lifetime for the underneath magma ocean with a net thermal IR flux between 160 and 200 Wm(-2). For T(s) %26gt; T(c), the blanketing is not efficient enough to prevent large radiative heat loss to space through a hot, cloudless atmosphere. Our current calculations may underestimate the thermal flux in the case of hot surfaces with little gaseous content in the atmosphere.

• 出版日期2012-1-5