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26 April 2024 |
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Article overview
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Evolution and Spectral Response of a Steam Atmosphere for Early Earth with a coupled climate-interior model | | Nisha Katyal
; Athanasia Nikolaou
; Mareike Godolt
; John Lee Grenfell
; Nicola Tosi
; Franz Schreier
; Heike Rauer
; | | Date: |
11 Mar 2019 | | Abstract: | The evolution of Earth’s early atmosphere and the emergence of habitable
conditions on our planet are intricately coupled with the development and
duration of the magma ocean phase during the early Hadean period (4 to 4.5 Ga).
In this paper, we deal with the evolution of the steam atmosphere during the
magma ocean period. We obtain the outgoing longwave radiation using a
line-by-line radiative transfer code GARLIC. Our study suggests that an
atmosphere consisting of pure H$_{2}$O, built as a result of outgassing extends
the magma ocean lifetime to several million years. The thermal emission as a
function of solidification timescale of magma ocean is shown. We study the
effect of thermal dissociation of H$_{2}$O at higher temperatures by applying
atmospheric chemical equilibrium which results in the formation of H$_{2}$ and
O$_{2}$ during the early phase of the magma ocean. A 1-6\% reduction in the OLR
is seen. We also obtain the effective height of the atmosphere by calculating
the transmission spectra for the whole duration of the magma ocean. An
atmosphere of depth ~100 km is seen for pure water atmospheres. The effect of
thermal dissociation on the effective height of the atmosphere is also shown.
Due to the difference in the absorption behavior at different altitudes, the
spectral features of H$_{2}$ and O$_{2}$ are seen at different altitudes of the
atmosphere. Therefore, these species along with H$_{2}$O have a significant
contribution to the transmission spectra and could be useful for placing
observational constraints upon magma ocean exoplanets. | | Source: | arXiv, 1903.4623 | | Services: | Forum | Review | PDF | Favorites | |
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