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Effect of mantle oxidation state and escape upon the evolution of Earth's magma ocean atmosphere | | Nisha Katyal
; Gianluigi Ortenzi
; John Lee Grenfell
; Lena Noack
; Frank Sohl
; Mareike Godolt
; Antonio García Muñoz
; Franz Schreier
; Fabian Wunderlich
; Heike Rauer
; | | Date: |
30 Sep 2020 | | Abstract: | The magma ocean period was a critical phase determining how Earth atmosphere
developed into habitability. However there are major uncertainties in the role
of key processes such as outgassing from the planetary interior and escape of
species to space that play a major role in determining the atmosphere of early
Earth. We investigate the influence of outgassing of various species and escape
of H$_2$ for different mantle redox states upon the composition and evolution
of the atmosphere for the magma ocean period. We include an important new
atmosphere-interior coupling mechanism namely the redox evolution of the mantle
which strongly affects the outgassing of species. We simulate the volatile
outgassing and chemical speciation at the surface for various redox states of
the mantle by employing a C-H-O based chemical speciation model combined with
an interior outgassing model. We then apply a line-by-line radiative transfer
model to study the remote appearance of the planet in terms of the infrared
emission and transmission. Finally, we use a parameterized diffusion-limited
and XUV energy-driven atmospheric escape model to calculate the loss of H$_2$
to space. We have simulated the thermal emission and transmission spectra for
reduced or oxidized atmospheres present during the magma ocean period of Earth.
Reduced or thin atmospheres consisting of H$_2$ in abundance emit more
radiation to space and have larger effective height as compared to oxidized or
thick atmospheres which are abundant in H$_2$O and CO$_2$. We obtain the
outgassing rates of H2 from the mantle into the atmosphere to be a factor of
ten times larger than the rates of diffusion-limited escape to space. Our work
presents useful insight into the development of Earth atmosphere during the
magma ocean period as well as input to guide future studies discussing
exoplanetary interior compositions. | | Source: | arXiv, 2009.14599 | | Services: | Forum | Review | PDF | Favorites | |
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