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Analyzing early exo-Earths with a coupled atmosphere biogeochemical model

Abstract : Investigating Earth-like extrasolar planets with atmospheric models is a central focus in planetary science. Taking the development of Earth as a reference for Earth-like planets we investigate interactions between the atmosphere, planetary surface and organisms. The Great Oxidation Event (GOE) is related to feedbacks between these three. Its origin and controlling mechanisms are not well defined - requiring interdisciplinary, coupled models. We present results from our newly-developed Coupled Atmosphere Biogeochemistry (CAB) model which is unique in the literature. Applying a unique tool (Pathway Analysis Program), ours is the first quantitative analysis of catalytic cycles governing O2 in early Earth's atmosphere near the GOE. Complicated oxidation pathways play a key role in destroying O2 whereas in the upper atmosphere, most O2 is formed abiotically via CO2 photolysis.
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https://hal.archives-ouvertes.fr/hal-01523800
Contributor : Marie-Paule Pomies <>
Submitted on : Wednesday, May 17, 2017 - 8:34:08 AM
Last modification on : Friday, April 5, 2019 - 8:24:04 PM

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L3AB | CNRS | INSU

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Stefanie Gebauer, John Lee Grenfell, Joachim Stock, Ralph Lehmann, Mareike Godolt, et al.. Analyzing early exo-Earths with a coupled atmosphere biogeochemical model. 19th EGU General Assembly, EGU2017, proceedings from the conference held 23-28 April, 2017 in Vienna, Austria., p.14541, Apr 2017, Vienne, Austria. pp.14541. ⟨hal-01523800⟩

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