GEBAUER, Stefanie; GRENFELL, John Lee; STOCK, Joachim; LEHMANN, Ralph; GODOLT, Mareike; VON PARIS, P.; RAUER, Heike

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GEBAUER, Stefanie

GRENFELL, John Lee
Extrasolare Planeten und Atmosphären [Berlin]
Zentrum für Astronomie und Astrophysik [Berlin] [ZAA]

STOCK, Joachim

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Ce document a été publié dans

19th EGU General Assembly, EGU2017, proceedings from the conference held 23-28 April, 2017 in Vienna, Austria., p.14541, 2017-04-23, Vienne. 2017-04p. 14541

Résumé en anglais

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.< Réduire

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Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804