elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Mantle redox state drives outgassing chemistry and atmospheric composition of rocky planets

Ortenzi, G. and Noack, L. and Sohl, F. and Guimond, C.M. and Grenfell, J.L. and Dorn, C. and Schmidt, J.M. and Vulpius, S. and Katyal, N. and Kitzmann, D. and Rauer, H (2020) Mantle redox state drives outgassing chemistry and atmospheric composition of rocky planets. Scientific Reports, 10 (10907), pp. 1-14. Nature Publishing Group. DOI: 10.1038/s41598-020-67751-7 ISSN 2045-2322

[img] PDF - Published version
2MB

Official URL: https://www.nature.com/articles/s41598-020-67751-7

Abstract

Volcanic degassing of planetary interiors has important implications for their corresponding atmospheres. The oxidation state of rocky interiors affects the volatile partitioning during mantle melting and subsequent volatile speciation near the surface. Here we show that the mantle redox state is central to the chemical composition of atmospheres while factors such as planetary mass, thermal state, and age mainly affect the degassing rate. We further demonstrate that mantle oxygen fugacity has an effect on atmospheric thickness and that volcanic degassing is most efficient for planets between 2 and 4 Earth masses. We show that outgassing of reduced systems is dominated by strongly reduced gases such as H2, with only smaller fractions of moderately reduced/oxidised gases (CO, H2O). Overall, a reducing scenario leads to a lower atmospheric pressure at the surface and to a larger atmospheric thickness compared to an oxidised system. Atmosphere predictions based on interior redox scenarios can be compared to observations of atmospheres of rocky exoplanets, potentially broadening our knowledge on the diversity of exoplanetary redox states.

Item URL in elib:https://elib.dlr.de/135459/
Document Type:Article
Title:Mantle redox state drives outgassing chemistry and atmospheric composition of rocky planets
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ortenzi, G.gianluigi.ortenzi (at) dlr.deUNSPECIFIED
Noack, L.Department of Earth Sciences, Freie Universitat Berlin, Malteserstraβe 74-100, 12249, Berlin, GermanyUNSPECIFIED
Sohl, F.frank.sohl (at) dlr.deUNSPECIFIED
Guimond, C.M.Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Madingley Rise, Cambridge CB3 0EZ, United KingdomUNSPECIFIED
Grenfell, J.L.lee.grenfell (at) dlr.deUNSPECIFIED
Dorn, C.Institute of Computational Sciences, University of Zurich, Winterthurerstraße 109, 8057, Zurich, SwitzerlandUNSPECIFIED
Schmidt, J.M.Department of Earth Sciences, Freie Universitat Berlin, Malteserstraβe 74-100, 12249, Berlin, GermanyUNSPECIFIED
Vulpius, S.Department of Earth Sciences, Freie Universitat Berlin, Malteserstraβe 74-100, 12249, Berlin, GermanyUNSPECIFIED
Katyal, N.Department of Astronomy and Astrophysics, Technical University of Berlin, Hardenbergstraße 36, 10623, Berlin, GermanyUNSPECIFIED
Kitzmann, D.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIED
Rauer, Hheike.rauer (at) dlr.deUNSPECIFIED
Date:2 July 2020
Journal or Publication Title:Scientific Reports
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI :10.1038/s41598-020-67751-7
Page Range:pp. 1-14
Publisher:Nature Publishing Group
ISSN:2045-2322
Status:Published
Keywords:volcanic degassing, volatile chemical speciation, mantle redox state, interior, atmosphere, composition, thermal evolution, rocky exoplanets
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Sohl, Frank
Deposited On:06 Jul 2020 10:28
Last Modified:08 Jul 2020 12:42

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.