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Carbon cycling and interior evolution of water-covered plate tectonics and stagnant lid planets.

Höning, Dennis and Tosi, Nicola and Spohn, Tilman (2019) Carbon cycling and interior evolution of water-covered plate tectonics and stagnant lid planets. Astronomy and Astrophysics. EDP Sciences. DOI: 10.1051/0004-6361/201935091 ISSN 0004-6361

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Official URL: https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/201935091

Abstract

Aims. The long-term carbon cycle for planets with a surface entirely covered by oceans works differently from that of the present-day Earth because inefficient erosion leads to a strong dependence of the weathering rate on the rate of volcanism. In this paper, we investigate the long-term carbon cycle for these planets throughout their evolution. Methods. We built box models of the long-term carbon cycle based on CO2 degassing, seafloor-weathering, metamorphic decarbonation, and ingassing and coupled them with thermal evolution models of plate tectonics and stagnant-lid planets. Results. The assumed relationship between the seafloor-weathering rate and the atmospheric CO2 or the surface temperature strongly influences the climate evolution for both tectonic regimes. For a planet with plate tectonics, the atmospheric CO2 partial pressure is characterized by an equilibrium between ingassing and degassing and depends on the temperature gradient in subduction zones affecting the stability of carbonates. For a stagnant lid planet, partial melting and degassing are always accompanied by decarbonation, such that the combined carbon content of the crust and atmosphere increases with time. Whereas the initial mantle temperature on planets with plate tectonics only affects the early evolution, it influences the evolution of the surface temperature of stagnant-lid planets for much longer. Conclusions. For both tectonic regimes, mantle cooling results in a decreasing atmospheric CO2 partial pressure. For a planet with plate tectonics this is caused by an increasing fraction of subduction zones that avoid crustal decarbonation, and for stagnant-lid planets this is caused by an increasing decarbonation depth. This mechanism may partly compensate for the increase of the surface temperature due to increasing solar luminosity with time, and thereby contribute to keeping planets habitable in the long-term.

Item URL in elib:https://elib.dlr.de/127854/
Document Type:Article
Additional Information:Bisher nur online erschienen
Title:Carbon cycling and interior evolution of water-covered plate tectonics and stagnant lid planets.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Höning, DennisFree University AmsterdamUNSPECIFIED
Tosi, Nicolanicola.tosi (at) dlr.dehttps://orcid.org/0000-0002-4912-2848
Spohn, Tilmantilman.spohn (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1051/0004-6361/201935091
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:stagnant lid, plate tectonics, carbon cycle
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 > Leitungsbereich PF
Deposited By: Tosi, Nicola
Deposited On:14 Jun 2019 09:01
Last Modified:09 Aug 2019 08:09

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