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

Coupling the Atmosphere with Interior Dynamics: Implications for the Resurfacing of Venus

Noack, L. and Breuer, D. and Spohn, Tilman (2012) Coupling the Atmosphere with Interior Dynamics: Implications for the Resurfacing of Venus. Icarus: International Journal of Solar System Studies, 217 (2), pp. 484-498. Elsevier. doi: 10.1016/j.icarus.2011.08.026.

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.icarus.2011.08.026


We calculated 2D and 3D mantle convection models for Venus using digitized atmosphere temperatures from the model of Bullock and Grinspoon (2001) to study the interaction between interior dynamics and atmosphere thermal evolution. The coupling between atmosphere and interior occurs through mantle degassing and the effect of varying concentrations of the greenhouse gas H2O on the surface temperature. Exospheric loss of hydrogen to space is accounted for as a H2O sink. The surface temperature enters the mantle convection model as a boundary condition. Our results suggest a self-consistent feedback mechanism of between the interior and the atmosphere resulting in spatial-temporal surface renewal. Greenhouse warming of the atmosphere results in an increase in the surface temperature. Whenever the surface temperature reaches a critical value, the viscosity difference across the lithosphere becomes smaller than about 10^5 and the surface becomes locally mobile. The critical surface temperature depends on the activation energy for mantle creep, the stress exponent in the non-Newtonian mantle rheology law, and the mantle temperature. Surface renewal together with surface lava flow may explain why the surface of Venus is young on average, i.e. not older than a few hundred million years. The mobilization of the near-surface lithosphere increases the rate of heat removal from the mantle and thereby the interior cooling rate. The enhanced cooling results in a reduction of the water outgassing rates. As a consequence of decreasing water concentrations in the atmosphere, the surface temperature decreases. Our model calculations suggest that Venus should have been geologically active until recently. This is in agreement with several lines of observational evidence from thermal emissivity measurements and crater distribution analyses.

Item URL in elib:https://elib.dlr.de/70868/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Coupling the Atmosphere with Interior Dynamics: Implications for the Resurfacing of Venus
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Breuer, D.UNSPECIFIEDhttps://orcid.org/0000-0001-9019-5304UNSPECIFIED
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 484-498
Keywords:Venus; Venus; Atmosphere; Venus; Interior; Atmospheres; Evolution; Thermal histories
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Exploration des Sonnensystems (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research
Deposited By: Noack, Lena
Deposited On:28 Sep 2011 15:54
Last Modified:21 Nov 2023 14:23

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.