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

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

Noack, L. and Breuer, D. and Spohn, T. (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 Inc.. DOI: 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

Abstract

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.

Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Coupling the Atmosphere with Interior Dynamics: Implications for the Resurfacing of Venus
Authors:
AuthorsInstitution or Email of Authors
Noack, L.lena.noack@dlr.de
Breuer, D.doris.breuer@dlr.de
Spohn, T.Tilman.Spohn@dlr.de
Date:2012
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:217
DOI:doi:10.1016/j.icarus.2011.08.026
Page Range:pp. 484-498
Publisher:Elsevier Inc.
Status:Published
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: Lena Noack
Deposited On:28 Sep 2011 15:54
Last Modified:07 Feb 2013 20:19

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.