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The influence of pressure-dependent viscosity on the thermal evolution of super-Earths

Stamenkovic, V. und Noack, L. und Breuer, D. und Spohn, T. (2012) The influence of pressure-dependent viscosity on the thermal evolution of super-Earths. The Astrophysical Journal, 748 (1/41), Seiten 1-22. The American Astronomical Society. DOI: doi:10.1088/0004-637X/748/1/41. ISSN 0004-637X.

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Offizielle URL: http://iopscience.iop.org/0004-637X/748/1/41/

Kurzfassung

We study the thermal evolution of super-Earths with a one-dimensional (1D) parameterized convection model that has been adopted to account for a strong pressure dependence of the viscosity. A comparison with a 2D spherical convection model shows that the derived parameterization satisfactorily represents the main characteristics of the thermal evolution of massive rocky planets. We find that the pressure dependence of the viscosity strongly influences the thermal evolution of super-Earths—resulting in a highly sluggish convection regime in the lower mantles of those planets. Depending on the effective activation volume and for cooler initial conditions, we observe with growing planetary mass even the formation of a conductive lid above the core-mantle boundary (CMB), a so-called CMB-lid. For initially molten planets our results suggest no CMB-lids but instead a hot lower mantle and core as well as sluggish lower mantle convection. This implies that the initial interior temperatures, especially in the lower mantle, become crucial for the thermal evolution—the thermostat effect suggested to regulate the interior temperatures in terrestrial planets does not work for massive planets if the viscosity is strongly pressure dependent. The sluggish convection and the potential formation of the CMB-lid reduce the convective vigor throughout the mantle, thereby affecting convective stresses, lithospheric thicknesses, and heat fluxes. The pressure dependence of the viscosity may therefore also strongly affect the propensity of plate tectonics, volcanic activity, and the generation of a magnetic field of super-Earths.

Dokumentart:Zeitschriftenbeitrag
Titel:The influence of pressure-dependent viscosity on the thermal evolution of super-Earths
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Stamenkovic, V.vlada.stamenkovic@dlr.de
Noack, L.lena.noack@dlr.de
Breuer, D.doris.breuer@dlr.de
Spohn, T.Tilman.Spohn@dlr.de
Datum:2012
Erschienen in:The Astrophysical Journal
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:748
DOI :doi:10.1088/0004-637X/748/1/41
Seitenbereich:Seiten 1-22
Verlag:The American Astronomical Society
ISSN:0004-637X
Status:veröffentlicht
Stichwörter:convection; Earth; planets and satellites: general; planets and satellites: interiors; planets and satellites: physical evolution; planets and satellites: tectonics
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Exploration des Sonnensystems (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Institut für Planetenforschung
Hinterlegt von: Lena Noack
Hinterlegt am:27 Jun 2012 14:42
Letzte Änderung:26 Mär 2013 13:39

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