Diese Seite ist aus Gründen der Barrierefreiheit optimiert für aktuelle Browser. Sollten Sie einen älteren Browser verwenden, kann es zu Einschränkungen der Darstellung und Benutzbarkeit der Website kommen!
Geophysics Homepage
Log in

Polar wandering in mantle convection models

Richards, M.A., H.-P. Bunge, Y. Ricard, and J.R. Baumgardner (1999), Polar wandering in mantle convection models, Geophys. Res. Lett., 26, 1777 - 1780.

We calculate polar motion in models of 3-D spherical mantle convection at Rayleigh numbers up to 10exp8 which include internal heating, radial viscosity variations, and an endothermic phase change. Isoviscous models yield rapid polar motion of order 3 degree/Myr, but a factor of 30 increase in viscosity with depth reduces the rate of polar motion to about 0.5 degree/Myr due to stabilization of the large-scale pattern of convection. Avalanching due to an endothermic phase change causes pulsating inertial interchange polar excursions of order $80-110^o$ and of duration 20-70 Myr. A layered viscosity model with an endothermic phase change yields only one inertial interchange event in 600 million years. These models show that the slow observed rate of post-Paleozoic true polar wander is not incompatible with higher rates inferred for earlier times.
  author = {M.A. Richards and H.-P. Bunge and Y. Ricard and J.R. Baumgardner},
  journal = {Geophys. Res. Lett.},
  pages = {1777 - 1780},
  title = {{Polar wandering in mantle convection models}},
  volume = {26},
  year = {1999},
  language = {en},
%0 Journal Article
%A Richards, M.A.
%A Bunge, H.-P.
%A Ricard, Y.
%A Baumgardner, J.R.
%D 1999
%V 26
%J Geophys. Res. Lett.
%P 1777 - 1780
%T Polar wandering in mantle convection models
ImprintPrivacy PolicyContact
Printed 09. Dec 2021 03:32