Physics – Geophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1265z&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1265-1268
Physics
Geophysics
1
Angular Velocity, Broken Symmetry, Convection, Geophysics, Rotation, Spherical Shells, Boundary Conditions, Boussinesq Approximation, Coriolis Effect, Stability, Streams
Scientific paper
Many problems in geophysical and astrophysical convection systems are characterized by fast rotation and spherical shell geometry. The combined effects of Coriolis forces and spherical shell geometry produce a unique spatial symmetry for the convection pattern in a rapidly rotating spherical shell. In this paper, we first discuss the general spatial symmetries for rotating spherical shell convection. A special model, a spherical shell heated from below, is then used to illustrate how and when the spatial symmetries are broken. Symmetry breaking occurs via a sequence of spatial transitions from the primary conducting state to the complex multiple-layered columnar structure. It is argued that, because of the dominant effects of rotation, the sequence of spatial transitions identified from this particular model is likely to be generally valid. Applications of the spatial symmetry breaking to planetary convection problems are also discussed.
Schubert Gerald
Zhang Keke
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