Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jats...50..631y&link_type=abstract
Journal of Atmospheric Science, Vol. 50, No. 4, p. 631 - 643
Physics
46
Scientific paper
A series of numerical experiments on the decaying two-dimensional turbulence is performed for a nondivergent barotropic fluid on a rotating sphere by using a high-resolution spectral model with a triangular truncation of T85. Temporal variations of the total kinetic energy, the total entropy, and the entropy dissipation rate are found to be influenced by both the spherical geometry and the rotation rate. The energy spectrum is different from that in the β-plane experiments with Cartesian geometry. Morphology of streamfunction and vorticity fields is investigated for several rotation rates. In nonrotational cases, isolated coherent vortices emerge in the course of time development as in the planar 2D turbulence. As the rotation rate increases, however, the temporal evolution of the flow field changes drastrically, and an easterly circumpolar vortex appears in high latitudes. The flow field is then anisotropic in all the latitudes and elongated in the longitudinal direction. Temporal evolution of the flow field is characterized by Rossby wave motions.
Yamada Mitsuru
Yoden Shigeo
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