Computer Science
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jats...48..429r&link_type=abstract
Journal of Atmospheric Science, Vol. 48, No. 3, p. 429 - 441
Computer Science
48
Earth Atmosphere: Dynamics, Earth Atmosphere: Models
Scientific paper
The author examines the dynamics of low-frequency variability in a simple global model with zonally homogeneous boundary conditions. Low-frequency structure comprises trains of nearly equivalent barotropic Rossby waves with weak eastward phase velocities and strong eastward group velocities. These low-frequency eddies are strongly coupled to synoptic activity. The flux of vorticity by synoptic waves acts both to reinforce the low-frequency eddies and to retard their eastward propagation. Mechanistic experiments with an imposed forcing show that the synoptic-scale vorticity fluxes are organized by the low-frequency flow. The behavior is generally similar to that found in previous studies of blocks; the present work shows that strong mutual interactions between the low and synoptic frequencies also characterize less dramatic, low-frequency flows.
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