Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aipc..106..593h&link_type=abstract
AIP Conference Proceedings, Volume 106, pp. 593-599 (1984).
Physics
General Circulation, Solar System Objects, Numerical Simulation, Solution Of Equations
Scientific paper
Depending upon how one interprets ``predictability,'' planetary wave propagation may play opposing roles. In one interpretation, a difference field between two evolving flow realizations is considered. Initially confined to small scales, differences grow in scale and in amplitude until the two realizations become nearly as different as two randomly selected realizations. Predictability is thereby lost. Studies of this process in cases of barotropic motion show that planetary wave propagation inhibits growth of difference fields, thereby enhancing predictability.
A alternative view is suggested by studies of uniformly rotating, decaying barotropic turbulence in which one observes the spontaneous formation of relatively isolated, longlived vortices. The persistence of these vortices suggests a useful predictability for times longer than those times implied by measures of difference fields. However, when a mean potential vorticity gradient is imposed, planetary wave propagation may effectively prevent the formation of such isolated vortices, thereby preventing a kind of predictability associated with long-lived flow features.
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