Accession Number:

AD0649762

Title:

A NUMERICAL STUDY OF TRANSIENT ROSSBY WAVES IN A WIND-DRIVEN HOMOGENEOUS OCEAN,

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CALIF

Personal Author(s):

Report Date:

1967-03-01

Pagination or Media Count:

48.0

Abstract:

The primitive hydrostatic equations for a rectangular homogeneous ocean with a free surface on a beta-plane are integrated numerically for 60 days from an initial state of rest and undisturbed depth of 400 m. A series of transient Rossby waves of approximately 2000 km length form in the central and eastern basin, and undergo a well-marked life cycle of amplification and decay as they propagate westward at about 1 msec relative to the zonal current. The northward boundary current in the west about 1 msec and the countercurrents in the northwest about 10 cmsec may be identified as the first standing members of a continuing series of transients, with subsequent waves reaching progressively smaller maximum amplitudes. These transient oceanic long waves display a meridional asymmetry or tilt characteristic of a non-linear poleward eddy transport of zonal momentum, much in the manner of their atmospheric counterparts. Near-geostrophic equilibrium is maintained throughout, with the meridional Ekman flow of the order of a few centimeters per second. Author

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE