Pringle, J. M. Scripps Institution of Oceanography, pringle@poto.ucsd.edu
Franks, P. M. Scripps Institution of Oceanography, franks@spiff.ucsd.edu

 
CROSS-BANK FLOWS OF PARTICLES AND NUTRIENTS-- EXAMPLES MOTIVATED BY GEORGES BANK
 
The paths of Lagrangian particles near a tidal mixing front on a shallow bank are examined. For parameters resembling the north flank of Georges Bank, significant cross-bank transport is found in the bottom boundary layer, and along-bank winds were found to drive water from the well-mixed portion of the bank to the surface layers of the stratified water adjacent to the bank. These results are robust even when the particles are mixed vertically by the intense turbulence generated by tidal mixing on the bank. The vertical mixing driven by tides can also move particles (and thus nutrients) from the aphotic zone to the surface near the tidal front. The paths of these Lagrangian particles cannot converge or diverge because the ocean is nearly incompressible - thus the motions described above do not result in the aggregation of particles. However, if the particles are allowed to swim, sink, or float, there is aggregation of particles near the tidal front. Some examples are given for realistic parameter ranges.
 
Day: Friday, Feb. 5
Time: 11:45 - 12:00pm
Location: Eldorado Hotel
 
Code: CS57FR1145E