A dye tracer reveals cross-shelf dispersion and interleaving on the Oregon shelf

Details A dye tracer reveals cross-shelf dispersion and interleaving on the Oregon shelf A dye tracer reveals cross-shelf dispersion and interleaving on the Oregon shelf

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3303604d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 3, CiteID L03604

Other

3

Oceanography: General: Continental Shelf And Slope Processes (3002), Oceanography: Physical: Fine Structure And Microstructure, Oceanography: Physical: Hydrography And Tracers, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490)

Scientific paper

A fluorescent dye tracer was injected into the pycnocline on the Oregon shelf at a depth of 9-10 m. It spread rapidly cross-shelf as two distinct layers, one above the other in the water column, split by interleaving dye-free water. The vertical scale of these layers, and associated density steps, was 1-2 m, and the horizontal extent of interleaving exceeded 1.6 km after an inertial period. The upper dye layer was sharply peaked and embedded in a strong vertical density gradient. The lower layer was slab-like and associated with weak stratification. Both layers were inclined slightly in density space. It is proposed that internal wave-induced mixing and the lateral collapse of mixing patches were important mechanisms. Analogies can be drawn between these dye structures and frequently-observed thin planktonic layers. By approximating the dye dispersion as a Fickian process, estimated isopycnal and diapycnal eddy diffusivities of $\kappa$x = 4.1 m2 s-1 and $\kappa$z = 1.4 × 10-5 m2 s-1 are obtained.

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