Observations at the tidal plume front of a high-volume river outflow

Details Observations at the tidal plume front of a high-volume river outflow Observations at the tidal plume front of a high-volume river outflow

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211605o&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 11, CiteID L11605

Mathematics

Logic

20

Oceanography: Physical: Fronts And Jets, Oceanography: Physical: Fine Structure And Microstructure, Oceanography: Physical: Sediment Transport (1862), Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: Biological And Chemical: Trace Elements (0489)

Scientific paper

We present shipboard observations of very strong convergence, vertical velocities and mixing, and near-bed impacts associated with the leading-edge front of the tidally-pulsed Columbia River plume. With upwelling-favorable winds and riverflow of 4900 m3s-1, the plume propagates as a buoyant gravity current with a rotary, bore-like vertical frontal circulation and downwelling as strong as 0.35 m s-1. In waters as deep as 65 m, near-bed currents intensify to as much as 1.0 m s-1 after frontal passage, and are often associated with elevated acoustic backscatter. Mixing is locally strong, with an eddy diffusivity of O(0.2 m2s-1) 50 m behind the front, and T-S diagrams imply plume mixing with 10 m deep ocean water. These observations indicate that the leading-edge front of a surface-advected plume can cause exchanges of (a) nutrients between cold subsurface shelf waters and the river plume, and (b) nutrients and sediments across the sediment-water interface.

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