HR: 1340h
AN: OS13A-0507    [Abstracts]
TI: Turbulence and Mixing in the Columbia River Plume
AU: * Kilcher, L F
EM: lkilcher@coas.oregonstate.edu
AF: College of Oceanic and Atmospheric Sciences, Oregon State University 104 COAS Admin Bldg, Corvallis, OR 97330 United States
AU: Nash, J
EM: nash@coas.oregonstate.edu
AF: College of Oceanic and Atmospheric Sciences, Oregon State University 104 COAS Admin Bldg, Corvallis, OR 97330 United States
AU: Moum, J
EM: moum@coas.oregonstate.edu
AF: College of Oceanic and Atmospheric Sciences, Oregon State University 104 COAS Admin Bldg, Corvallis, OR 97330 United States
AB: Thin bouyant plumes represent a technical challenge for in-situ observations. In July 2004 a unique set of measurements were taken in which our vertical microstructure profiler, Chameleon, and acoustics (300 kHz ADCP and 120 kHz echosounder) were modified to measure the O(1-5 m) thick plume. The Chameleon profiles included measurements of density, fluorescence, optical backscatter and turbulent energy dissipation. Intense turbulence was observed in plume fronts (with 30 m vertical displacements), at the plume base (with O(1 s$^{-1}$) shear) and in O(20 m) thick bottom boundary layers. Preliminary results from 10 days of observations will be presented and discussed.
DE: 4524 Fine structure and microstructure
DE: 4528 Fronts and jets
DE: 4568 Turbulence, diffusion, and mixing processes
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting