next up previous contents
Next: MULTIBEAM AND CHIRP Up: MATERIALS AND METHODS Previous: VESSEL MOUNTED ADCP   Contents

MICROSTRUCTURE TURBULENCE PROFILER

Micro-Structure Turbulence (MST) profilers from ISWW was used to provide simultaneous microstructure and precision measurements of physical parameters. The MST profiler contains two velocity microstructure shear sensors, a microstructure temperature sensor, standard CTD sensors for precision measurements and a turbidity sensor. Measurements of microscale temperature and velocity shear allows for the estimation of several turbulence-related variables including turbulent kinetic energy and temperature variance dissipation rates, and eddy diffusivities.

Measured parameters were: Pressure, CTD temperature, Conductivity, Fast temperature, Velocity shear, Turbidity. Computed parameters were: Salinity, Density, Sound velocity, Brunt-Väisälä Frequency, Seismic reflectivity, Thorpe scale (from density)[Thorpe (1977)], Ozmidov scale, Cox number, TKE dissipation rate, Thermal dissipation rate, Eddy diffusivity from dissipation, Eddy diffusivity from Cox number and Eddy diffusivity from Thorpe scale. In Table II we will present a more detailed turbulence measurements summary.

figure

Figure 12: MST turbulence measurement system.
\begin{figure}\epsfig{file=IMG/TURB_0.PS,width=0.5\linewidth}
\epsfig{file=IMG/TURB_1.PS,width=0.5\linewidth}\end{figure}
figure
Figure 13: MST turbulence measurement system.
\begin{figure}\epsfig{file=IMG/TURB_2.PS,width=0.5\linewidth}
\epsfig{file=IMG/TURB_DESCENDING.PS,width=0.5\linewidth}\end{figure}



2009-12-16