Surface Wave Effects on High-Frequency Currents over a Shelf Edge Bank Public Deposited

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  • Several acoustic Doppler current profilers and vertical strings of temperature, conductivity, and pressure sensors, deployed on and around the East Flower Garden Bank (EFGB), were used to examine surface wave effects on high-frequency flows over the bank and to quantify spatial and temporal characteristic of these high-frequency flows. The EFGB, about 5-km wide and 10-km long, is located about 180-km southeast of Galveston, Texas, and consists of steep slopes on southern and eastern sides that rise from water depths over 100 m to within 20 m of the surface. Three-dimensional flows with frequencies ranging from 0.2 to 2 cycles per hour (cph) were observed in the mixed layer when wind speed and Stokes drift at the surface were large. These motions were stronger over the bank than outside the perimeter. The squared vertical velocity w² was strongest near the surface and decayed exponentially with depth, and the e-folding length of w² was 2 times larger than that of Stokes drift. The 2-h-averaged w² in the mixed layer, scaled by the squared friction velocity, was largest when the turbulent Langmuir number was less than unity and the mixed layer was shallow. It is suggested that Langmuir circulation is responsible for the generation of vertical flows in the mixed layer, and that the increase in kinetic energy is due to an enhancement of Stokes drift by wave focusing. The lack of agreement with open-ocean Langmuir scaling arguments is likely due to the enhanced kinetic energy by wave focusing.
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  • Wijesekera, H., Wang, D., Teague, W., Jarosz, E., Rogers, W., Fribance, D., & Moum, J. (2013). Surface wave effects on high-frequency currents over a shelf edge bank. Journal of Physical Oceanography, 43(8), 1627-1647. doi:10.1175/JPO-D-12-0197.1
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  • 43
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  • 8
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  • This work was sponsored by the Office of Naval Research in a Naval Research Laboratory (NRL) project referred to as ‘‘Mixing Over Rough Topography (MORT)’’ and by the Bureau of Ocean Energy Management (BOEM; formerly Minerals Management Service) in the project referred to as ‘‘Currents Over Banks (COB)’’ through the Interagency Agreement M10PG0003. Support for James Moum was provided through ONR Grant N00014-09-1-0280. The measurements weremade in cooperation with the Flower Garden Banks National Marine Sanctuary, administered by the National Oceanic and Atmospheric Administration (NOAA). Support provided by Alexis Lugo Fernandez of BOEM and Emma Hickerson of NOAA were greatly appreciated.
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