Subsurface Observations in a Wind-Driven Flow in Littoral Waters off the East Coast of Florida

Details Subsurface Observations in a Wind-Driven Flow in Littoral Waters off the East Coast of Florida Subsurface Observations in a Wind-Driven Flow in Littoral Waters off the East Coast of Florida

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmos31b0427c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #OS31B-0427

Mathematics

Logic

1724 Ocean Sciences, 4512 Currents, 4558 Sediment Transport, 4564 Tsunamis And Storm Surges, 4568 Turbulence, Diffusion, And Mixing Processes

Scientific paper

Observations of distribution of currents, temperature, salinity and density over a 1km by 0.5km spatial region in littoral waters (~20m deep) off the east coast of Florida during a passage of a low-pressure atmospheric front will be described. Meteorological and ocean surface current radar (OSCR) observations clearly show the passage of a low pressure front, during April 8-9, 2000, involving a period of warm onshore winds (~10m/s) followed by one of cold offshore winds (~14m/s) over a period of around 40 hours. Subsurface current observations from a bottom-mounted acoustic Doppler current profiler (ADCP) and from an autonomous underwater vehicle (AUV) over an 18-hour period show almost co-incident shift in current direction with the corresponding shift in the wind direction, suggesting that the currents were dominantly wind driven. Dominant currents were approximately 30 degrees to the right of the wind direction, consistent with Ekman flow. The associated magnitude of the depth of the Ekman layer and supporting temperature, salinity and water density observations from the AUV and ship-based casts will be presented. Acknowledgements: The work is part of an on-going effort, supported by ONR (Program Manager: Dr Thomas Curtin), involving AUV-based subsurface observations during adverse atmospheric conditions. Other observation elements (OSCR, bottom-mounted ADCP, moored buoys) are supported by University of Miami, NSWC, Nova Southeastern University, University of South Florida and other partners of the South Florida Ocean Measurement Center.

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