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Dissipation processes in the Tongue of the Ocean

Title: Dissipation processes in the Tongue of the Ocean.
Name(s): Hooper, James A., author
Baringer, Molly O., author
St Laurent, Louis C., author
Dewar, William K., author
Nowacek, Doug, author
Type of Resource: text
Genre: Text
Date Issued: 2016-05
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The Tongue of the Ocean (TOTO) region located within the Bahamas archipelago is a relatively understudied region in terms of both its biological and physical oceanographic characteristics. A prey-field mapping cruise took place in the fall between 15 September 2008 and 1 October 2008, consisting of a series of transects and "clovers" to study the spatial and temporal variability. The region is characterized by a deep scattering layer (DSL), which is preyed on by nekton that serves as the food for beaked whale and other whale species. This study marks the first of its kind where concurrent measurements of acoustic backscatter and turbulence have been conducted for a nekton scattering layer well below the euphotic zone. Turbulence data collected from a Deep Microstructure Profiler are compared to biological and shear data collected by a 38 kHz Simrad EK 60 echo sounder and a hydrographic Doppler sonar system, respectively. From these measurements, the primary processes responsible for the turbulent production in the TOTO region are assessed. The DSL around 500 m and a surface scattering layer (SSL) are investigated for raised epsilon values. Strong correlation between turbulence levels and scattering intensity of prey is generally found in the SSL with dissipation levels as large as similar to 10(-7) W kg(-1), 3 orders of magnitude above background levels. In the DSL and during the diel vertical migration, dissipation levels similar to 10(-8) W kg(-1) were observed.
Identifier: FSU_libsubv1_wos_000383466500019 (IID), 10.1002/2015JC011165 (DOI)
Keywords: abyssal ocean, bahamas, deep-sea, diel vertical migration, energy, rates, turbulence, variability, zooplankton
Publication Note: The publisher’s version of record is available at
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Journal of Geophysical Research-Oceans.
Issue: iss. 5, vol. 121

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Hooper, J. A., Baringer, M. O., St Laurent, L. C., Dewar, W. K., & Nowacek, D. (2016). Dissipation processes in the Tongue of the Ocean. Journal Of Geophysical Research-Oceans. Retrieved from