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Turbulent Dissipation in the Mid-Latitude Mixed Layer/Thermocline Transition Layer

Title: Turbulent Dissipation in the Mid-Latitude Mixed Layer/Thermocline Transition Layer.
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Name(s): Rahter, Bryan, author
Clayson, Carol Anne, professor directing thesis
Laurent, Louis St., committee member
Dewar, William K., committee member
Froelich, Philip N., committee member
Department of Earth, Ocean and Atmospheric Sciences, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2010
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The oceanic mixed layer is a region of intense mixing, where turbulence homogenizes vertical temperature and salinity distributions down to depths of O(100) m. Below the mixed layer, in the upper layers of the stratified thermocline, turbulent energy levels are greatly reduced. The transition between these two regions is the focus of this investigation. Traditionally, this transition is assumed to take place abruptly at the mixed-layer base. However, observations suggest that enhanced turbulence penetrates significantly into the stratified water below the mixed layer. Here, I present an examination of existing turbulence data documenting open ocean conditions with steady wind forcing in both the sub-tropical Atlantic and Pacific. These data will allow for direct estimates of diffusivity and diapycnal flux occurring in the mixed layer/thermocline transition layer. This analysis establishes statistics for turbulence dissipation levels occurring just below the well-mixed layer, which have not been previously documented. My investigation suggests that while the transition layer thickness can vary considerably (from O(10) to O(100) m for my data), the diabatic fluxes in this region, as measured by the turbulent dissipation rate, are 4-8 times greater than in the thermocline under typical surface forcing conditions.
Identifier: FSU_migr_etd-2181 (IID)
Submitted Note: A Thesis submitted to the Department of Oceanography in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Summer Semester, 2010.
Date of Defense: April 29, 2010.
Keywords: Dissipation, One-dimensional Models, Turbulence, Transition Layer, Surface Ocean
Bibliography Note: Includes bibliographical references.
Advisory Committee: Carol Anne Clayson, Professor Directing Thesis; Louis St. Laurent, Committee Member; William K. Dewar, Committee Member; Philip N. Froelich, Committee Member.
Subject(s): Oceanography
Atmospheric sciences
Meteorology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2181
Owner Institution: FSU

Choose the citation style.
Rahter, B. (2010). Turbulent Dissipation in the Mid-Latitude Mixed Layer/Thermocline Transition Layer. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-2181