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Title: A Multiwavenumber Theory for Eddy Diffusivities and Its Application to the Southeast Pacific (DIMES) Region

Abstract

A multiwavenumber theory is formulated to represent eddy diffusivities. It expands on earlier single-wavenumber theories and includes the wide range of wavenumbers encompassed in eddy motions. In the limiting case in which ocean eddies are only composed of a single wavenumber, the multiwavenumber theory is equivalent to the single-wavenumber theory and both show mixing suppression by the eddy propagation relative to the mean flow. The multiwavenumber theory was tested in a region of the Southern Ocean (70°–45°S, 110°–20°W) that covers the Drake Passage and includes the tracer/float release locations during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). Cross-stream eddy diffusivities and mixing lengths were estimated in this region from the single-wavenumber theory, from the multiwavenumber theory, and from floats deployed in a global K 0° Parallel Ocean Program (POP) simulation. Compared to the single-wavenumber theory, the horizontal structures of cross-stream mixing lengths from the multiwavenumber theory agree better with the simulated float-based estimates at almost all depth levels. The multiwavenumber theory better represents the vertical structure of cross-stream mixing lengths both inside and outside the Antarctica Circumpolar Current (ACC). Finally, both the single-wavenumber and multiwavenumber theories represent the horizontal structures of cross-stream diffusivities, which resemble themore » eddy kinetic energy patterns.« less

Authors:
 [1];  [1];  [1];  [2];  [3]
  1. Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Hamburg, Hamburg (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565388
Grant/Contract Number:  
OCE0960914; TG-OCE100001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physical Oceanography
Additional Journal Information:
Journal Volume: 45; Journal Issue: 7; Journal ID: ISSN 0022-3670
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Oceanography

Citation Formats

Chen, Ru, Gille, Sarah T., McClean, Julie L., Flierl, Glenn R., and Griesel, Alexa. A Multiwavenumber Theory for Eddy Diffusivities and Its Application to the Southeast Pacific (DIMES) Region. United States: N. p., 2015. Web. doi:10.1175/jpo-d-14-0229.1.
Chen, Ru, Gille, Sarah T., McClean, Julie L., Flierl, Glenn R., & Griesel, Alexa. A Multiwavenumber Theory for Eddy Diffusivities and Its Application to the Southeast Pacific (DIMES) Region. United States. doi:10.1175/jpo-d-14-0229.1.
Chen, Ru, Gille, Sarah T., McClean, Julie L., Flierl, Glenn R., and Griesel, Alexa. Wed . "A Multiwavenumber Theory for Eddy Diffusivities and Its Application to the Southeast Pacific (DIMES) Region". United States. doi:10.1175/jpo-d-14-0229.1. https://www.osti.gov/servlets/purl/1565388.
@article{osti_1565388,
title = {A Multiwavenumber Theory for Eddy Diffusivities and Its Application to the Southeast Pacific (DIMES) Region},
author = {Chen, Ru and Gille, Sarah T. and McClean, Julie L. and Flierl, Glenn R. and Griesel, Alexa},
abstractNote = {A multiwavenumber theory is formulated to represent eddy diffusivities. It expands on earlier single-wavenumber theories and includes the wide range of wavenumbers encompassed in eddy motions. In the limiting case in which ocean eddies are only composed of a single wavenumber, the multiwavenumber theory is equivalent to the single-wavenumber theory and both show mixing suppression by the eddy propagation relative to the mean flow. The multiwavenumber theory was tested in a region of the Southern Ocean (70°–45°S, 110°–20°W) that covers the Drake Passage and includes the tracer/float release locations during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). Cross-stream eddy diffusivities and mixing lengths were estimated in this region from the single-wavenumber theory, from the multiwavenumber theory, and from floats deployed in a global K0° Parallel Ocean Program (POP) simulation. Compared to the single-wavenumber theory, the horizontal structures of cross-stream mixing lengths from the multiwavenumber theory agree better with the simulated float-based estimates at almost all depth levels. The multiwavenumber theory better represents the vertical structure of cross-stream mixing lengths both inside and outside the Antarctica Circumpolar Current (ACC). Finally, both the single-wavenumber and multiwavenumber theories represent the horizontal structures of cross-stream diffusivities, which resemble the eddy kinetic energy patterns.},
doi = {10.1175/jpo-d-14-0229.1},
journal = {Journal of Physical Oceanography},
issn = {0022-3670},
number = 7,
volume = 45,
place = {United States},
year = {2015},
month = {7}
}

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