A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region
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 th...
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ftcdlib:oai:escholarship.org/ark:/13030/qt8rs4f57d 2023-05-15T14:01:12+02:00 A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region Chen, R Gille, ST McClean, JL Flierl, GR Griesel, A 1877 - 1896 2015-01-01 application/pdf https://escholarship.org/uc/item/8rs4f57d unknown eScholarship, University of California qt8rs4f57d https://escholarship.org/uc/item/8rs4f57d public Journal of Physical Oceanography, vol 45, iss 7 Oceanography Maritime Engineering article 2015 ftcdlib 2021-04-16T07:10:16Z 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 ° 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). Both the single-wavenumber and multiwavenumber theories represent the horizontal structures of cross-stream diffusivities, which resemble the eddy kinetic energy patterns. Article in Journal/Newspaper Antarc* Antarctica Drake Passage Southern Ocean University of California: eScholarship Drake Passage Pacific Southern Ocean |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Oceanography Maritime Engineering |
spellingShingle |
Oceanography Maritime Engineering Chen, R Gille, ST McClean, JL Flierl, GR Griesel, A A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region |
topic_facet |
Oceanography Maritime Engineering |
description |
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 ° 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). Both the single-wavenumber and multiwavenumber theories represent the horizontal structures of cross-stream diffusivities, which resemble the eddy kinetic energy patterns. |
format |
Article in Journal/Newspaper |
author |
Chen, R Gille, ST McClean, JL Flierl, GR Griesel, A |
author_facet |
Chen, R Gille, ST McClean, JL Flierl, GR Griesel, A |
author_sort |
Chen, R |
title |
A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region |
title_short |
A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region |
title_full |
A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region |
title_fullStr |
A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region |
title_full_unstemmed |
A multiwavenumber theory for eddy diffusivities and its application to the Southeast Pacific (DIMES) Region |
title_sort |
multiwavenumber theory for eddy diffusivities and its application to the southeast pacific (dimes) region |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/8rs4f57d |
op_coverage |
1877 - 1896 |
geographic |
Drake Passage Pacific Southern Ocean |
geographic_facet |
Drake Passage Pacific Southern Ocean |
genre |
Antarc* Antarctica Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctica Drake Passage Southern Ocean |
op_source |
Journal of Physical Oceanography, vol 45, iss 7 |
op_relation |
qt8rs4f57d https://escholarship.org/uc/item/8rs4f57d |
op_rights |
public |
_version_ |
1766270797072039936 |