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Characterizing horizontal variability and energy spectra in the Arctic Ocean halocline

Characterizing horizontal variability and energy spectra in the Arctic Ocean halocline
Characterizing horizontal variability and energy spectra in the Arctic Ocean halocline
Energy transfer from the atmosphere into the upper Arctic Ocean is expected to become more efficient as summer sea-ice coverage decreases and multiyear ice thins due to recent atmospheric warming. However, relatively little is known about how energy is transferred within the ocean by turbulent processes from large to small scales in the presence of ice and how these pathways might change in future. This study characterises horizontal variability in several regions of the Eurasian Arctic Ocean under differing sea-ice conditions. Historic along track CTD data collected by a Royal Navy submarine during summer 1996 allows a unique examination of horizontal variability and associated wavenumber spectra within the Arctic Ocean halocline. Spectral analysis indicates that potential energy variance under perennial sea-ice in the Amundsen Basin is O(100) less than within the Marginal Ice Zone (MIZ) of Fram Strait. Spectra from all regions show a transition in scaling at wavelengths of approximately 5 to 7 km. At scales greater than the transition wavelength to 50 km, energy spectra are consistent with a k-3 scaling (where k is wavenumber) and interior quasi-geostrophic dynamics. The scaling of spectra at these scales is extremely similar between regions suggesting similar dynamics and energy exchange pathways. The k-3 scaling is steeper than typically found in regions of mid latitude open ocean. At scales below the transition wavelength to 300 m, spectra are close to a k-5/3 scaling or flatter, indicating a change in dynamics, which is potentially due to internal waves dominating variability at small scales.
turbulence, Arctic Ocean, mesoscale, spectra
2169-9275
436-450
Marcinko, Charlotte L.J.
1fbc10e0-5c44-4cac-8a70-862ba0e47a66
Martin, Adrian P.
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Allen, John T.
17bc259e-c288-4d19-b23b-35bb3926e679
Marcinko, Charlotte L.J.
1fbc10e0-5c44-4cac-8a70-862ba0e47a66
Martin, Adrian P.
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Allen, John T.
17bc259e-c288-4d19-b23b-35bb3926e679

Marcinko, Charlotte L.J., Martin, Adrian P. and Allen, John T. (2015) Characterizing horizontal variability and energy spectra in the Arctic Ocean halocline. Journal of Geophysical Research: Oceans, 120 (1), 436-450. (doi:10.1002/2014JC010381).

Record type: Article

Abstract

Energy transfer from the atmosphere into the upper Arctic Ocean is expected to become more efficient as summer sea-ice coverage decreases and multiyear ice thins due to recent atmospheric warming. However, relatively little is known about how energy is transferred within the ocean by turbulent processes from large to small scales in the presence of ice and how these pathways might change in future. This study characterises horizontal variability in several regions of the Eurasian Arctic Ocean under differing sea-ice conditions. Historic along track CTD data collected by a Royal Navy submarine during summer 1996 allows a unique examination of horizontal variability and associated wavenumber spectra within the Arctic Ocean halocline. Spectral analysis indicates that potential energy variance under perennial sea-ice in the Amundsen Basin is O(100) less than within the Marginal Ice Zone (MIZ) of Fram Strait. Spectra from all regions show a transition in scaling at wavelengths of approximately 5 to 7 km. At scales greater than the transition wavelength to 50 km, energy spectra are consistent with a k-3 scaling (where k is wavenumber) and interior quasi-geostrophic dynamics. The scaling of spectra at these scales is extremely similar between regions suggesting similar dynamics and energy exchange pathways. The k-3 scaling is steeper than typically found in regions of mid latitude open ocean. At scales below the transition wavelength to 300 m, spectra are close to a k-5/3 scaling or flatter, indicating a change in dynamics, which is potentially due to internal waves dominating variability at small scales.

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Accepted/In Press date: January 2015
Published date: January 2015
Keywords: turbulence, Arctic Ocean, mesoscale, spectra
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 373158
URI: http://eprints.soton.ac.uk/id/eprint/373158
ISSN: 2169-9275
PURE UUID: e21fcb8d-fe8d-4869-baf4-bd649d361159
ORCID for Charlotte L.J. Marcinko: ORCID iD orcid.org/0000-0002-5369-3950

Catalogue record

Date deposited: 08 Jan 2015 13:07
Last modified: 27 Apr 2022 02:15

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Contributors

Author: Adrian P. Martin
Author: John T. Allen

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