Rates and mechanisms of turbulent dissipation and mixing in the Southern Ocean: Results from the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) Sheen, K en_US Brearley, J en_US Garabato, A en_US Smeed, D en_US Waterman, Stephanie en_US Ledwell, J en_US Meredith, M en_US St Laurent, L en_US Thurnherr, A en_US Toole, J en_US Watson, A en_US 2021-11-25T12:30:14Z 2021-11-25T12:30:14Z 2013 en_US
dc.description.abstract The spatial distribution of turbulent dissipation rates and internal wavefield characteristics is analyzed across two contrasting regimes of the Antarctic Circumpolar Current (ACC), using microstructure and finestructure data collected as part of the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). Mid-depth turbulent dissipation rates are found to increase from O(1x10-10Wkg-1) in the Southeast Pacific to O(1x10-9Wkg-1) in the Scotia Sea, typically reaching 3x10-9Wkg-1 within a kilometer of the seabed. Enhanced levels of turbulent mixing are associated with strong near-bottom flows, rough topography, and regions where the internal wavefield is found to have enhanced energy, a less-inertial frequency content and a dominance of upward propagating energy. These results strongly suggest that bottom-generated internal waves play a major role in determining the spatial distribution of turbulent dissipation in the ACC. The energy flux associated with the bottom internal wave generation process is calculated using wave radiation theory, and found to vary between 0.8 mW m(-2) in the Southeast Pacific and 14 mW m(-2) in the Scotia Sea. Typically, 10%-30% of this energy is found to dissipate within 1 km of the seabed. Comparison between turbulent dissipation rates inferred from finestructure parameterizations and microstructure-derived estimates suggests a significant departure from wave-wave interaction physics in the near-field of wave generation sites. en_US
dc.identifier.issn 2169-9291 en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.title Rates and mechanisms of turbulent dissipation and mixing in the Southern Ocean: Results from the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) en_US
dc.type Journal Article en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.description.publisherStatement Copyright (2013) American Geophysical Union. Published version available at: en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.fundingScheme NERC, U.S. NSF en_US
unsw.relation.ispartofissue 6 en_US
unsw.relation.ispartofjournal Journal of Geophysical Research: Oceans en_US
unsw.relation.ispartofpagefrompageto 2774-2792 en_US
unsw.relation.ispartofvolume 118 en_US
unsw.relation.originalPublicationAffiliation Sheen, K en_US
unsw.relation.originalPublicationAffiliation Brearley, J en_US
unsw.relation.originalPublicationAffiliation Garabato, A en_US
unsw.relation.originalPublicationAffiliation Smeed, D en_US
unsw.relation.originalPublicationAffiliation Waterman, Stephanie, Climate Change Research Centre (CCRC), Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Ledwell, J en_US
unsw.relation.originalPublicationAffiliation Meredith, M en_US
unsw.relation.originalPublicationAffiliation St Laurent, L en_US
unsw.relation.originalPublicationAffiliation Thurnherr, A en_US
unsw.relation.originalPublicationAffiliation Toole, J en_US
unsw.relation.originalPublicationAffiliation Watson, A en_US School of Biological, Earth & Environmental Sciences *
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