Naveira Garabato, Alberto C., Frajka-williams, Eleanor E., Spingys, Carl P., Legg, Sonya, Polzin, Kurt L., Forryan, Alexander, Abrahamsen, E. Povl, Buckingham, Christian E., Griffies, Stephen M., Mcphail, Stephen D., Nicholls, Keith W., Thomas, Leif N. and Meredith, Michael P. (2019) Rapid mixing and exchange of deep-ocean waters in an abyssal boundary current. Proceedings of the National Academy of Sciences, 116 (27), 13233-13238. (doi:10.1073/pnas.1904087116).
Abstract
The overturning circulation of the global ocean is critically shaped by deep-ocean mixing, which transforms cold waters sinking at high latitudes into warmer, shallower waters. The effectiveness of mixing in driving this transformation is jointly set by two factors: the intensity of turbulence near topography and the rate at which well-mixed boundary waters are exchanged with the stratified ocean interior. Here, we use innovative observations of a major branch of the overturning circulation—an abyssal boundary current in the Southern Ocean—to identify a previously undocumented mixing mechanism, by which deep-ocean waters are efficiently laundered through intensified near-boundary turbulence and boundary–interior exchange. The linchpin of the mechanism is the generation of submesoscale dynamical instabilities by the flow of deep-ocean waters along a steep topographic boundary. As the conditions conducive to this mode of mixing are common to many abyssal boundary currents, our findings highlight an imperative for its representation in models of oceanic overturning.
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- Faculties (pre 2018 reorg) > Faculty of Natural and Environmental Sciences (pre 2018 reorg) > Ocean and Earth Science (pre 2018 reorg) > Physical Oceanography (pre 2018 reorg)
Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > Ocean and Earth Science (pre 2018 reorg) > Physical Oceanography (pre 2018 reorg)
School of Ocean and Earth Science > Ocean and Earth Science (pre 2018 reorg) > Physical Oceanography (pre 2018 reorg) - Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > NEXUSS CDT
School of Ocean and Earth Science > NEXUSS CDT - Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science > Physical Oceanography
School of Ocean and Earth Science > Physical Oceanography - Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Southampton Marine & Maritime Institute (pre 2018 reorg)
- Current Faculties > Faculty of Environmental and Life Sciences > School of Ocean and Earth Science
School of Ocean and Earth Science
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