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Forcing of the overturning circulation across a circumpolar channel by internal wave breaking

Forcing of the overturning circulation across a circumpolar channel by internal wave breaking
Forcing of the overturning circulation across a circumpolar channel by internal wave breaking
The hypothesis that the impingement of mesoscale eddy flows on small-scale topography regulates diapycnal mixing and meridional overturning across the deep Southern Ocean is assessed in an idealised model. The model simulates an eddying circumpolar current coupled to a double-celled meridional overturning with properties broadly resembling those of the Southern Ocean circulation, and represents lee wave-induced diapycnal mixing using an online formulation grounded on wave radiation theory. The diapycnal mixing generated by the simulated eddy field is found to play a major role in sustaining the lower overturning cell in the model, and to underpin a significant sensitivity of this cell to wind forcing. The vertical structure of lower overturning is set by mesoscale eddies, which propagate the effects of near-bottom diapycnal mixing by displacing isopycnals vertically.
Southern Ocean overturning, ocean dynamics, ocean models, internal lee waves, diapycnal mixing, subgrid-scale processes
5436-5451
Broadbridge, Maria B.
b2d31ca0-eebb-4a53-b1b0-e3d8d67eb683
Naveira Garabato, Alberto
97c0e923-f076-4b38-b89b-938e11cea7a6
Nurser, A.J. George
2493ef9a-21e9-4d8b-9c32-08677e7e145a
Broadbridge, Maria B.
b2d31ca0-eebb-4a53-b1b0-e3d8d67eb683
Naveira Garabato, Alberto
97c0e923-f076-4b38-b89b-938e11cea7a6
Nurser, A.J. George
2493ef9a-21e9-4d8b-9c32-08677e7e145a

Broadbridge, Maria B., Naveira Garabato, Alberto and Nurser, A.J. George (2016) Forcing of the overturning circulation across a circumpolar channel by internal wave breaking. Journal of Geophysical Research: Oceans, 121 (8), 5436-5451. (doi:10.1002/2015JC011597).

Record type: Article

Abstract

The hypothesis that the impingement of mesoscale eddy flows on small-scale topography regulates diapycnal mixing and meridional overturning across the deep Southern Ocean is assessed in an idealised model. The model simulates an eddying circumpolar current coupled to a double-celled meridional overturning with properties broadly resembling those of the Southern Ocean circulation, and represents lee wave-induced diapycnal mixing using an online formulation grounded on wave radiation theory. The diapycnal mixing generated by the simulated eddy field is found to play a major role in sustaining the lower overturning cell in the model, and to underpin a significant sensitivity of this cell to wind forcing. The vertical structure of lower overturning is set by mesoscale eddies, which propagate the effects of near-bottom diapycnal mixing by displacing isopycnals vertically.

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Accepted/In Press date: 21 June 2016
e-pub ahead of print date: 5 August 2016
Published date: 5 August 2016
Keywords: Southern Ocean overturning, ocean dynamics, ocean models, internal lee waves, diapycnal mixing, subgrid-scale processes
Organisations: Marine Systems Modelling, Physical Oceanography

Identifiers

Local EPrints ID: 397467
URI: https://eprints.soton.ac.uk/id/eprint/397467
PURE UUID: 8beaf972-1c48-433f-b501-867c88ec578e

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Date deposited: 01 Jul 2016 15:15
Last modified: 05 Mar 2019 17:32

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