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dc.contributor.authorMackay, Neill  Concept link
dc.contributor.authorLedwell, James R.  Concept link
dc.contributor.authorMessias, Marie-Jose  Concept link
dc.contributor.authorNaveira Garabato, Alberto C.  Concept link
dc.contributor.authorBrearley, J. Alexander  Concept link
dc.contributor.authorMeijers, Andrew J. S.  Concept link
dc.contributor.authorJones, Daniel C.  Concept link
dc.contributor.authorWatson, Andrew J.  Concept link
dc.date.accessioned2018-07-05T17:15:11Z
dc.date.available2018-10-12T16:43:46Z
dc.date.issued2018-04-13
dc.identifier.citationJournal of Geophysical Research: Oceans 123 (2018): 2615-2634en_US
dc.identifier.urihttps://hdl.handle.net/1912/10451
dc.descriptionAuthor Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 2615-2634, doi:10.1002/2017JC013536.en_US
dc.description.abstractIn this work, we use realistic isopycnal velocities with a 3-D eddy diffusivity to advect and diffuse a tracer in the Antarctic Circumpolar Current, beginning in the Southeast Pacific and progressing through Drake Passage. We prescribe a diapycnal diffusivity which takes one value in the SE Pacific west of 678W and another value in Drake Passage east of that longitude, and optimize the diffusivities using a cost function to give a best fit to experimental data from the DIMES (Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean) tracer, released near the boundary between the Upper and Lower Circumpolar Deep Water. We find that diapycnal diffusivity is enhanced 20-fold in Drake Passage compared with the SE Pacific, consistent with previous estimates obtained using a simpler advection-diffusion model with constant, but different, zonal velocities east and west of 678W. Our result shows that diapycnal mixing in the ACC plays a significant role in transferring buoyancy within the Meridional Overturning Circulation.en_US
dc.description.sponsorshipUK Natural Environment Research Council Grant Numbers: NE/F020252/1 , NE/N018028/1 , NE/J007757/1; US National Science Foundation Grant Numbers: OCE 0622825 , OCE 1232962en_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2017JC013536
dc.subjectDiapycnal mixingen_US
dc.subjectOcean circulationen_US
dc.subjectTracer experimenten_US
dc.subjectOcean modelen_US
dc.titleDiapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fieldsen_US
dc.typeArticleen_US
dc.description.embargo2018-09-26en_US
dc.identifier.doi10.1002/2017JC013536


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