Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields
Author 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. In th...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10451 2023-05-15T13:48:31+02:00 Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields Mackay, Neill Ledwell, James R. Messias, Marie-Jose Naveira Garabato, Alberto C. Brearley, J. Alexander Meijers, Andrew J. S. Jones, Daniel C. Watson, Andrew J. 2018-04-13 https://hdl.handle.net/1912/10451 en_US eng John Wiley & Sons https://doi.org/10.1002/2017JC013536 Journal of Geophysical Research: Oceans 123 (2018): 2615-2634 https://hdl.handle.net/1912/10451 doi:10.1002/2017JC013536 Journal of Geophysical Research: Oceans 123 (2018): 2615-2634 doi:10.1002/2017JC013536 Diapycnal mixing Ocean circulation Tracer experiment Ocean model Article 2018 ftwhoas https://doi.org/10.1002/2017JC013536 2022-05-28T23:00:25Z Author 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. In 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. UK Natural Environment Research Council Grant Numbers: NE/F020252/1 , NE/N018028/1 , NE/J007757/1; US National Science Foundation Grant Numbers: OCE 0622825 , OCE 1232962 2018-09-26 Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Drake Passage Pacific Southern Ocean The Antarctic Journal of Geophysical Research: Oceans 123 4 2615 2634 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Diapycnal mixing Ocean circulation Tracer experiment Ocean model |
spellingShingle |
Diapycnal mixing Ocean circulation Tracer experiment Ocean model Mackay, Neill Ledwell, James R. Messias, Marie-Jose Naveira Garabato, Alberto C. Brearley, J. Alexander Meijers, Andrew J. S. Jones, Daniel C. Watson, Andrew J. Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields |
topic_facet |
Diapycnal mixing Ocean circulation Tracer experiment Ocean model |
description |
Author 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. In 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. UK Natural Environment Research Council Grant Numbers: NE/F020252/1 , NE/N018028/1 , NE/J007757/1; US National Science Foundation Grant Numbers: OCE 0622825 , OCE 1232962 2018-09-26 |
format |
Article in Journal/Newspaper |
author |
Mackay, Neill Ledwell, James R. Messias, Marie-Jose Naveira Garabato, Alberto C. Brearley, J. Alexander Meijers, Andrew J. S. Jones, Daniel C. Watson, Andrew J. |
author_facet |
Mackay, Neill Ledwell, James R. Messias, Marie-Jose Naveira Garabato, Alberto C. Brearley, J. Alexander Meijers, Andrew J. S. Jones, Daniel C. Watson, Andrew J. |
author_sort |
Mackay, Neill |
title |
Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields |
title_short |
Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields |
title_full |
Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields |
title_fullStr |
Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields |
title_full_unstemmed |
Diapycnal mixing in the Southern Ocean diagnosed using the DIMES tracer and realistic velocity fields |
title_sort |
diapycnal mixing in the southern ocean diagnosed using the dimes tracer and realistic velocity fields |
publisher |
John Wiley & Sons |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/10451 |
geographic |
Antarctic Drake Passage Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
Journal of Geophysical Research: Oceans 123 (2018): 2615-2634 doi:10.1002/2017JC013536 |
op_relation |
https://doi.org/10.1002/2017JC013536 Journal of Geophysical Research: Oceans 123 (2018): 2615-2634 https://hdl.handle.net/1912/10451 doi:10.1002/2017JC013536 |
op_doi |
https://doi.org/10.1002/2017JC013536 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
4 |
container_start_page |
2615 |
op_container_end_page |
2634 |
_version_ |
1766249350098321408 |