Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean.
Article © Copyright 2015 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” un...
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ftunivexeter:oai:ore.exeter.ac.uk:10871/17645 2023-05-15T13:55:51+02:00 Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. Watson, Andrew J. Boland, EJD Shuckburgh, E Haynes, PH Ledwell, JR Messias, MJ 2015 http://hdl.handle.net/10871/17645 https://doi.org/10.1175/JPO-D-14-0047.1 en eng American Meteorological Society http://journals.ametsoc.org/doi/abs/10.1175/JPO-D-14-0047.1 Vol. 45, No. 6, pp. 1610-1631 http://dx.doi.org/10.1175/JPO-D-14-0047.1 http://hdl.handle.net/10871/17645 1520-0485 Journal of Physical Oceanography 2016-01-01 Publisher's policy Geographic location/entity Southern Ocean Circulation/ Dynamics Diffusion Physical Meteorology and Climatology Isopycnal mixing Observational techniques and algorithms Tracers Models and modeling Model comparison Article 2015 ftunivexeter https://doi.org/10.1175/JPO-D-14-0047.1 2022-11-20T21:31:03Z Article © Copyright 2015 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org. The use of a measure to diagnose submesoscale isopycnal diffusivity by determining the best match between observations of a tracer and simulations with varying small-scale diffusivities is tested. Specifically, the robustness of a “roughness” measure to discriminate between tracer fields experiencing different submesoscale isopycnal diffusivities and advected by scaled altimetric velocity fields is investigated. This measure is used to compare numerical simulations of the tracer released at a depth of about 1.5 km in the Pacific sector of the Southern Ocean during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) field campaign with observations of the tracer taken on DIMES cruises. The authors find that simulations with an isopycnal diffusivity of ~20 m2 s−1 best match observations in the Pacific sector of the Antarctic Circumpolar Current (ACC), rising to ~20–50 m2 s−1 through Drake Passage, representing submesoscale processes and any mesoscale processes unresolved by the advecting altimetry fields. The roughness measure is ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean University of Exeter: Open Research Exeter (ORE) Antarctic Drake Passage Pacific Southern Ocean The Antarctic Journal of Physical Oceanography 45 6 1610 1631 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
topic |
Geographic location/entity Southern Ocean Circulation/ Dynamics Diffusion Physical Meteorology and Climatology Isopycnal mixing Observational techniques and algorithms Tracers Models and modeling Model comparison |
spellingShingle |
Geographic location/entity Southern Ocean Circulation/ Dynamics Diffusion Physical Meteorology and Climatology Isopycnal mixing Observational techniques and algorithms Tracers Models and modeling Model comparison Watson, Andrew J. Boland, EJD Shuckburgh, E Haynes, PH Ledwell, JR Messias, MJ Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. |
topic_facet |
Geographic location/entity Southern Ocean Circulation/ Dynamics Diffusion Physical Meteorology and Climatology Isopycnal mixing Observational techniques and algorithms Tracers Models and modeling Model comparison |
description |
Article © Copyright 2015 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org. The use of a measure to diagnose submesoscale isopycnal diffusivity by determining the best match between observations of a tracer and simulations with varying small-scale diffusivities is tested. Specifically, the robustness of a “roughness” measure to discriminate between tracer fields experiencing different submesoscale isopycnal diffusivities and advected by scaled altimetric velocity fields is investigated. This measure is used to compare numerical simulations of the tracer released at a depth of about 1.5 km in the Pacific sector of the Southern Ocean during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) field campaign with observations of the tracer taken on DIMES cruises. The authors find that simulations with an isopycnal diffusivity of ~20 m2 s−1 best match observations in the Pacific sector of the Antarctic Circumpolar Current (ACC), rising to ~20–50 m2 s−1 through Drake Passage, representing submesoscale processes and any mesoscale processes unresolved by the advecting altimetry fields. The roughness measure is ... |
format |
Article in Journal/Newspaper |
author |
Watson, Andrew J. Boland, EJD Shuckburgh, E Haynes, PH Ledwell, JR Messias, MJ |
author_facet |
Watson, Andrew J. Boland, EJD Shuckburgh, E Haynes, PH Ledwell, JR Messias, MJ |
author_sort |
Watson, Andrew J. |
title |
Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. |
title_short |
Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. |
title_full |
Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. |
title_fullStr |
Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. |
title_full_unstemmed |
Determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the Southern Ocean. |
title_sort |
determining a sub-mesoscale diffusivity using a roughness measure applied to a tracer release experiment in the southern ocean. |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
http://hdl.handle.net/10871/17645 https://doi.org/10.1175/JPO-D-14-0047.1 |
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_relation |
http://journals.ametsoc.org/doi/abs/10.1175/JPO-D-14-0047.1 Vol. 45, No. 6, pp. 1610-1631 http://dx.doi.org/10.1175/JPO-D-14-0047.1 http://hdl.handle.net/10871/17645 1520-0485 Journal of Physical Oceanography |
op_rights |
2016-01-01 Publisher's policy |
op_doi |
https://doi.org/10.1175/JPO-D-14-0047.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
45 |
container_issue |
6 |
container_start_page |
1610 |
op_container_end_page |
1631 |
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1766262749239705600 |