A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic
A regional thermohaline inverse method (RTHIM) is presented that estimates velocities through the section bounding an enclosed domain and transformation rates resulting from interior mixing within the domain, given inputs of surface boundary fluxes of heat and salt and interior distributions of sali...
Published in: | Journal of Atmospheric and Oceanic Technology |
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American Meteorological Society
2018
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_52400 2024-05-19T07:35:46+00:00 A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic Mackay, N Wilson, C Zika, J Holliday, NP 2018-12-01 application/pdf http://hdl.handle.net/1959.4/unsworks_52400 https://unsworks.unsw.edu.au/bitstreams/fe7bd4b3-ca26-4c2c-b435-bae0aa9ece3f/download https://doi.org/10.1175/JTECH-D-17-0198.1 unknown American Meteorological Society http://purl.org/au-research/grants/arc/DP160103130 http://hdl.handle.net/1959.4/unsworks_52400 https://unsworks.unsw.edu.au/bitstreams/fe7bd4b3-ca26-4c2c-b435-bae0aa9ece3f/download https://doi.org/10.1175/JTECH-D-17-0198.1 open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read urn:ISSN:0739-0572 urn:ISSN:1520-0426 Journal of Atmospheric and Oceanic Technology, 35, 12, 2383-2403 anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering journal article http://purl.org/coar/resource_type/c_6501 2018 ftunswworks https://doi.org/10.1175/JTECH-D-17-0198.1 2024-04-24T00:12:24Z A regional thermohaline inverse method (RTHIM) is presented that estimates velocities through the section bounding an enclosed domain and transformation rates resulting from interior mixing within the domain, given inputs of surface boundary fluxes of heat and salt and interior distributions of salinity and temperature. The method works by invoking a volumetric balance in thermohaline coordinates between the transformation resulting from mixing, surface fluxes, and advection, and constraining the mixing to be down tracer gradients. The method is validated using a 20-yr mean of outputs from the NEMO model in an Arctic and subpolar North Atlantic domain, bound to the south by a section with a mean latitude of 66°N. RTHIM solutions agree well with the NEMO model "truth" and are robust to a range of parameters; the meridional overturning circulation (MOC), heat, and freshwater transports calculated from an ensemble of RTHIM solutions are within 12%, 10%, and 19%, respectively, of the NEMO values. There is also bulk agreement between RTHIM solution transformation rates resulting from mixing and those diagnosed from NEMO. Localized differences in diagnosed mixing may be used to guide the development of mixing parameterizations in models such as NEMO, whose downgradient diffusive closures with prescribed diffusivity may be considered oversimplified and too restrictive. Article in Journal/Newspaper Arctic North Atlantic UNSW Sydney (The University of New South Wales): UNSWorks Journal of Atmospheric and Oceanic Technology 35 12 2383 2403 |
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Open Polar |
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UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering |
spellingShingle |
anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering Mackay, N Wilson, C Zika, J Holliday, NP A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic |
topic_facet |
anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering |
description |
A regional thermohaline inverse method (RTHIM) is presented that estimates velocities through the section bounding an enclosed domain and transformation rates resulting from interior mixing within the domain, given inputs of surface boundary fluxes of heat and salt and interior distributions of salinity and temperature. The method works by invoking a volumetric balance in thermohaline coordinates between the transformation resulting from mixing, surface fluxes, and advection, and constraining the mixing to be down tracer gradients. The method is validated using a 20-yr mean of outputs from the NEMO model in an Arctic and subpolar North Atlantic domain, bound to the south by a section with a mean latitude of 66°N. RTHIM solutions agree well with the NEMO model "truth" and are robust to a range of parameters; the meridional overturning circulation (MOC), heat, and freshwater transports calculated from an ensemble of RTHIM solutions are within 12%, 10%, and 19%, respectively, of the NEMO values. There is also bulk agreement between RTHIM solution transformation rates resulting from mixing and those diagnosed from NEMO. Localized differences in diagnosed mixing may be used to guide the development of mixing parameterizations in models such as NEMO, whose downgradient diffusive closures with prescribed diffusivity may be considered oversimplified and too restrictive. |
format |
Article in Journal/Newspaper |
author |
Mackay, N Wilson, C Zika, J Holliday, NP |
author_facet |
Mackay, N Wilson, C Zika, J Holliday, NP |
author_sort |
Mackay, N |
title |
A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic |
title_short |
A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic |
title_full |
A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic |
title_fullStr |
A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic |
title_full_unstemmed |
A regional thermohaline inverse method for estimating circulation and mixing in the Arctic and subpolar North Atlantic |
title_sort |
regional thermohaline inverse method for estimating circulation and mixing in the arctic and subpolar north atlantic |
publisher |
American Meteorological Society |
publishDate |
2018 |
url |
http://hdl.handle.net/1959.4/unsworks_52400 https://unsworks.unsw.edu.au/bitstreams/fe7bd4b3-ca26-4c2c-b435-bae0aa9ece3f/download https://doi.org/10.1175/JTECH-D-17-0198.1 |
genre |
Arctic North Atlantic |
genre_facet |
Arctic North Atlantic |
op_source |
urn:ISSN:0739-0572 urn:ISSN:1520-0426 Journal of Atmospheric and Oceanic Technology, 35, 12, 2383-2403 |
op_relation |
http://purl.org/au-research/grants/arc/DP160103130 http://hdl.handle.net/1959.4/unsworks_52400 https://unsworks.unsw.edu.au/bitstreams/fe7bd4b3-ca26-4c2c-b435-bae0aa9ece3f/download https://doi.org/10.1175/JTECH-D-17-0198.1 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read |
op_doi |
https://doi.org/10.1175/JTECH-D-17-0198.1 |
container_title |
Journal of Atmospheric and Oceanic Technology |
container_volume |
35 |
container_issue |
12 |
container_start_page |
2383 |
op_container_end_page |
2403 |
_version_ |
1799474789765611520 |