Freshwater fluxes in the Weddell Gyre: results from δ18O
Full-depth measurements of δ18O from 2008 to 2010 enclosing the Weddell Gyre in the Southern Ocean are used to investigate the regional freshwater budget. Using complementary salinity, nutrients and oxygen data, a four-component mass balance was applied to quantify the relative contributions of mete...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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ftnerc:oai:nora.nerc.ac.uk:503239 2023-05-15T13:48:07+02:00 Freshwater fluxes in the Weddell Gyre: results from δ18O Brown, Peter J. Meredith, Michael P. Jullion, Loic Naveira Garabato, Alberto Torres-Valdes, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh 2014-06-02 text http://nora.nerc.ac.uk/id/eprint/503239/ https://nora.nerc.ac.uk/id/eprint/503239/1/o18manuscript_PTRSv4_finalfigs.docx http://rsta.royalsocietypublishing.org/content/372/2019/20130298.abstract en eng Royal Society https://nora.nerc.ac.uk/id/eprint/503239/1/o18manuscript_PTRSv4_finalfigs.docx Brown, Peter J.; Meredith, Michael P. orcid:0000-0002-7342-7756 Jullion, Loic; Naveira Garabato, Alberto; Torres-Valdes, Sinhue; Holland, Paul orcid:0000-0001-8370-289X Leng, Melanie J. orcid:0000-0003-1115-5166 Venables, Hugh. 2014 Freshwater fluxes in the Weddell Gyre: results from δ18O. Philosophical Transactions of the Royal Society of London, A, 372 (2019), 20130298. https://doi.org/10.1098/rsta.2013.0298 <https://doi.org/10.1098/rsta.2013.0298> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.1098/rsta.2013.0298 2023-02-04T19:37:42Z Full-depth measurements of δ18O from 2008 to 2010 enclosing the Weddell Gyre in the Southern Ocean are used to investigate the regional freshwater budget. Using complementary salinity, nutrients and oxygen data, a four-component mass balance was applied to quantify the relative contributions of meteoric water (precipitation/glacial input), sea-ice melt and saline (oceanic) sources. Combination of freshwater fractions with velocity fields derived from a box inverse analysis enabled the estimation of gyre-scale budgets of both freshwater types, with deep water exports found to dominate the budget. Surface net sea-ice melt and meteoric contributions reach 1.8% and 3.2%, respectively, influenced by the summer sampling period, and −1.7% and +1.7% at depth, indicative of a dominance of sea-ice production over melt and a sizable contribution of shelf waters to deep water mass formation. A net meteoric water export of approximately 37 mSv is determined, commensurate with local estimates of ice sheet outflow and precipitation, and the Weddell Gyre is estimated to be a region of net sea-ice production. These results constitute the first synoptic benchmarking of sea-ice and meteoric exports from the Weddell Gyre, against which future change associated with an accelerating hydrological cycle, ocean climate change and evolving Antarctic glacial mass balance can be determined. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Sea ice Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean Weddell Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372 2019 20130298 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Full-depth measurements of δ18O from 2008 to 2010 enclosing the Weddell Gyre in the Southern Ocean are used to investigate the regional freshwater budget. Using complementary salinity, nutrients and oxygen data, a four-component mass balance was applied to quantify the relative contributions of meteoric water (precipitation/glacial input), sea-ice melt and saline (oceanic) sources. Combination of freshwater fractions with velocity fields derived from a box inverse analysis enabled the estimation of gyre-scale budgets of both freshwater types, with deep water exports found to dominate the budget. Surface net sea-ice melt and meteoric contributions reach 1.8% and 3.2%, respectively, influenced by the summer sampling period, and −1.7% and +1.7% at depth, indicative of a dominance of sea-ice production over melt and a sizable contribution of shelf waters to deep water mass formation. A net meteoric water export of approximately 37 mSv is determined, commensurate with local estimates of ice sheet outflow and precipitation, and the Weddell Gyre is estimated to be a region of net sea-ice production. These results constitute the first synoptic benchmarking of sea-ice and meteoric exports from the Weddell Gyre, against which future change associated with an accelerating hydrological cycle, ocean climate change and evolving Antarctic glacial mass balance can be determined. |
format |
Article in Journal/Newspaper |
author |
Brown, Peter J. Meredith, Michael P. Jullion, Loic Naveira Garabato, Alberto Torres-Valdes, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh |
spellingShingle |
Brown, Peter J. Meredith, Michael P. Jullion, Loic Naveira Garabato, Alberto Torres-Valdes, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh Freshwater fluxes in the Weddell Gyre: results from δ18O |
author_facet |
Brown, Peter J. Meredith, Michael P. Jullion, Loic Naveira Garabato, Alberto Torres-Valdes, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh |
author_sort |
Brown, Peter J. |
title |
Freshwater fluxes in the Weddell Gyre: results from δ18O |
title_short |
Freshwater fluxes in the Weddell Gyre: results from δ18O |
title_full |
Freshwater fluxes in the Weddell Gyre: results from δ18O |
title_fullStr |
Freshwater fluxes in the Weddell Gyre: results from δ18O |
title_full_unstemmed |
Freshwater fluxes in the Weddell Gyre: results from δ18O |
title_sort |
freshwater fluxes in the weddell gyre: results from δ18o |
publisher |
Royal Society |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/503239/ https://nora.nerc.ac.uk/id/eprint/503239/1/o18manuscript_PTRSv4_finalfigs.docx http://rsta.royalsocietypublishing.org/content/372/2019/20130298.abstract |
geographic |
Antarctic Southern Ocean Weddell |
geographic_facet |
Antarctic Southern Ocean Weddell |
genre |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/503239/1/o18manuscript_PTRSv4_finalfigs.docx Brown, Peter J.; Meredith, Michael P. orcid:0000-0002-7342-7756 Jullion, Loic; Naveira Garabato, Alberto; Torres-Valdes, Sinhue; Holland, Paul orcid:0000-0001-8370-289X Leng, Melanie J. orcid:0000-0003-1115-5166 Venables, Hugh. 2014 Freshwater fluxes in the Weddell Gyre: results from δ18O. Philosophical Transactions of the Royal Society of London, A, 372 (2019), 20130298. https://doi.org/10.1098/rsta.2013.0298 <https://doi.org/10.1098/rsta.2013.0298> |
op_doi |
https://doi.org/10.1098/rsta.2013.0298 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
372 |
container_issue |
2019 |
container_start_page |
20130298 |
_version_ |
1766248682941841408 |