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...
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ftpubmed:oai:pubmedcentral.nih.gov:4032514 2023-05-15T14:00:20+02:00 Freshwater fluxes in the Weddell Gyre: results from δ18O Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto Torres-Valdés, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh 2014-07-13 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4032514/ http://www.ncbi.nlm.nih.gov/pubmed/24891394 https://doi.org/10.1098/rsta.2013.0298 en eng The Royal Society Publishing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4032514/ http://www.ncbi.nlm.nih.gov/pubmed/24891394 http://dx.doi.org/10.1098/rsta.2013.0298 © 2014 The Author(s) Published by the Royal Society. All rights reserved. Articles Text 2014 ftpubmed https://doi.org/10.1098/rsta.2013.0298 2015-07-19T00:52:42Z 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. Text Antarc* Antarctic Ice Sheet Sea ice Southern Ocean PubMed Central (PMC) Antarctic Southern Ocean Weddell Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372 2019 20130298 |
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Articles Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto Torres-Valdés, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh Freshwater fluxes in the Weddell Gyre: results from δ18O |
topic_facet |
Articles |
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 |
Text |
author |
Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto Torres-Valdés, Sinhue Holland, Paul Leng, Melanie J. Venables, Hugh |
author_facet |
Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto Torres-Valdés, 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 |
The Royal Society Publishing |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4032514/ http://www.ncbi.nlm.nih.gov/pubmed/24891394 https://doi.org/10.1098/rsta.2013.0298 |
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 |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4032514/ http://www.ncbi.nlm.nih.gov/pubmed/24891394 http://dx.doi.org/10.1098/rsta.2013.0298 |
op_rights |
© 2014 The Author(s) Published by the Royal Society. All rights reserved. |
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_ |
1766269381621317632 |