Freshwater fluxes in the Weddell Gyre: results from δ18O
International audience 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 relativ...
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Online Access: | https://hal.science/hal-01255782 https://doi.org/10.1038/ngeo102 |
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ftunivaixmarseil:oai:HAL:hal-01255782v1 2023-12-31T10:00:37+01:00 Freshwater fluxes in the Weddell Gyre: results from δ18O Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto C. Torres-Valdés, Sinhue Holland, Paul J. Leng, Melanie Venables, Hugh University of East Anglia Norwich (UEA) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) National Oceanography Centre Southampton (NOC) University of Southampton University of Leicester 2013-06 https://hal.science/hal-01255782 https://doi.org/10.1038/ngeo102 en eng HAL CCSD American Philosophical Society info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo102 hal-01255782 https://hal.science/hal-01255782 doi:10.1038/ngeo102 ISSN: 0065-9746 Transactions- American Philosophical Society https://hal.science/hal-01255782 Transactions- American Philosophical Society, 2013, 372 (2019), pp.20130298-20130298. ⟨10.1038/ngeo102⟩ http://rsta.royalsocietypublishing.org/cgi/doi/10.1098/rsta.2013.0298 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftunivaixmarseil https://doi.org/10.1038/ngeo10210.1098/rsta.2013.0298 2023-12-05T23:46:05Z International audience 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 2 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 Aix-Marseille Université: HAL Nature Geoscience 1 2 106 110 |
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Open Polar |
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Aix-Marseille Université: HAL |
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ftunivaixmarseil |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto C. Torres-Valdés, Sinhue Holland, Paul J. Leng, Melanie Venables, Hugh Freshwater fluxes in the Weddell Gyre: results from δ18O |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience 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 2 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. |
author2 |
University of East Anglia Norwich (UEA) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) National Oceanography Centre Southampton (NOC) University of Southampton University of Leicester |
format |
Article in Journal/Newspaper |
author |
Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto C. Torres-Valdés, Sinhue Holland, Paul J. Leng, Melanie Venables, Hugh |
author_facet |
Brown, Peter J. Meredith, Michael P. Jullion, Loïc Naveira Garabato, Alberto C. Torres-Valdés, Sinhue Holland, Paul J. Leng, Melanie 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 |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-01255782 https://doi.org/10.1038/ngeo102 |
genre |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
op_source |
ISSN: 0065-9746 Transactions- American Philosophical Society https://hal.science/hal-01255782 Transactions- American Philosophical Society, 2013, 372 (2019), pp.20130298-20130298. ⟨10.1038/ngeo102⟩ http://rsta.royalsocietypublishing.org/cgi/doi/10.1098/rsta.2013.0298 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo102 hal-01255782 https://hal.science/hal-01255782 doi:10.1038/ngeo102 |
op_doi |
https://doi.org/10.1038/ngeo10210.1098/rsta.2013.0298 |
container_title |
Nature Geoscience |
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1 |
container_issue |
2 |
container_start_page |
106 |
op_container_end_page |
110 |
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1786789155950297088 |