Carbon dynamics of the Weddell Gyre, Southern Ocean
International audience The accumulation of carbon within the Weddell Gyre and its exchanges across the gyre boundaries are investigated with three recent full-depth oceanographic sections enclosing this climatically important region. The combination of carbon measurements with ocean circulation tran...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2015
|
Subjects: | |
Online Access: | https://hal.science/hal-01254978 https://hal.science/hal-01254978/document https://hal.science/hal-01254978/file/Global%20Biogeochem%20Cy_Brown_2015.pdf https://doi.org/10.1002/2014GB005006 |
id |
ftunivaixmarseil:oai:HAL:hal-01254978v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Aix-Marseille Université: HAL |
op_collection_id |
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. Jullion, Loïc Landschützer, Peter Bakker, Dorothee C. E. Naveira Garabato, Alberto C. Meredith, Michael P. Torres-Valdés, Sinhue Watson, Andrew J. Hoppema, Mario Loose, Brice Jones, Elizabeth, M. Telszewski, Maciej Jones, Steve, D. Wanninkhof, Rik Carbon dynamics of the Weddell Gyre, Southern Ocean |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The accumulation of carbon within the Weddell Gyre and its exchanges across the gyre boundaries are investigated with three recent full-depth oceanographic sections enclosing this climatically important region. The combination of carbon measurements with ocean circulation transport estimates from a box inverse analysis reveals that deepwater transports associated with Warm Deep Water (WDW) and Weddell Sea Deep Water dominate the gyre's carbon budget, while a dual-cell vertical overturning circulation leads to both upwelling and the delivery of large quantities of carbon to the deep ocean. Historical sea surface pCO 2 observations, interpolated using a neural network technique, confirm the net summertime sink of 0.044 to 0.058 ± 0.010 Pg C yr À1 derived from the inversion. However, a wintertime outgassing signal similar in size results in a statistically insignificant annual air-to-sea CO 2 flux of 0.002 ± 0.007 Pg C yr À1 (mean 1998–2011) to 0.012 ± 0.024 Pg C yr À1 (mean 2008–2010) to be diagnosed for the Weddell Gyre. A surface layer carbon balance, independently derived from in situ biogeochemical measurements, reveals that freshwater inputs and biological drawdown decrease surface ocean inorganic carbon levels more than they are increased by WDW entrainment, resulting in an estimated annual carbon sink of 0.033 ± 0.021 Pg C yr À1. Although relatively less efficient for carbon uptake than the global oceans, the summertime Weddell Gyre suppresses the winter outgassing signal, while its biological pump and deepwater formation act as key conduits for transporting natural and anthropogenic carbon to the deep ocean where they can reside for long time scales. |
author2 |
National Oceanography Centre Southampton (NOC) University of Southampton 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) Institute of Biogeochemistry and Pollutant Dynamics ETH Zürich (IBP) Department of Environmental Systems Science ETH Zürich (D-USYS) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) University of East Anglia Norwich (UEA) Nathional Oceanography Centre British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association University of Rhode Island University of Rhode Island (URI) Royal Netherlands Institute for Sea Research (NIOZ) International Ocean Carbon Coordination Project NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) National Oceanic and Atmospheric Administration (NOAA) European Project: GOCE-511176-1 |
format |
Article in Journal/Newspaper |
author |
Brown, Peter, J. Jullion, Loïc Landschützer, Peter Bakker, Dorothee C. E. Naveira Garabato, Alberto C. Meredith, Michael P. Torres-Valdés, Sinhue Watson, Andrew J. Hoppema, Mario Loose, Brice Jones, Elizabeth, M. Telszewski, Maciej Jones, Steve, D. Wanninkhof, Rik |
author_facet |
Brown, Peter, J. Jullion, Loïc Landschützer, Peter Bakker, Dorothee C. E. Naveira Garabato, Alberto C. Meredith, Michael P. Torres-Valdés, Sinhue Watson, Andrew J. Hoppema, Mario Loose, Brice Jones, Elizabeth, M. Telszewski, Maciej Jones, Steve, D. Wanninkhof, Rik |
author_sort |
Brown, Peter, J. |
title |
Carbon dynamics of the Weddell Gyre, Southern Ocean |
title_short |
Carbon dynamics of the Weddell Gyre, Southern Ocean |
title_full |
Carbon dynamics of the Weddell Gyre, Southern Ocean |
title_fullStr |
Carbon dynamics of the Weddell Gyre, Southern Ocean |
title_full_unstemmed |
Carbon dynamics of the Weddell Gyre, Southern Ocean |
title_sort |
carbon dynamics of the weddell gyre, southern ocean |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01254978 https://hal.science/hal-01254978/document https://hal.science/hal-01254978/file/Global%20Biogeochem%20Cy_Brown_2015.pdf https://doi.org/10.1002/2014GB005006 |
geographic |
Southern Ocean Weddell Sea Weddell |
geographic_facet |
Southern Ocean Weddell Sea Weddell |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_source |
ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.science/hal-01254978 Global Biogeochemical Cycles, 2015, 29, pp.288-306. ⟨10.1002/2014GB005006⟩ http://onlinelibrary.wiley.com/doi/10.1002/2014GB005006/abstract |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GB005006 info:eu-repo/grantAgreement//GOCE-511176-1/EU/CarboOcean/ hal-01254978 https://hal.science/hal-01254978 https://hal.science/hal-01254978/document https://hal.science/hal-01254978/file/Global%20Biogeochem%20Cy_Brown_2015.pdf doi:10.1002/2014GB005006 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2014GB00500610.1002/2014GB005006/abstract |
container_title |
Global Biogeochemical Cycles |
container_volume |
29 |
container_issue |
3 |
container_start_page |
288 |
op_container_end_page |
306 |
_version_ |
1790608492868927488 |
spelling |
ftunivaixmarseil:oai:HAL:hal-01254978v1 2024-02-11T10:08:52+01:00 Carbon dynamics of the Weddell Gyre, Southern Ocean Brown, Peter, J. Jullion, Loïc Landschützer, Peter Bakker, Dorothee C. E. Naveira Garabato, Alberto C. Meredith, Michael P. Torres-Valdés, Sinhue Watson, Andrew J. Hoppema, Mario Loose, Brice Jones, Elizabeth, M. Telszewski, Maciej Jones, Steve, D. Wanninkhof, Rik National Oceanography Centre Southampton (NOC) University of Southampton 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) Institute of Biogeochemistry and Pollutant Dynamics ETH Zürich (IBP) Department of Environmental Systems Science ETH Zürich (D-USYS) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) University of East Anglia Norwich (UEA) Nathional Oceanography Centre British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association University of Rhode Island University of Rhode Island (URI) Royal Netherlands Institute for Sea Research (NIOZ) International Ocean Carbon Coordination Project NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) National Oceanic and Atmospheric Administration (NOAA) European Project: GOCE-511176-1 2015-03-19 https://hal.science/hal-01254978 https://hal.science/hal-01254978/document https://hal.science/hal-01254978/file/Global%20Biogeochem%20Cy_Brown_2015.pdf https://doi.org/10.1002/2014GB005006 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GB005006 info:eu-repo/grantAgreement//GOCE-511176-1/EU/CarboOcean/ hal-01254978 https://hal.science/hal-01254978 https://hal.science/hal-01254978/document https://hal.science/hal-01254978/file/Global%20Biogeochem%20Cy_Brown_2015.pdf doi:10.1002/2014GB005006 info:eu-repo/semantics/OpenAccess ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.science/hal-01254978 Global Biogeochemical Cycles, 2015, 29, pp.288-306. ⟨10.1002/2014GB005006⟩ http://onlinelibrary.wiley.com/doi/10.1002/2014GB005006/abstract [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2015 ftunivaixmarseil https://doi.org/10.1002/2014GB00500610.1002/2014GB005006/abstract 2024-01-16T23:38:23Z International audience The accumulation of carbon within the Weddell Gyre and its exchanges across the gyre boundaries are investigated with three recent full-depth oceanographic sections enclosing this climatically important region. The combination of carbon measurements with ocean circulation transport estimates from a box inverse analysis reveals that deepwater transports associated with Warm Deep Water (WDW) and Weddell Sea Deep Water dominate the gyre's carbon budget, while a dual-cell vertical overturning circulation leads to both upwelling and the delivery of large quantities of carbon to the deep ocean. Historical sea surface pCO 2 observations, interpolated using a neural network technique, confirm the net summertime sink of 0.044 to 0.058 ± 0.010 Pg C yr À1 derived from the inversion. However, a wintertime outgassing signal similar in size results in a statistically insignificant annual air-to-sea CO 2 flux of 0.002 ± 0.007 Pg C yr À1 (mean 1998–2011) to 0.012 ± 0.024 Pg C yr À1 (mean 2008–2010) to be diagnosed for the Weddell Gyre. A surface layer carbon balance, independently derived from in situ biogeochemical measurements, reveals that freshwater inputs and biological drawdown decrease surface ocean inorganic carbon levels more than they are increased by WDW entrainment, resulting in an estimated annual carbon sink of 0.033 ± 0.021 Pg C yr À1. Although relatively less efficient for carbon uptake than the global oceans, the summertime Weddell Gyre suppresses the winter outgassing signal, while its biological pump and deepwater formation act as key conduits for transporting natural and anthropogenic carbon to the deep ocean where they can reside for long time scales. Article in Journal/Newspaper Southern Ocean Weddell Sea Aix-Marseille Université: HAL Southern Ocean Weddell Sea Weddell Global Biogeochemical Cycles 29 3 288 306 |