Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches
International audience The subtropical Indian Ocean along 32° S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (C ANT ) from five different methods: four data-base methods (ΔC*, TrOCA,...
Published in: | Biogeosciences |
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Main Authors: | , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2009
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-01205910 https://hal.archives-ouvertes.fr/hal-01205910/document https://hal.archives-ouvertes.fr/hal-01205910/file/bg-6-681-2009.pdf https://doi.org/10.5194/bg-6-681-2009 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
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[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Álvarez, M. Lo Monaco, Claire Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, John L. Goyet, Catherine Metzl, Nicolas Touratier, Franck McDonagh, E. Bryden, H. L. Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience The subtropical Indian Ocean along 32° S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (C ANT ) from five different methods: four data-base methods (ΔC*, TrOCA, TTD and IPSL) and a simulation from the OCCAM model are compared and discussed along with the observed CFC-12 and CCl 4 distributions. In the surface layer, where carbon-based methods are uncertain, TTD and OCCAM yield the same result (7±0.2 molC m−2), helping to specify the surface C ANT inventory. Below the mixed-layer, the comparison suggests that C ANT penetrates deeper and more uniformly into the Antarctic Intermediate Water layer limit than estimated from the much utilized ΔC* method. Significant CFC-12 and CCl 4 values are detected in bottom waters, associated with Antarctic Bottom Water. In this layer, except for ΔC* and OCCAM, the other methods detect significant C ANT values. Consequently, the lowest inventory is calculated using the ΔC* method (24±2 molC m−2) or OCCAM (24.4±2.8 molC m−2) while TrOCA, TTD, and IPSL lead to higher inventories (28.1±2.2, 28.9±2.3 and 30.8±2.5 molC m−2 respectively). Overall and despite the uncertainties each method is evaluated using its relationship with tracers and the knowledge about water masses in the subtropical Indian Ocean. Along 32° S our best estimate for the mean C ANT specific inventory is 28±2 molC m−2. Comparison exercises for data-based C ANT methods along with time-series or repeat sections analysis should help to identify strengths and caveats in the C ANT methods and to better constrain model simulations. |
author2 |
Institut Mediterrani d'Estudis Avancats (IMEDEA) Consejo Superior de Investigaciones Científicas Madrid (CSIC)-Universidad de las Islas Baleares (UIB) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) National Oceanography Centre Southampton (NOC) University of Southampton National Oceanic and Atmospheric Administration (NOAA) Institut de Modélisation et d'Analyses en géo-environnement et santé - Espace Développement (IMAGES-Espace DEV) UMR 228 Espace-Dev, Espace pour le développement Université de Guyane (UG)-Université des Antilles (UA)-Institut de Recherche pour le Développement (IRD)-Université de Perpignan Via Domitia (UPVD)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM)-Université de Guyane (UG)-Université des Antilles (UA)-Institut de Recherche pour le Développement (IRD)-Université de Perpignan Via Domitia (UPVD)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM) |
format |
Article in Journal/Newspaper |
author |
Álvarez, M. Lo Monaco, Claire Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, John L. Goyet, Catherine Metzl, Nicolas Touratier, Franck McDonagh, E. Bryden, H. L. |
author_facet |
Álvarez, M. Lo Monaco, Claire Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, John L. Goyet, Catherine Metzl, Nicolas Touratier, Franck McDonagh, E. Bryden, H. L. |
author_sort |
Álvarez, M. |
title |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_short |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_full |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_fullStr |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_full_unstemmed |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_sort |
estimating the storage of anthropogenic carbon in the subtropical indian ocean: a comparison of five different approaches |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-01205910 https://hal.archives-ouvertes.fr/hal-01205910/document https://hal.archives-ouvertes.fr/hal-01205910/file/bg-6-681-2009.pdf https://doi.org/10.5194/bg-6-681-2009 |
geographic |
Antarctic The Antarctic Indian |
geographic_facet |
Antarctic The Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-01205910 Biogeosciences, European Geosciences Union, 2009, 6 (4), pp.681-703. ⟨10.5194/bg-6-681-2009⟩ |
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op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-6-681-2009 |
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Biogeosciences |
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op_container_end_page |
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ftccsdartic:oai:HAL:hal-01205910v1 2023-05-15T13:43:08+02:00 Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches Álvarez, M. Lo Monaco, Claire Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, John L. Goyet, Catherine Metzl, Nicolas Touratier, Franck McDonagh, E. Bryden, H. L. Institut Mediterrani d'Estudis Avancats (IMEDEA) Consejo Superior de Investigaciones Científicas Madrid (CSIC)-Universidad de las Islas Baleares (UIB) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) National Oceanography Centre Southampton (NOC) University of Southampton National Oceanic and Atmospheric Administration (NOAA) Institut de Modélisation et d'Analyses en géo-environnement et santé - Espace Développement (IMAGES-Espace DEV) UMR 228 Espace-Dev, Espace pour le développement Université de Guyane (UG)-Université des Antilles (UA)-Institut de Recherche pour le Développement (IRD)-Université de Perpignan Via Domitia (UPVD)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM)-Université de Guyane (UG)-Université des Antilles (UA)-Institut de Recherche pour le Développement (IRD)-Université de Perpignan Via Domitia (UPVD)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM) 2009 https://hal.archives-ouvertes.fr/hal-01205910 https://hal.archives-ouvertes.fr/hal-01205910/document https://hal.archives-ouvertes.fr/hal-01205910/file/bg-6-681-2009.pdf https://doi.org/10.5194/bg-6-681-2009 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-6-681-2009 hal-01205910 https://hal.archives-ouvertes.fr/hal-01205910 https://hal.archives-ouvertes.fr/hal-01205910/document https://hal.archives-ouvertes.fr/hal-01205910/file/bg-6-681-2009.pdf doi:10.5194/bg-6-681-2009 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-01205910 Biogeosciences, European Geosciences Union, 2009, 6 (4), pp.681-703. ⟨10.5194/bg-6-681-2009⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.5194/bg-6-681-2009 2021-12-05T03:04:18Z International audience The subtropical Indian Ocean along 32° S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (C ANT ) from five different methods: four data-base methods (ΔC*, TrOCA, TTD and IPSL) and a simulation from the OCCAM model are compared and discussed along with the observed CFC-12 and CCl 4 distributions. In the surface layer, where carbon-based methods are uncertain, TTD and OCCAM yield the same result (7±0.2 molC m−2), helping to specify the surface C ANT inventory. Below the mixed-layer, the comparison suggests that C ANT penetrates deeper and more uniformly into the Antarctic Intermediate Water layer limit than estimated from the much utilized ΔC* method. Significant CFC-12 and CCl 4 values are detected in bottom waters, associated with Antarctic Bottom Water. In this layer, except for ΔC* and OCCAM, the other methods detect significant C ANT values. Consequently, the lowest inventory is calculated using the ΔC* method (24±2 molC m−2) or OCCAM (24.4±2.8 molC m−2) while TrOCA, TTD, and IPSL lead to higher inventories (28.1±2.2, 28.9±2.3 and 30.8±2.5 molC m−2 respectively). Overall and despite the uncertainties each method is evaluated using its relationship with tracers and the knowledge about water masses in the subtropical Indian Ocean. Along 32° S our best estimate for the mean C ANT specific inventory is 28±2 molC m−2. Comparison exercises for data-based C ANT methods along with time-series or repeat sections analysis should help to identify strengths and caveats in the C ANT methods and to better constrain model simulations. Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Indian Biogeosciences 6 4 681 703 |