Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific
International audience Coeval changes in atmospheric CO2 and C-14 contents during the last deglaciation are often attributed to ocean circulation changes that released carbon stored in the deep ocean during the Last Glacial Maximum (LGM). Work is being done to generate records that allow for the ide...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740/document https://hal.archives-ouvertes.fr/hal-02467740/file/2019PA003613.pdf https://doi.org/10.1029/2019PA003613 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Martínez Fontaine, Consuelo De Pol‐Holz, Ricardo Michel, Elisabeth Siani, Giuseppe Reyes‐Macaya, Dharma Martínez‐Méndez, Gema DeVries, Tim Stott, Lowell Southon, John Mohtadi, Mahyar Hebbeln, Dierk Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Coeval changes in atmospheric CO2 and C-14 contents during the last deglaciation are often attributed to ocean circulation changes that released carbon stored in the deep ocean during the Last Glacial Maximum (LGM). Work is being done to generate records that allow for the identification of the exact mechanisms leading to the accumulation and release of carbon from the oceanic reservoir, but these mechanisms are still the subject of debate. Here we present foraminifera C-14 data from five cores in a transect across the Chilean continental margin between similar to 540 and similar to 3,100 m depth spanning the last 20,000 years. Our data reveal that during the LGM, waters at similar to 2,000 m were 50% to 80% more depleted in Delta C-14 than waters at similar to 1,500 m when compared to modern values, consistent with the hypothesis of a glacial deep ocean carbon reservoir that was isolated from the atmosphere. During the deglaciation, our intermediate water records reveal homogenization in the Delta C-14 values between similar to 800 and similar to 1,500 m from similar to 16.5-14.5 ka cal BP to similar to 14-12 ka cal BP, which we interpret as deeper penetration of Antarctic Intermediate Water. While many questions still remain, this process could aid the ventilation of the deep ocean at the beginning of the deglaciation, contributing to the observed similar to 40 ppm rise in atmospheric pCO(2). |
author2 |
Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Univ Chile, Dept Geol, Santiago Univ Magallanes, Ctr Invest GAIA Antarct CIGA & Network Extreme En, Punta Arenas Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Univ Bremen, Ctr Marine Environm Sci, MARUM, Bremen Department of Atmospheric and Oceanic Sciences Los Angeles (AOS) University of California Los Angeles (UCLA) University of California-University of California Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90007 University of California Irvine (UCI) University of California Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen |
format |
Article in Journal/Newspaper |
author |
Martínez Fontaine, Consuelo De Pol‐Holz, Ricardo Michel, Elisabeth Siani, Giuseppe Reyes‐Macaya, Dharma Martínez‐Méndez, Gema DeVries, Tim Stott, Lowell Southon, John Mohtadi, Mahyar Hebbeln, Dierk |
author_facet |
Martínez Fontaine, Consuelo De Pol‐Holz, Ricardo Michel, Elisabeth Siani, Giuseppe Reyes‐Macaya, Dharma Martínez‐Méndez, Gema DeVries, Tim Stott, Lowell Southon, John Mohtadi, Mahyar Hebbeln, Dierk |
author_sort |
Martínez Fontaine, Consuelo |
title |
Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific |
title_short |
Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific |
title_full |
Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific |
title_fullStr |
Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific |
title_full_unstemmed |
Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific |
title_sort |
ventilation of the deep ocean carbon reservoir during the last deglaciation: results from the southeast pacific |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740/document https://hal.archives-ouvertes.fr/hal-02467740/file/2019PA003613.pdf https://doi.org/10.1029/2019PA003613 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 2572-4525 EISSN: 1944-9186 Paleoceanography and Paleoclimatology https://hal.archives-ouvertes.fr/hal-02467740 Paleoceanography and Paleoclimatology, American Geophysical Union, 2019, 34 (12), pp.2080-2097 (IF 2,528). ⟨10.1029/2019PA003613⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019PA003613 hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740/document https://hal.archives-ouvertes.fr/hal-02467740/file/2019PA003613.pdf doi:10.1029/2019PA003613 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019PA003613 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
12 |
container_start_page |
2080 |
op_container_end_page |
2097 |
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1766261509276565504 |
spelling |
ftccsdartic:oai:HAL:hal-02467740v1 2023-05-15T13:55:13+02:00 Ventilation of the Deep Ocean Carbon Reservoir During the Last Deglaciation: Results From the Southeast Pacific Martínez Fontaine, Consuelo De Pol‐Holz, Ricardo Michel, Elisabeth Siani, Giuseppe Reyes‐Macaya, Dharma Martínez‐Méndez, Gema DeVries, Tim Stott, Lowell Southon, John Mohtadi, Mahyar Hebbeln, Dierk Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Univ Chile, Dept Geol, Santiago Univ Magallanes, Ctr Invest GAIA Antarct CIGA & Network Extreme En, Punta Arenas Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Univ Bremen, Ctr Marine Environm Sci, MARUM, Bremen Department of Atmospheric and Oceanic Sciences Los Angeles (AOS) University of California Los Angeles (UCLA) University of California-University of California Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90007 University of California Irvine (UCI) University of California Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen 2019-12-29 https://hal.archives-ouvertes.fr/hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740/document https://hal.archives-ouvertes.fr/hal-02467740/file/2019PA003613.pdf https://doi.org/10.1029/2019PA003613 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2019PA003613 hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740 https://hal.archives-ouvertes.fr/hal-02467740/document https://hal.archives-ouvertes.fr/hal-02467740/file/2019PA003613.pdf doi:10.1029/2019PA003613 info:eu-repo/semantics/OpenAccess ISSN: 2572-4525 EISSN: 1944-9186 Paleoceanography and Paleoclimatology https://hal.archives-ouvertes.fr/hal-02467740 Paleoceanography and Paleoclimatology, American Geophysical Union, 2019, 34 (12), pp.2080-2097 (IF 2,528). ⟨10.1029/2019PA003613⟩ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1029/2019PA003613 2022-01-09T00:20:18Z International audience Coeval changes in atmospheric CO2 and C-14 contents during the last deglaciation are often attributed to ocean circulation changes that released carbon stored in the deep ocean during the Last Glacial Maximum (LGM). Work is being done to generate records that allow for the identification of the exact mechanisms leading to the accumulation and release of carbon from the oceanic reservoir, but these mechanisms are still the subject of debate. Here we present foraminifera C-14 data from five cores in a transect across the Chilean continental margin between similar to 540 and similar to 3,100 m depth spanning the last 20,000 years. Our data reveal that during the LGM, waters at similar to 2,000 m were 50% to 80% more depleted in Delta C-14 than waters at similar to 1,500 m when compared to modern values, consistent with the hypothesis of a glacial deep ocean carbon reservoir that was isolated from the atmosphere. During the deglaciation, our intermediate water records reveal homogenization in the Delta C-14 values between similar to 800 and similar to 1,500 m from similar to 16.5-14.5 ka cal BP to similar to 14-12 ka cal BP, which we interpret as deeper penetration of Antarctic Intermediate Water. While many questions still remain, this process could aid the ventilation of the deep ocean at the beginning of the deglaciation, contributing to the observed similar to 40 ppm rise in atmospheric pCO(2). Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Pacific Paleoceanography and Paleoclimatology 34 12 2080 2097 |