North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans
The evolution of intermediate circulation in the northern Indian Ocean since the last deglaciation has been reconstructed from two marine cores located at intermediate depths off the southern tip of India (MD77‐191) and in the northern Bay of Bengal (BoB) (MD77‐176). Benthic foraminiferal δ13C, seaw...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , , |
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Language: | English |
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American Geophysical Union (AGU)
2020
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Online Access: | https://archimer.ifremer.fr/doc/00629/74137/73603.pdf https://archimer.ifremer.fr/doc/00629/74137/73604.xlsx https://archimer.ifremer.fr/doc/00629/74137/73605.xlsx https://archimer.ifremer.fr/doc/00629/74137/73606.pdf https://doi.org/10.1029/2019PA003801 https://archimer.ifremer.fr/doc/00629/74137/ |
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ftarchimer:oai:archimer.ifremer.fr:74137 2023-05-15T13:47:36+02:00 North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Haurine, Frédéric Tisnerat‐laborde, Nadine Colin, Christophe 2020-06 application/pdf https://archimer.ifremer.fr/doc/00629/74137/73603.pdf https://archimer.ifremer.fr/doc/00629/74137/73604.xlsx https://archimer.ifremer.fr/doc/00629/74137/73605.xlsx https://archimer.ifremer.fr/doc/00629/74137/73606.pdf https://doi.org/10.1029/2019PA003801 https://archimer.ifremer.fr/doc/00629/74137/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00629/74137/73603.pdf https://archimer.ifremer.fr/doc/00629/74137/73604.xlsx https://archimer.ifremer.fr/doc/00629/74137/73605.xlsx https://archimer.ifremer.fr/doc/00629/74137/73606.pdf doi:10.1029/2019PA003801 https://archimer.ifremer.fr/doc/00629/74137/ info:eu-repo/semantics/openAccess restricted use Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2020-06 , Vol. 35 , N. 6 , P. e2019PA003801 (19p.) carbonate ion concentration benthic elemental ratios AAIW deglaciation atmospheric CO2 North Indian Ocean text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1029/2019PA003801 2021-09-23T20:35:08Z The evolution of intermediate circulation in the northern Indian Ocean since the last deglaciation has been reconstructed from two marine cores located at intermediate depths off the southern tip of India (MD77‐191) and in the northern Bay of Bengal (BoB) (MD77‐176). Benthic foraminiferal δ13C, seawater carbonate ion concentration ([CO32‐]) estimated from the Sr/Ca, and paleo‐temperature reconstructed on the basis of the Mg/Li of aragonite benthic species Hoeglundina elegans were used to trace the evolution of past intermediate‐deep water masses and to constrain ocean‐atmosphere exchanges during the two‐stage increase in atmospheric CO2 across the last deglaciation. The intermediate water [CO32‐] was mainly affected by changes in the ocean alkalinity inventory, associated with the modulation of atmospheric CO2 on glacial‐interglacial time scales. Higher benthic foraminiferal δ13C, depleted [CO32‐] and decreased Benthic‐Planktonic 14C age offsets at intermediate water depths suggest a release of deep‐sea CO2 to the atmosphere through the Antarctic Intermediate Water (AAIW) in the Southern Ocean during the 17‐15.2 and 12.6‐10.5 cal kyr BP time intervals. In addition, the decreased H. elegans Mg/Li record seems to reflect an increased contribution of cold water mass during the 17‐15.2, 12.6‐11.9 cal kyr BP intervals and throughout the Holocene. In contrast, two warm events occurred in the 15‐13.3 and 11‐10.3 cal kyr BP time intervals. During the late Holocene, a decrease in the intermediate‐water [CO32‐] indicates a contribution to atmospheric CO2 rise since 8 cal kyr BP, due to the depleted global ocean alkalinity and/or the variations in surface productivity (at least for MD77‐191). Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Indian Southern Ocean The Antarctic Paleoceanography and Paleoclimatology 35 6 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
carbonate ion concentration benthic elemental ratios AAIW deglaciation atmospheric CO2 North Indian Ocean |
spellingShingle |
carbonate ion concentration benthic elemental ratios AAIW deglaciation atmospheric CO2 North Indian Ocean Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Haurine, Frédéric Tisnerat‐laborde, Nadine Colin, Christophe North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans |
topic_facet |
carbonate ion concentration benthic elemental ratios AAIW deglaciation atmospheric CO2 North Indian Ocean |
description |
The evolution of intermediate circulation in the northern Indian Ocean since the last deglaciation has been reconstructed from two marine cores located at intermediate depths off the southern tip of India (MD77‐191) and in the northern Bay of Bengal (BoB) (MD77‐176). Benthic foraminiferal δ13C, seawater carbonate ion concentration ([CO32‐]) estimated from the Sr/Ca, and paleo‐temperature reconstructed on the basis of the Mg/Li of aragonite benthic species Hoeglundina elegans were used to trace the evolution of past intermediate‐deep water masses and to constrain ocean‐atmosphere exchanges during the two‐stage increase in atmospheric CO2 across the last deglaciation. The intermediate water [CO32‐] was mainly affected by changes in the ocean alkalinity inventory, associated with the modulation of atmospheric CO2 on glacial‐interglacial time scales. Higher benthic foraminiferal δ13C, depleted [CO32‐] and decreased Benthic‐Planktonic 14C age offsets at intermediate water depths suggest a release of deep‐sea CO2 to the atmosphere through the Antarctic Intermediate Water (AAIW) in the Southern Ocean during the 17‐15.2 and 12.6‐10.5 cal kyr BP time intervals. In addition, the decreased H. elegans Mg/Li record seems to reflect an increased contribution of cold water mass during the 17‐15.2, 12.6‐11.9 cal kyr BP intervals and throughout the Holocene. In contrast, two warm events occurred in the 15‐13.3 and 11‐10.3 cal kyr BP time intervals. During the late Holocene, a decrease in the intermediate‐water [CO32‐] indicates a contribution to atmospheric CO2 rise since 8 cal kyr BP, due to the depleted global ocean alkalinity and/or the variations in surface productivity (at least for MD77‐191). |
format |
Article in Journal/Newspaper |
author |
Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Haurine, Frédéric Tisnerat‐laborde, Nadine Colin, Christophe |
author_facet |
Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Haurine, Frédéric Tisnerat‐laborde, Nadine Colin, Christophe |
author_sort |
Ma, Ruifang |
title |
North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans |
title_short |
North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans |
title_full |
North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans |
title_fullStr |
North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans |
title_full_unstemmed |
North Indian Ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera Hoeglundina elegans |
title_sort |
north indian ocean circulation since the last deglaciation as inferred from new elemental ratio records for benthic foraminifera hoeglundina elegans |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00629/74137/73603.pdf https://archimer.ifremer.fr/doc/00629/74137/73604.xlsx https://archimer.ifremer.fr/doc/00629/74137/73605.xlsx https://archimer.ifremer.fr/doc/00629/74137/73606.pdf https://doi.org/10.1029/2019PA003801 https://archimer.ifremer.fr/doc/00629/74137/ |
geographic |
Antarctic Indian Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2020-06 , Vol. 35 , N. 6 , P. e2019PA003801 (19p.) |
op_relation |
https://archimer.ifremer.fr/doc/00629/74137/73603.pdf https://archimer.ifremer.fr/doc/00629/74137/73604.xlsx https://archimer.ifremer.fr/doc/00629/74137/73605.xlsx https://archimer.ifremer.fr/doc/00629/74137/73606.pdf doi:10.1029/2019PA003801 https://archimer.ifremer.fr/doc/00629/74137/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2019PA003801 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
6 |
_version_ |
1766247518054645760 |