Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release
Past changes in ocean 14C disequilibria have been suggested to reflect the Southern Ocean control on global exogenic carbon cycling. Yet, the volumetric extent of the glacial carbon pool and the deglacial mechanisms contributing to release remineralized carbon, particularly from regions with enhance...
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ftarchimer:oai:archimer.ifremer.fr:77418 2023-05-15T18:24:31+02:00 Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release Gottschalk, Julia Michel, Elisabeth Thöle, Lena M. Studer, Anja S. Hasenfratz, Adam P. Schmid, Nicole Butzin, Martin Mazaud, Alain Martínez-garcía, Alfredo Szidat, Sönke Jaccard, Samuel L. 2020-12 application/pdf https://archimer.ifremer.fr/doc/00662/77418/79081.pdf https://archimer.ifremer.fr/doc/00662/77418/79082.pdf https://archimer.ifremer.fr/doc/00662/77418/79083.pdf https://doi.org/10.1038/s41467-020-20034-1 https://archimer.ifremer.fr/doc/00662/77418/ eng eng Springer Science and Business Media LLC https://archimer.ifremer.fr/doc/00662/77418/79081.pdf https://archimer.ifremer.fr/doc/00662/77418/79082.pdf https://archimer.ifremer.fr/doc/00662/77418/79083.pdf doi:10.1038/s41467-020-20034-1 https://archimer.ifremer.fr/doc/00662/77418/ info:eu-repo/semantics/openAccess restricted use Nature Communications (2041-1723) (Springer Science and Business Media LLC), 2020-12 , Vol. 11 , N. 1 , P. 6192 (14p.) text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1038/s41467-020-20034-1 2022-10-11T22:50:26Z Past changes in ocean 14C disequilibria have been suggested to reflect the Southern Ocean control on global exogenic carbon cycling. Yet, the volumetric extent of the glacial carbon pool and the deglacial mechanisms contributing to release remineralized carbon, particularly from regions with enhanced mixing today, remain insufficiently constrained. Here, we reconstruct the deglacial ventilation history of the South Indian upwelling hotspot near Kerguelen Island, using high-resolution 14C-dating of smaller-than-conventional foraminiferal samples and multi-proxy deep-ocean oxygen estimates. We find marked regional differences in Southern Ocean overturning with distinct South Indian fingerprints on (early de-)glacial atmospheric CO2 change. The dissipation of this heterogeneity commenced 14.6 kyr ago, signaling the onset of modern-like, strong South Indian Ocean upwelling, likely promoted by rejuvenated Atlantic overturning. Our findings highlight the South Indian Ocean’s capacity to influence atmospheric CO2 levels and amplify the impacts of inter-hemispheric climate variability on global carbon cycling within centuries and millennia. Article in Journal/Newspaper Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Kerguelen Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) Southern Ocean Nature Communications 11 1 |
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 |
description |
Past changes in ocean 14C disequilibria have been suggested to reflect the Southern Ocean control on global exogenic carbon cycling. Yet, the volumetric extent of the glacial carbon pool and the deglacial mechanisms contributing to release remineralized carbon, particularly from regions with enhanced mixing today, remain insufficiently constrained. Here, we reconstruct the deglacial ventilation history of the South Indian upwelling hotspot near Kerguelen Island, using high-resolution 14C-dating of smaller-than-conventional foraminiferal samples and multi-proxy deep-ocean oxygen estimates. We find marked regional differences in Southern Ocean overturning with distinct South Indian fingerprints on (early de-)glacial atmospheric CO2 change. The dissipation of this heterogeneity commenced 14.6 kyr ago, signaling the onset of modern-like, strong South Indian Ocean upwelling, likely promoted by rejuvenated Atlantic overturning. Our findings highlight the South Indian Ocean’s capacity to influence atmospheric CO2 levels and amplify the impacts of inter-hemispheric climate variability on global carbon cycling within centuries and millennia. |
format |
Article in Journal/Newspaper |
author |
Gottschalk, Julia Michel, Elisabeth Thöle, Lena M. Studer, Anja S. Hasenfratz, Adam P. Schmid, Nicole Butzin, Martin Mazaud, Alain Martínez-garcía, Alfredo Szidat, Sönke Jaccard, Samuel L. |
spellingShingle |
Gottschalk, Julia Michel, Elisabeth Thöle, Lena M. Studer, Anja S. Hasenfratz, Adam P. Schmid, Nicole Butzin, Martin Mazaud, Alain Martínez-garcía, Alfredo Szidat, Sönke Jaccard, Samuel L. Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release |
author_facet |
Gottschalk, Julia Michel, Elisabeth Thöle, Lena M. Studer, Anja S. Hasenfratz, Adam P. Schmid, Nicole Butzin, Martin Mazaud, Alain Martínez-garcía, Alfredo Szidat, Sönke Jaccard, Samuel L. |
author_sort |
Gottschalk, Julia |
title |
Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release |
title_short |
Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release |
title_full |
Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release |
title_fullStr |
Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release |
title_full_unstemmed |
Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release |
title_sort |
glacial heterogeneity in southern ocean carbon storage abated by fast south indian deglacial carbon release |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00662/77418/79081.pdf https://archimer.ifremer.fr/doc/00662/77418/79082.pdf https://archimer.ifremer.fr/doc/00662/77418/79083.pdf https://doi.org/10.1038/s41467-020-20034-1 https://archimer.ifremer.fr/doc/00662/77418/ |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Indian Kerguelen Kerguelen Island Southern Ocean |
geographic_facet |
Indian Kerguelen Kerguelen Island Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Nature Communications (2041-1723) (Springer Science and Business Media LLC), 2020-12 , Vol. 11 , N. 1 , P. 6192 (14p.) |
op_relation |
https://archimer.ifremer.fr/doc/00662/77418/79081.pdf https://archimer.ifremer.fr/doc/00662/77418/79082.pdf https://archimer.ifremer.fr/doc/00662/77418/79083.pdf doi:10.1038/s41467-020-20034-1 https://archimer.ifremer.fr/doc/00662/77418/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41467-020-20034-1 |
container_title |
Nature Communications |
container_volume |
11 |
container_issue |
1 |
_version_ |
1766205131363188736 |