The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean
During the early part of the last glacial termination (17.2-15 ka) and coincident with a ∼ 35 ppm rise in atmospheric CO2, a sharp 0.3‰-0.4‰ decline in atmospheric δ13CO2 occurred, potentially constraining the key processes that account for the early deglacial CO2 rise. A comparable δ13C decline has...
Published in: | Climate of the Past |
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Copernicus Publications (EGU)
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/53659/ https://oceanrep.geomar.de/id/eprint/53659/1/cp-17-1507-2021.pdf https://oceanrep.geomar.de/id/eprint/53659/2/cp-17-1507-2021-supplement.pdf https://doi.org/10.5194/cp-17-1507-2021 |
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ftoceanrep:oai:oceanrep.geomar.de:53659 2024-02-11T10:08:51+01:00 The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean Shao, Jun Stott, Lowell D. Menviel, Laurie Ridgwell, Andy Ödalen, Malin Mohtadi, Mayhar 2021-07-19 text https://oceanrep.geomar.de/id/eprint/53659/ https://oceanrep.geomar.de/id/eprint/53659/1/cp-17-1507-2021.pdf https://oceanrep.geomar.de/id/eprint/53659/2/cp-17-1507-2021-supplement.pdf https://doi.org/10.5194/cp-17-1507-2021 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/53659/1/cp-17-1507-2021.pdf https://oceanrep.geomar.de/id/eprint/53659/2/cp-17-1507-2021-supplement.pdf Shao, J. , Stott, L. D., Menviel, L. , Ridgwell, A., Ödalen, M. and Mohtadi, M. (2021) The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean. Open Access Climate of the Past, 17 (4). pp. 1507-1521. DOI 10.5194/cp-17-1507-2021 <https://doi.org/10.5194/cp-17-1507-2021>. doi:10.5194/cp-17-1507-2021 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.5194/cp-17-1507-2021 2024-01-15T00:23:45Z During the early part of the last glacial termination (17.2-15 ka) and coincident with a ∼ 35 ppm rise in atmospheric CO2, a sharp 0.3‰-0.4‰ decline in atmospheric δ13CO2 occurred, potentially constraining the key processes that account for the early deglacial CO2 rise. A comparable δ13C decline has also been documented in numerous marine proxy records from surface and thermocline-dwelling planktic foraminifera. The δ13C decline recorded in planktic foraminifera has previously been attributed to the release of respired carbon from the deep ocean that was subsequently transported within the upper ocean to sites where the signal was recorded (and then ultimately transferred to the atmosphere). Benthic δ13C records from the global upper ocean, including a new record presented here from the tropical Pacific, also document this distinct early deglacial δ13C decline. Here we present modeling evidence to show that rather than respired carbon from the deep ocean propagating directly to the upper ocean prior to reaching the atmosphere, the carbon would have first upwelled to the surface in the Southern Ocean where it would have entered the atmosphere. In this way the transmission of isotopically light carbon to the global upper ocean was analogous to the ongoing ocean invasion of fossil fuel CO2. The model results suggest that thermocline waters throughout the ocean and 500-2000m water depths were affected by this atmospheric bridge during the early deglaciation. Article in Journal/Newspaper Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Southern Ocean Climate of the Past 17 4 1507 1521 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
During the early part of the last glacial termination (17.2-15 ka) and coincident with a ∼ 35 ppm rise in atmospheric CO2, a sharp 0.3‰-0.4‰ decline in atmospheric δ13CO2 occurred, potentially constraining the key processes that account for the early deglacial CO2 rise. A comparable δ13C decline has also been documented in numerous marine proxy records from surface and thermocline-dwelling planktic foraminifera. The δ13C decline recorded in planktic foraminifera has previously been attributed to the release of respired carbon from the deep ocean that was subsequently transported within the upper ocean to sites where the signal was recorded (and then ultimately transferred to the atmosphere). Benthic δ13C records from the global upper ocean, including a new record presented here from the tropical Pacific, also document this distinct early deglacial δ13C decline. Here we present modeling evidence to show that rather than respired carbon from the deep ocean propagating directly to the upper ocean prior to reaching the atmosphere, the carbon would have first upwelled to the surface in the Southern Ocean where it would have entered the atmosphere. In this way the transmission of isotopically light carbon to the global upper ocean was analogous to the ongoing ocean invasion of fossil fuel CO2. The model results suggest that thermocline waters throughout the ocean and 500-2000m water depths were affected by this atmospheric bridge during the early deglaciation. |
format |
Article in Journal/Newspaper |
author |
Shao, Jun Stott, Lowell D. Menviel, Laurie Ridgwell, Andy Ödalen, Malin Mohtadi, Mayhar |
spellingShingle |
Shao, Jun Stott, Lowell D. Menviel, Laurie Ridgwell, Andy Ödalen, Malin Mohtadi, Mayhar The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
author_facet |
Shao, Jun Stott, Lowell D. Menviel, Laurie Ridgwell, Andy Ödalen, Malin Mohtadi, Mayhar |
author_sort |
Shao, Jun |
title |
The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
title_short |
The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
title_full |
The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
title_fullStr |
The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
title_full_unstemmed |
The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
title_sort |
atmospheric bridge communicated the δ13c decline during the last deglaciation to the global upper ocean |
publisher |
Copernicus Publications (EGU) |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/53659/ https://oceanrep.geomar.de/id/eprint/53659/1/cp-17-1507-2021.pdf https://oceanrep.geomar.de/id/eprint/53659/2/cp-17-1507-2021-supplement.pdf https://doi.org/10.5194/cp-17-1507-2021 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/53659/1/cp-17-1507-2021.pdf https://oceanrep.geomar.de/id/eprint/53659/2/cp-17-1507-2021-supplement.pdf Shao, J. , Stott, L. D., Menviel, L. , Ridgwell, A., Ödalen, M. and Mohtadi, M. (2021) The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean. Open Access Climate of the Past, 17 (4). pp. 1507-1521. DOI 10.5194/cp-17-1507-2021 <https://doi.org/10.5194/cp-17-1507-2021>. doi:10.5194/cp-17-1507-2021 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-17-1507-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
4 |
container_start_page |
1507 |
op_container_end_page |
1521 |
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1790608482925281280 |