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...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:9162bfc6b79b4cb3b486ef7e5dcfda9b 2023-05-15T18:25:38+02:00 The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Mohtadi 2021-07-01 https://doi.org/10.5194/cp-17-1507-2021 https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf https://doaj.org/article/9162bfc6b79b4cb3b486ef7e5dcfda9b en eng Copernicus Publications doi:10.5194/cp-17-1507-2021 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf https://doaj.org/article/9162bfc6b79b4cb3b486ef7e5dcfda9b undefined Climate of the Past, Vol 17, Pp 1507-1521 (2021) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/cp-17-1507-2021 2023-01-22T19:30:40Z 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 500–2000 m water depths were affected by this atmospheric bridge during the early deglaciation. Article in Journal/Newspaper Southern Ocean Unknown Pacific Southern Ocean Climate of the Past 17 4 1507 1521 |
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geo envir J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Mohtadi The atmospheric bridge communicated the δ13C decline during the last deglaciation to the global upper ocean |
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geo envir |
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 500–2000 m water depths were affected by this atmospheric bridge during the early deglaciation. |
format |
Article in Journal/Newspaper |
author |
J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Mohtadi |
author_facet |
J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Mohtadi |
author_sort |
J. Shao |
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 |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1507-2021 https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf https://doaj.org/article/9162bfc6b79b4cb3b486ef7e5dcfda9b |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Climate of the Past, Vol 17, Pp 1507-1521 (2021) |
op_relation |
doi:10.5194/cp-17-1507-2021 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf https://doaj.org/article/9162bfc6b79b4cb3b486ef7e5dcfda9b |
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undefined |
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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