North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations
Records of changing atmospheric radiocarbon concentration (Delta(14)C(atm)) from the last deglaciation suggest that an anomaly during the Younger Dryas (YD) cold phase is the largest of the last 15,000 y. However, the relative influences of the variable (14)C production rate and changes in the flux...
Published in: | Global and Planetary Change |
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Main Authors: | , , , , , , |
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Language: | English |
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2011
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/north-atlantic-reservoir-ages-linked-to-high-younger-dryas-atmospheric-radiocarbon-concentrations(27777901-8107-4463-be58-6b6b186a5bd2).html https://doi.org/10.1016/j.gloplacha.2011.06.011 |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/27777901-8107-4463-be58-6b6b186a5bd2 2023-05-15T16:39:27+02:00 North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations Austin, William E. N. Telford, Richard J. Ninnemann, Ulysses S. Brown, Louise Wilson, Lindsay J. Small, David P. Bryant, Charlotte L. 2011-12 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/north-atlantic-reservoir-ages-linked-to-high-younger-dryas-atmospheric-radiocarbon-concentrations(27777901-8107-4463-be58-6b6b186a5bd2).html https://doi.org/10.1016/j.gloplacha.2011.06.011 eng eng info:eu-repo/semantics/restrictedAccess Austin , W E N , Telford , R J , Ninnemann , U S , Brown , L , Wilson , L J , Small , D P & Bryant , C L 2011 , ' North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations ' , Global and Planetary Change , vol. 79 , no. 3-4 , pp. 226-233 . https://doi.org/10.1016/j.gloplacha.2011.06.011 ICE-CORE LAST GLACIAL TERMINATION MARINE SAMPLES CALIBRATION CURVE Radiocarbon Tephra GLOBAL CARBON-CYCLE PAST 50,000 YEARS NORWEGIAN SEA OCEAN CIRCULATION YR BP North Atlantic Younger Dryas C-14 AGES article 2011 ftunstandrewcris https://doi.org/10.1016/j.gloplacha.2011.06.011 2022-06-02T07:41:52Z Records of changing atmospheric radiocarbon concentration (Delta(14)C(atm)) from the last deglaciation suggest that an anomaly during the Younger Dryas (YD) cold phase is the largest of the last 15,000 y. However, the relative influences of the variable (14)C production rate and changes in the flux and storage of the carbon cycle on Delta(14)C(atm) during the YD is uncertain. The latter is strongly influenced by carbon exchange between the atmosphere and other reservoirs, such as the deep ocean. In particular, reorganisation of the North Atlantic's overturning circulation, widely associated with intervals of abrupt climate change such as the YD, may have a significant effect on ocean-atmosphere carbon exchange. Here we reconstruct apparent surface water (14)C ages (reservoir ages (R(t)) in the Atlantic Ocean north of 50 degrees N through the YD interval. Within less than 500 calendar years of the start of the YD cold phase, R(t) increased dramatically, reaching values of up to 1000 y. After 12,300 y BP, R(t) gradually decreased, approaching modern North Atlantic surface ocean values of 400 y by the end of the YD. The method employed here to reconstruct North Atlantic surface ocean R(t) depends on a number of assumptions, most significant of which is the synchronicity of the events in the NGRIP ice chronology and the St Kilda isotope record which were used for correlation. Despite these uncertainties, the calculations of R(t) in this study are in good agreement with previously reported marine-terrestrial (14)C data linked by the widespread YD Vedde Ash isochrone. The (14)C concentration of the surface North Atlantic changed in opposition to Delta(14)C(atm), throughout the YD, suggesting that extensive sea-ice cover limited air-sea exchange and that a direct link exists between the strength of Atlantic overturning circulation and the (14)C ventilation rate of the deep ocean on sub-centennial timescales. (C) 2011 Elsevier B.V. All rights reserved. Article in Journal/Newspaper ice core NGRIP North Atlantic Norwegian Sea Sea ice University of St Andrews: Research Portal Norwegian Sea Global and Planetary Change 79 3-4 226 233 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ICE-CORE LAST GLACIAL TERMINATION MARINE SAMPLES CALIBRATION CURVE Radiocarbon Tephra GLOBAL CARBON-CYCLE PAST 50,000 YEARS NORWEGIAN SEA OCEAN CIRCULATION YR BP North Atlantic Younger Dryas C-14 AGES |
spellingShingle |
ICE-CORE LAST GLACIAL TERMINATION MARINE SAMPLES CALIBRATION CURVE Radiocarbon Tephra GLOBAL CARBON-CYCLE PAST 50,000 YEARS NORWEGIAN SEA OCEAN CIRCULATION YR BP North Atlantic Younger Dryas C-14 AGES Austin, William E. N. Telford, Richard J. Ninnemann, Ulysses S. Brown, Louise Wilson, Lindsay J. Small, David P. Bryant, Charlotte L. North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations |
topic_facet |
ICE-CORE LAST GLACIAL TERMINATION MARINE SAMPLES CALIBRATION CURVE Radiocarbon Tephra GLOBAL CARBON-CYCLE PAST 50,000 YEARS NORWEGIAN SEA OCEAN CIRCULATION YR BP North Atlantic Younger Dryas C-14 AGES |
description |
Records of changing atmospheric radiocarbon concentration (Delta(14)C(atm)) from the last deglaciation suggest that an anomaly during the Younger Dryas (YD) cold phase is the largest of the last 15,000 y. However, the relative influences of the variable (14)C production rate and changes in the flux and storage of the carbon cycle on Delta(14)C(atm) during the YD is uncertain. The latter is strongly influenced by carbon exchange between the atmosphere and other reservoirs, such as the deep ocean. In particular, reorganisation of the North Atlantic's overturning circulation, widely associated with intervals of abrupt climate change such as the YD, may have a significant effect on ocean-atmosphere carbon exchange. Here we reconstruct apparent surface water (14)C ages (reservoir ages (R(t)) in the Atlantic Ocean north of 50 degrees N through the YD interval. Within less than 500 calendar years of the start of the YD cold phase, R(t) increased dramatically, reaching values of up to 1000 y. After 12,300 y BP, R(t) gradually decreased, approaching modern North Atlantic surface ocean values of 400 y by the end of the YD. The method employed here to reconstruct North Atlantic surface ocean R(t) depends on a number of assumptions, most significant of which is the synchronicity of the events in the NGRIP ice chronology and the St Kilda isotope record which were used for correlation. Despite these uncertainties, the calculations of R(t) in this study are in good agreement with previously reported marine-terrestrial (14)C data linked by the widespread YD Vedde Ash isochrone. The (14)C concentration of the surface North Atlantic changed in opposition to Delta(14)C(atm), throughout the YD, suggesting that extensive sea-ice cover limited air-sea exchange and that a direct link exists between the strength of Atlantic overturning circulation and the (14)C ventilation rate of the deep ocean on sub-centennial timescales. (C) 2011 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Austin, William E. N. Telford, Richard J. Ninnemann, Ulysses S. Brown, Louise Wilson, Lindsay J. Small, David P. Bryant, Charlotte L. |
author_facet |
Austin, William E. N. Telford, Richard J. Ninnemann, Ulysses S. Brown, Louise Wilson, Lindsay J. Small, David P. Bryant, Charlotte L. |
author_sort |
Austin, William E. N. |
title |
North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations |
title_short |
North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations |
title_full |
North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations |
title_fullStr |
North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations |
title_full_unstemmed |
North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations |
title_sort |
north atlantic reservoir ages linked to high younger dryas atmospheric radiocarbon concentrations |
publishDate |
2011 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/north-atlantic-reservoir-ages-linked-to-high-younger-dryas-atmospheric-radiocarbon-concentrations(27777901-8107-4463-be58-6b6b186a5bd2).html https://doi.org/10.1016/j.gloplacha.2011.06.011 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
ice core NGRIP North Atlantic Norwegian Sea Sea ice |
genre_facet |
ice core NGRIP North Atlantic Norwegian Sea Sea ice |
op_source |
Austin , W E N , Telford , R J , Ninnemann , U S , Brown , L , Wilson , L J , Small , D P & Bryant , C L 2011 , ' North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations ' , Global and Planetary Change , vol. 79 , no. 3-4 , pp. 226-233 . https://doi.org/10.1016/j.gloplacha.2011.06.011 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2011.06.011 |
container_title |
Global and Planetary Change |
container_volume |
79 |
container_issue |
3-4 |
container_start_page |
226 |
op_container_end_page |
233 |
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1766029799892975616 |