Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both?
A new reconstruction of past atmospheric Δ14C (Δ14Catm) based on Polish lake varved sediments has suggested that previous Δ14Catm values (e.g. from the Cariaco basin record) for the beginning of the Younger Dryas cold event (YD) are overestimates and that the Δ14Catm rise at the YD onset could only...
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ftunivbern:oai:boris.unibe.ch:158539 2023-08-20T04:06:57+02:00 Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? Marchal, Olivier Stocker, Thomas F. Muscheler, Raimund 2001 application/pdf https://boris.unibe.ch/158539/1/marchal01epsl.pdf https://boris.unibe.ch/158539/ eng eng Elsevier https://boris.unibe.ch/158539/ info:eu-repo/semantics/restrictedAccess Marchal, Olivier; Stocker, Thomas F.; Muscheler, Raimund (2001). Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? Earth and planetary science letters, 185(3-4), pp. 383-395. Elsevier 10.1016/S0012-821X(00)00383-6 <http://dx.doi.org/10.1016/S0012-821X(00)00383-6> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2001 ftunivbern https://doi.org/10.1016/S0012-821X(00)00383-6 2023-07-31T22:08:11Z A new reconstruction of past atmospheric Δ14C (Δ14Catm) based on Polish lake varved sediments has suggested that previous Δ14Catm values (e.g. from the Cariaco basin record) for the beginning of the Younger Dryas cold event (YD) are overestimates and that the Δ14Catm rise at the YD onset could only be due to changes in atmospheric 14C production (PC-14). This result would have profound climatic implications, for the YD is a paradigm example of abrupt climate change which is usually thought to have been triggered by a reduction in the northward heat flux by the Atlantic thermohaline circulation. Here we examine results from a large number of simulations (300) based on a zonally averaged ocean circulation model, to constrain the effect on Δ14Catm of PC-14 changes during the YD as reconstructed from a Greenland ice core record of 10Be flux. Our results suggest that the scatter in the lake data set is too large to exclude the probable change in deep ocean ventilation at the onset of the YD. By contrast, the model fit to the higher Δ14Catm levels throughout the YD detected in the marine record is generally better when a substantial decrease in deep ocean ventilation is simulated. The early Δ14Catm drawdown that initiated during the first half of the YD, however, could entirely be due to production changes. If this was the case, the drawdown would not reflect an increasing formation of North Atlantic Intermediate Water or Southern Ocean water, as previously suggested. The rapid Δ14Catm rise at the YD onset documented in the marine record, however, remains unexplained. Article in Journal/Newspaper Greenland Greenland ice core ice core North Atlantic Southern Ocean BORIS (Bern Open Repository and Information System, University of Bern) Greenland Southern Ocean Earth and Planetary Science Letters 185 3-4 383 395 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Marchal, Olivier Stocker, Thomas F. Muscheler, Raimund Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? |
topic_facet |
530 Physics |
description |
A new reconstruction of past atmospheric Δ14C (Δ14Catm) based on Polish lake varved sediments has suggested that previous Δ14Catm values (e.g. from the Cariaco basin record) for the beginning of the Younger Dryas cold event (YD) are overestimates and that the Δ14Catm rise at the YD onset could only be due to changes in atmospheric 14C production (PC-14). This result would have profound climatic implications, for the YD is a paradigm example of abrupt climate change which is usually thought to have been triggered by a reduction in the northward heat flux by the Atlantic thermohaline circulation. Here we examine results from a large number of simulations (300) based on a zonally averaged ocean circulation model, to constrain the effect on Δ14Catm of PC-14 changes during the YD as reconstructed from a Greenland ice core record of 10Be flux. Our results suggest that the scatter in the lake data set is too large to exclude the probable change in deep ocean ventilation at the onset of the YD. By contrast, the model fit to the higher Δ14Catm levels throughout the YD detected in the marine record is generally better when a substantial decrease in deep ocean ventilation is simulated. The early Δ14Catm drawdown that initiated during the first half of the YD, however, could entirely be due to production changes. If this was the case, the drawdown would not reflect an increasing formation of North Atlantic Intermediate Water or Southern Ocean water, as previously suggested. The rapid Δ14Catm rise at the YD onset documented in the marine record, however, remains unexplained. |
format |
Article in Journal/Newspaper |
author |
Marchal, Olivier Stocker, Thomas F. Muscheler, Raimund |
author_facet |
Marchal, Olivier Stocker, Thomas F. Muscheler, Raimund |
author_sort |
Marchal, Olivier |
title |
Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? |
title_short |
Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? |
title_full |
Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? |
title_fullStr |
Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? |
title_full_unstemmed |
Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? |
title_sort |
atmospheric radiocarbon during the younger dryas: production, ventilation, or both? |
publisher |
Elsevier |
publishDate |
2001 |
url |
https://boris.unibe.ch/158539/1/marchal01epsl.pdf https://boris.unibe.ch/158539/ |
geographic |
Greenland Southern Ocean |
geographic_facet |
Greenland Southern Ocean |
genre |
Greenland Greenland ice core ice core North Atlantic Southern Ocean |
genre_facet |
Greenland Greenland ice core ice core North Atlantic Southern Ocean |
op_source |
Marchal, Olivier; Stocker, Thomas F.; Muscheler, Raimund (2001). Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both? Earth and planetary science letters, 185(3-4), pp. 383-395. Elsevier 10.1016/S0012-821X(00)00383-6 <http://dx.doi.org/10.1016/S0012-821X(00)00383-6> |
op_relation |
https://boris.unibe.ch/158539/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0012-821X(00)00383-6 |
container_title |
Earth and Planetary Science Letters |
container_volume |
185 |
container_issue |
3-4 |
container_start_page |
383 |
op_container_end_page |
395 |
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1774718333750345728 |