Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP
ABSTRACT. We present two new high-resolution sediment records from the southwestern Iceland and Norwegian Seas that were dated by numerous 14C ages up to 5414C ka BP. Based on various lines of evidence, the local 14C reservoir effect was restricted to 400-1600 yr. The planktic stable isotope records...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.459.3368 2023-05-15T16:39:15+02:00 Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP Antje H. L. Voelker Michael Sarnthein Pieter M. Grootes Markus Schleicher The Pennsylvania State University CiteSeerX Archives 1998 http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3368 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3368 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://journals.uair.arizona.edu/index.php/radiocarbon/article/download/2038/2041/ text 1998 ftciteseerx 2016-01-08T06:24:39Z ABSTRACT. We present two new high-resolution sediment records from the southwestern Iceland and Norwegian Seas that were dated by numerous 14C ages up to 5414C ka BP. Based on various lines of evidence, the local 14C reservoir effect was restricted to 400-1600 yr. The planktic stable isotope records reveal several meltwater spikes that were sampled with an aver-age time resolution of 50 yr in PS2644 and 130 yr in core 23071 during isotope stage 3. Most of the 6180 spikes correlate peak-by-peak to the stadials and cold rebounds of the Dansgaard-Oeschger cycles in the annual-layer counted GISP2 ice core, with the major spikes reflecting the Heinrich events 1-6. This correlation indicates large fluctuations in the calibration of 14C ages between 20 and 54 i4C ka BP. Generally the results confirm the 14C age shifts as predicted by the geomagnetic model of Laj, Mazaud and Duplessy (1996). However, the amplitude and speed of the abrupt decrease and subsequent major increase of our 14C shifts after 4514C ka BP clearly exceed the geomagnetic prediction near 40-43 and 32-34 calendar (cal) ka BP. At these times, the geomagnetic field intensity minima linked to the Laschamp and the Mono Lake excursions and confirmed by a local geomagnetic record, probably led to a sudden increase in cosmogenic 14C and 10Be production, giving rise to excess 14C in the atmosphere of up to 1200%o. Text ice core Iceland Nordic Seas Unknown |
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ftciteseerx |
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English |
description |
ABSTRACT. We present two new high-resolution sediment records from the southwestern Iceland and Norwegian Seas that were dated by numerous 14C ages up to 5414C ka BP. Based on various lines of evidence, the local 14C reservoir effect was restricted to 400-1600 yr. The planktic stable isotope records reveal several meltwater spikes that were sampled with an aver-age time resolution of 50 yr in PS2644 and 130 yr in core 23071 during isotope stage 3. Most of the 6180 spikes correlate peak-by-peak to the stadials and cold rebounds of the Dansgaard-Oeschger cycles in the annual-layer counted GISP2 ice core, with the major spikes reflecting the Heinrich events 1-6. This correlation indicates large fluctuations in the calibration of 14C ages between 20 and 54 i4C ka BP. Generally the results confirm the 14C age shifts as predicted by the geomagnetic model of Laj, Mazaud and Duplessy (1996). However, the amplitude and speed of the abrupt decrease and subsequent major increase of our 14C shifts after 4514C ka BP clearly exceed the geomagnetic prediction near 40-43 and 32-34 calendar (cal) ka BP. At these times, the geomagnetic field intensity minima linked to the Laschamp and the Mono Lake excursions and confirmed by a local geomagnetic record, probably led to a sudden increase in cosmogenic 14C and 10Be production, giving rise to excess 14C in the atmosphere of up to 1200%o. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Antje H. L. Voelker Michael Sarnthein Pieter M. Grootes Markus Schleicher |
spellingShingle |
Antje H. L. Voelker Michael Sarnthein Pieter M. Grootes Markus Schleicher Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP |
author_facet |
Antje H. L. Voelker Michael Sarnthein Pieter M. Grootes Markus Schleicher |
author_sort |
Antje H. L. Voelker |
title |
Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP |
title_short |
Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP |
title_full |
Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP |
title_fullStr |
Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP |
title_full_unstemmed |
Correlation of marine 14C ages from the Nordic Seas with the GISP2 isotope record: Implications for 14C calibration beyond 25 ka BP |
title_sort |
correlation of marine 14c ages from the nordic seas with the gisp2 isotope record: implications for 14c calibration beyond 25 ka bp |
publishDate |
1998 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3368 |
genre |
ice core Iceland Nordic Seas |
genre_facet |
ice core Iceland Nordic Seas |
op_source |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/download/2038/2041/ |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3368 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766029584482959360 |