Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters
Marine sediment records from the north Icelandic shelf, which rely on tephrochronological age models, reveal an average R (regional deviation from the modeled global surface ocean reservoir age) of approximately 150 yr for the last millennium. These tephra-based age models have not hitherto been ind...
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Radiocarbon
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/3222 2023-05-15T15:22:35+02:00 Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters Wanamaker Jr, Alan D Heinemeier, Jan Scourse, James D Richardson, Christopher A Butler, Paul G Eiriksson, Jon Knudsen, Karen Luise 2008-01-01 application/pdf https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3222 eng eng Radiocarbon https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3222/pdf https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3222 Radiocarbon; Vol 50, No 3 (2008); 399-412 0033-8222 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2008 ftunivarizonaojs 2020-11-14T17:53:01Z Marine sediment records from the north Icelandic shelf, which rely on tephrochronological age models, reveal an average R (regional deviation from the modeled global surface ocean reservoir age) of approximately 150 yr for the last millennium. These tephra-based age models have not hitherto been independently verified. Here, we provide data that corroborate R values derived from these sediment archives. We sampled the youngest portion (ontogenetic age) of a bivalve shell, Arctica islandica (L.), for radiocarbon analysis, which was collected alive in 2006 from the north Icelandic shelf in ~80 m water depth. Annual band counting from the sectioned shell revealed that this clam lived for more than 405 yr, making it the longest-lived mollusk and possibly the oldest non-colonial animal yet documented. The 14C age derived from the umbo region of the shell is 951 27 yr BP. Assuming that the bivalve settled onto the seabed at AD 1600, the corresponding local value of R is found to be 237 35 yr by comparison of the 14C age with the Marine04 calibration curve (Hughen et al. 2004) at this time. Furthermore, we cross-matched a 287-yr-old, dead-collected, A. islandica shell from AD 1601 to 1656 from the same site with the live-caught individual. 14C analysis from the ventral margin of this shell revealed a R of 186 50 yr at AD 1650. These values compare favorably with each other and with the tephra-based R values during this period, illustrating that 14C from A. islandica can effectively record 14C reservoir changes in the shelf seas. Article in Journal/Newspaper Arctica islandica Journals at the University of Arizona |
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Journals at the University of Arizona |
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ftunivarizonaojs |
language |
English |
description |
Marine sediment records from the north Icelandic shelf, which rely on tephrochronological age models, reveal an average R (regional deviation from the modeled global surface ocean reservoir age) of approximately 150 yr for the last millennium. These tephra-based age models have not hitherto been independently verified. Here, we provide data that corroborate R values derived from these sediment archives. We sampled the youngest portion (ontogenetic age) of a bivalve shell, Arctica islandica (L.), for radiocarbon analysis, which was collected alive in 2006 from the north Icelandic shelf in ~80 m water depth. Annual band counting from the sectioned shell revealed that this clam lived for more than 405 yr, making it the longest-lived mollusk and possibly the oldest non-colonial animal yet documented. The 14C age derived from the umbo region of the shell is 951 27 yr BP. Assuming that the bivalve settled onto the seabed at AD 1600, the corresponding local value of R is found to be 237 35 yr by comparison of the 14C age with the Marine04 calibration curve (Hughen et al. 2004) at this time. Furthermore, we cross-matched a 287-yr-old, dead-collected, A. islandica shell from AD 1601 to 1656 from the same site with the live-caught individual. 14C analysis from the ventral margin of this shell revealed a R of 186 50 yr at AD 1650. These values compare favorably with each other and with the tephra-based R values during this period, illustrating that 14C from A. islandica can effectively record 14C reservoir changes in the shelf seas. |
format |
Article in Journal/Newspaper |
author |
Wanamaker Jr, Alan D Heinemeier, Jan Scourse, James D Richardson, Christopher A Butler, Paul G Eiriksson, Jon Knudsen, Karen Luise |
spellingShingle |
Wanamaker Jr, Alan D Heinemeier, Jan Scourse, James D Richardson, Christopher A Butler, Paul G Eiriksson, Jon Knudsen, Karen Luise Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters |
author_facet |
Wanamaker Jr, Alan D Heinemeier, Jan Scourse, James D Richardson, Christopher A Butler, Paul G Eiriksson, Jon Knudsen, Karen Luise |
author_sort |
Wanamaker Jr, Alan D |
title |
Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters |
title_short |
Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters |
title_full |
Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters |
title_fullStr |
Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters |
title_full_unstemmed |
Very Long-Lived Mollusks Confirm 17th Century AD Tephra-Based Radiocarbon Reservoir Ages for North Icelandic Shelf Waters |
title_sort |
very long-lived mollusks confirm 17th century ad tephra-based radiocarbon reservoir ages for north icelandic shelf waters |
publisher |
Radiocarbon |
publishDate |
2008 |
url |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3222 |
genre |
Arctica islandica |
genre_facet |
Arctica islandica |
op_source |
Radiocarbon; Vol 50, No 3 (2008); 399-412 0033-8222 |
op_relation |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3222/pdf https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3222 |
_version_ |
1766353225920806912 |