Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean
In order to verify sediment trap samples as indicators of upper ocean 14C concentrations, particulate inorganic radiocarbon (PICA14C) collected by time-series sediment traps in the Sea of Okhotsk and the Bering Sea was measured by accelerator mass spectrometry (AMS). All of the PICA14C measurements...
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Radiocarbon
1996
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/1922 2023-05-15T15:43:47+02:00 Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean Honda, Makio C. 1996-01-01 application/pdf https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1922 eng eng Radiocarbon https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1922/1923 https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1922 Radiocarbon; Vol 38, No 3 (1996); 583-595 0033-8222 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1996 ftunivarizonaojs 2020-11-14T17:53:01Z In order to verify sediment trap samples as indicators of upper ocean 14C concentrations, particulate inorganic radiocarbon (PICA14C) collected by time-series sediment traps in the Sea of Okhotsk and the Bering Sea was measured by accelerator mass spectrometry (AMS). All of the PICA14C measurements were $lt;0%, in contrast to GEOSECS 14C data in the upper ocean from the northwestern North Pacific. This difference is attributed to the upwelling of deepwater that contains low A14C of dissolved inorganic carbon (DICAI4C) and to the decrease over time of surface DICAI4C owing to the decrease of atmospheric A14C values. In addition, PICAI4C values showed significant seasonal variability: PICAI4C collected in the fall was the greatest (-22%o on average), whereas PICA14C collected in winter showed an average minimum of -48%o. It is likely that this difference was caused by changes in mixed layer thickness. Although some uncertainties remain, further study on PICA14C will enable us to estimate seasonal variability in DICAI4C and air-sea CO2 exchange rate. Article in Journal/Newspaper Bering Sea Journals at the University of Arizona Bering Sea Okhotsk Pacific |
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Open Polar |
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Journals at the University of Arizona |
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ftunivarizonaojs |
language |
English |
description |
In order to verify sediment trap samples as indicators of upper ocean 14C concentrations, particulate inorganic radiocarbon (PICA14C) collected by time-series sediment traps in the Sea of Okhotsk and the Bering Sea was measured by accelerator mass spectrometry (AMS). All of the PICA14C measurements were $lt;0%, in contrast to GEOSECS 14C data in the upper ocean from the northwestern North Pacific. This difference is attributed to the upwelling of deepwater that contains low A14C of dissolved inorganic carbon (DICAI4C) and to the decrease over time of surface DICAI4C owing to the decrease of atmospheric A14C values. In addition, PICAI4C values showed significant seasonal variability: PICAI4C collected in the fall was the greatest (-22%o on average), whereas PICA14C collected in winter showed an average minimum of -48%o. It is likely that this difference was caused by changes in mixed layer thickness. Although some uncertainties remain, further study on PICA14C will enable us to estimate seasonal variability in DICAI4C and air-sea CO2 exchange rate. |
format |
Article in Journal/Newspaper |
author |
Honda, Makio C. |
spellingShingle |
Honda, Makio C. Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean |
author_facet |
Honda, Makio C. |
author_sort |
Honda, Makio C. |
title |
Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean |
title_short |
Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean |
title_full |
Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean |
title_fullStr |
Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean |
title_full_unstemmed |
Inorganic Radiocarbon in Time-Series Sediment Trap Samples: Implication of Seasonal Variation of 14C in the Upper Ocean |
title_sort |
inorganic radiocarbon in time-series sediment trap samples: implication of seasonal variation of 14c in the upper ocean |
publisher |
Radiocarbon |
publishDate |
1996 |
url |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1922 |
geographic |
Bering Sea Okhotsk Pacific |
geographic_facet |
Bering Sea Okhotsk Pacific |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
Radiocarbon; Vol 38, No 3 (1996); 583-595 0033-8222 |
op_relation |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1922/1923 https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1922 |
_version_ |
1766377979885125632 |