14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years
A series of 14 C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000...
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American Association for the Advancement of Science (AAAS)
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Online Access: | http://dx.doi.org/10.1126/science.1090300 https://www.science.org/doi/pdf/10.1126/science.1090300 |
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craaas:10.1126/science.1090300 2024-06-23T07:53:20+00:00 14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years Hughen, K. Lehman, S. Southon, J. Overpeck, J. Marchal, O. Herring, C. Turnbull, J. 2004 http://dx.doi.org/10.1126/science.1090300 https://www.science.org/doi/pdf/10.1126/science.1090300 en eng American Association for the Advancement of Science (AAAS) Science volume 303, issue 5655, page 202-207 ISSN 0036-8075 1095-9203 journal-article 2004 craaas https://doi.org/10.1126/science.1090300 2024-06-06T04:01:15Z A series of 14 C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14 C activities varied substantially during the last glacial period, including sharp peaks synchronous with the Laschamp and Mono Lake geomagnetic field intensity minimal and cosmogenic nuclide peaks in ice cores and marine sediments. Simulations with a geochemical box model suggest that much of the variability can be explained by geomagnetically modulated changes in 14 C production rate together with plausible changes in deep-ocean ventilation and the global carbon cycle during glaciation. Article in Journal/Newspaper Greenland Greenland Ice Sheet Project ice core Ice Sheet AAAS Resource Center (American Association for the Advancement of Science) Greenland Science 303 5655 202 207 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
op_collection_id |
craaas |
language |
English |
description |
A series of 14 C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14 C activities varied substantially during the last glacial period, including sharp peaks synchronous with the Laschamp and Mono Lake geomagnetic field intensity minimal and cosmogenic nuclide peaks in ice cores and marine sediments. Simulations with a geochemical box model suggest that much of the variability can be explained by geomagnetically modulated changes in 14 C production rate together with plausible changes in deep-ocean ventilation and the global carbon cycle during glaciation. |
format |
Article in Journal/Newspaper |
author |
Hughen, K. Lehman, S. Southon, J. Overpeck, J. Marchal, O. Herring, C. Turnbull, J. |
spellingShingle |
Hughen, K. Lehman, S. Southon, J. Overpeck, J. Marchal, O. Herring, C. Turnbull, J. 14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years |
author_facet |
Hughen, K. Lehman, S. Southon, J. Overpeck, J. Marchal, O. Herring, C. Turnbull, J. |
author_sort |
Hughen, K. |
title |
14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years |
title_short |
14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years |
title_full |
14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years |
title_fullStr |
14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years |
title_full_unstemmed |
14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years |
title_sort |
14 c activity and global carbon cycle changes over the past 50,000 years |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1126/science.1090300 https://www.science.org/doi/pdf/10.1126/science.1090300 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland Ice Sheet Project ice core Ice Sheet |
genre_facet |
Greenland Greenland Ice Sheet Project ice core Ice Sheet |
op_source |
Science volume 303, issue 5655, page 202-207 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1090300 |
container_title |
Science |
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303 |
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5655 |
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202 |
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207 |
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1802644931607527424 |