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| Titel |
Synchronous abrupt and transient fluctuations of carbon dioxide and radiocarbon at the onset of the Younger Dryas |
| VerfasserIn |
Margret Steinthorsdottir, Agatha M. de Boer, Kevin I. C. Oliver, Francesco Muschitiello, Maarten Blaauw, Barbara Wohlfarth |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109135
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| Publikation (Nr.) |
 EGU/EGU2015-9015.pdf |
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| Zusammenfassung |
| Just before the onset of the Younger Dryas (YD) cold event, several stomatal proxy-based records of atmospheric CO2 concentration (pCO2) show a sharp increase of 50-100 ppm, followed by a rapid decrease of similar magnitude. We suggest that this fluctuation occurred due to a major ocean flushing event. Simulations with the GENIE earth system model indicate that changes in ocean ventilation, perhaps related to the hypothesis of the glacial ocean as a thermobaric capacitor, can produce such large multi-decadal timescale fluctuations in pCO2. Our argument is supported by the IntCal13 radiocarbon (∆14C ) record, which documents decreasing ∆14C right before the YD onset when pCO2 peaks, consistent with a source of “old” CO2 from the deep ocean. We further suggest that rapid transient decadal to centennial scale fluctuations in pCO2 may have remained undetected so far in ice cores. Future terrestrial pCO2 records could potentially show that similar large transient fluctuations of pCO2 have occurred at other times in the past. |
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