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AMS 14C Study of Transient Events and of the Ventilation Rate of the Pacific Intermediate Water During the Last Deglaciation

Published online by Cambridge University Press:  18 July 2016

Jean-Claude Duplessy
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA F-91198 Gif-sur-Yvette Cedex, France
Maurice Arnold
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA F-91198 Gif-sur-Yvette Cedex, France
Edouard Bard
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA F-91198 Gif-sur-Yvette Cedex, France
Anne Juillet-Leclerc
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA F-91198 Gif-sur-Yvette Cedex, France
Nejib Kallel
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA F-91198 Gif-sur-Yvette Cedex, France
Laurent Labeyrie
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA F-91198 Gif-sur-Yvette Cedex, France
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Abstract

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14C analysis of monospecific samples of planktonic and benthic foraminifera were performed in deep-sea sediment cores from the Atlantic and Pacific Oceans by Accelerator Mass Spectrometry (AMS). These measurements demonstrate that the Younger Dryas cold event, first described in the north Atlantic, is also present at the same time in the north Pacific Ocean. The comparison of the 14C ages of planktonic and benthic foraminifera from the same sediment level in two Pacific cores shows that the ventilation time of the Pacific Ocean was greater than today during the last ice age, but significantly less than today during the deglaciation.

Type
II. Carbon Cycle in the Environment
Copyright
Copyright © The American Journal of Science 

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