Carbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciation

Giuseppe Siani (), Elisabeth Michel, Ricardo De Pol-Holz, Tim DeVries, Frank Lamy, Mélanie Carel, Gulay Isguder, Fabien Dewilde and Anna Lourantou
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Giuseppe Siani: Laboratoire des Interactions et Dynamique des Environnements de Surface (IDES), UMR 8148, CNRS-Université de Paris-Sud
Elisabeth Michel: Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Laboratoire mixte CNRS-CEA
Ricardo De Pol-Holz: Center for Climate and Resilence Research, University of Concepcion
Tim DeVries: University of California
Frank Lamy: Alfred Wegener Institut fur Polar und Meeresforschung
Mélanie Carel: Laboratoire des Interactions et Dynamique des Environnements de Surface (IDES), UMR 8148, CNRS-Université de Paris-Sud
Gulay Isguder: Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Laboratoire mixte CNRS-CEA
Fabien Dewilde: Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Laboratoire mixte CNRS-CEA
Anna Lourantou: Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Laboratoire mixte CNRS-CEA

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: Abstract The Southern Ocean plays a prominent role in the Earth’s climate and carbon cycle. Changes in the Southern Ocean circulation may have regulated the release of CO2 to the atmosphere from a deep-ocean reservoir during the last deglaciation. However, the path and exact timing of this deglacial CO2 release are still under debate. Here we present measurements of deglacial surface reservoir 14C age changes in the eastern Pacific sector of the Southern Ocean, obtained by 14C dating of tephra deposited over the marine and terrestrial regions. These results, along with records of foraminifera benthic–planktic 14C age and δ13C difference, provide evidence for three periods of enhanced upwelling in the Southern Ocean during the last deglaciation, supporting the hypothesis that Southern Ocean upwelling contributed to the deglacial rise in atmospheric CO2. These independently dated marine records suggest synchronous changes in the Southern Ocean circulation and Antarctic climate during the last deglaciation.

Date: 2013
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DOI: 10.1038/ncomms3758

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