Constraint of the CO2 rise by new atmospheric carbon isotopic measurements 
during the last deglaciation

Lourantou, Anna; Lavrič, Jost V.; Köhler, Peter; Barnola, Jean-Marc; Paillard, Didier; Michel, Elisabeth; Raynaud, Dominique; Chappellaz, Jérôme

doi:10.1029/2009gb003545

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Constraint of the CO₂ rise by new atmospheric carbon isotopic measurements during the last deglaciation

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Lavrič, Jost V.
Tall Tower Atmospheric Gas Measurements, Dr. J. Lavrič, Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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http://dx.doi.org/10.1029/2009GB003545
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Citation

Lourantou, A., Lavrič, J. V., Köhler, P., Barnola, J.-M., Paillard, D., Michel, E., et al. (2010). Constraint of the CO₂ rise by new atmospheric carbon isotopic measurements during the last deglaciation. Global Biogeochemical Cycles, 24(2), GB2015. doi:10.1029/2009gb003545.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-DA27-7

Abstract

The causes of the ∼80 ppmv increase of atmospheric carbon dioxide (CO₂) during the last glacial-interglacial climatic transition remain debated. We analyzed the parallel evolution of CO₂ and its stable carbon isotopic ratio (δ¹³CO₂) in the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core to bring additional constraints. Agreeing well but largely improving the Taylor Dome ice core record of lower resolution, our δ¹³CO₂ record is characterized by a W shape, with two negative δ¹³CO₂ excursions of 0.5‰ during Heinrich 1 and Younger Dryas events, bracketing a positive δ¹³CO₂ peak during the Bølling/Allerød warm period. The comparison with marine records and the outputs of two C cycle box models suggest that changes in Southern Ocean ventilation drove most of the CO₂ increase, with additional contributions from marine productivity changes on the initial CO₂ rise and δ¹³CO₂ decline and from rapid vegetation buildup during the CO₂ plateau of the Bølling/Allerød.