Journal
GLOBAL BIOGEOCHEMICAL CYCLES
Volume 24, Issue -, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2009GB003545
Keywords
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Funding
- European Commission
- European Research Training and Mobility Network GREENCYCLES
- QUEST-INSU
- STREP EPICA-MIS [FP6]
- French ANR PICC [ANR-05-BLAN-0312-01]
- Fondation de France
- Balzan Price
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The causes of the similar to 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 (delta(CO2)-C-13) 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 delta(CO2)-C-13 record is characterized by a W shape, with two negative delta(CO2)-C-13 excursions of 0.5 parts per thousand during Heinrich 1 and Younger Dryas events, bracketing a positive delta(CO2)-C-13 peak during the Bolling/Allerod 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 delta(CO2)-C-13 decline and from rapid vegetation buildup during the CO2 plateau of the Bolling/Allerod.
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