After a brief introduction into the marine carbon cycle, the calcite compensation theory and the rain-ratio hypothesis, two theories that may explain glacial to interglacial changes in atmospheric CO2 concentrations are presented. The validity of these theories in the Southern Ocean is tested with B/Ca-reconstructed carbonate ion concentrations of deep and intermediate waters. Deglacial [CO3 2−] excursions reveal a close relationship between changes in the oceanic inorganic carbon system and atmospheric CO2, which follow the predictions of the calcite compensation theory on glacial-interglacial timescales. Short-termed [CO3 2−] variations are likely due to the influence of the biological pump and/or changes in circulation patterns.
KeywordsDissolve Inorganic Carbon Last Glacial Maximum Total Alkalinity Dust Concentration Annual Layer
This work was supported by funding from MARUM. The North-GRIP project was directed and organized by the Department of Geophysics at the Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen. It was supported by funding agencies in Denmark(SNF), Belgium (NFSR), France (IFRTP and INSU/CNRS), Germany (AWI), Iceland (RannIs), Japan (MECS), Sweden (SPRS), Switzerland (SNF) and the United States of America (NSF). We wish to thank all the funding bodies and field participants.
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