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Bauska TK, Baggenstos D, Brook EJ, et al. Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation. Proc Natl Acad Sci U S A. 2016;113(13):3465-70doi: 10.1073/pnas.1513868113.
Bauska, T. K., Baggenstos, D., Brook, E. J., Mix, A. C., Marcott, S. A., Petrenko, V. V., Schaefer, H., Severinghaus, J. P., & Lee, J. E. (2016). Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation. Proceedings of the National Academy of Sciences of the United States of America, 113(13), 3465-70. https://doi.org/10.1073/pnas.1513868113
Bauska, Thomas K, et al. "Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation." Proceedings of the National Academy of Sciences of the United States of America vol. 113,13 (2016): 3465-70. doi: https://doi.org/10.1073/pnas.1513868113
Bauska TK, Baggenstos D, Brook EJ, Mix AC, Marcott SA, Petrenko VV, Schaefer H, Severinghaus JP, Lee JE. Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation. Proc Natl Acad Sci U S A. 2016 Mar 29;113(13):3465-70. doi: 10.1073/pnas.1513868113. Epub 2016 Mar 14. PMID: 26976561; PMCID: PMC4822573.
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Proc Natl Acad Sci U S A. 2016 Mar 29;113(13):3465-70. doi: 10.1073/pnas.1513868113. Epub 2016 Mar 14.

Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation.

Proceedings of the National Academy of Sciences of the United States of America

Thomas K Bauska, Daniel Baggenstos, Edward J Brook, Alan C Mix, Shaun A Marcott, Vasilii V Petrenko, Hinrich Schaefer, Jeffrey P Severinghaus, James E Lee

Affiliations

  1. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331; Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom; [email protected].
  2. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093;
  3. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331;
  4. Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706;
  5. Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627;
  6. Climate and Atmosphere Center, National Institute of Water and Atmospheric Research Ltd, Wellington, New Zealand 6023.

PMID: 26976561 PMCID: PMC4822573 DOI: 10.1073/pnas.1513868113

Abstract

An understanding of the mechanisms that control CO2 change during glacial-interglacial cycles remains elusive. Here we help to constrain changing sources with a high-precision, high-resolution deglacial record of the stable isotopic composition of carbon in CO2(δ(13)C-CO2) in air extracted from ice samples from Taylor Glacier, Antarctica. During the initial rise in atmospheric CO2 from 17.6 to 15.5 ka, these data demarcate a decrease in δ(13)C-CO2, likely due to a weakened oceanic biological pump. From 15.5 to 11.5 ka, the continued atmospheric CO2 rise of 40 ppm is associated with small changes in δ(13)C-CO2, consistent with a nearly equal contribution from a further weakening of the biological pump and rising ocean temperature. These two trends, related to marine sources, are punctuated at 16.3 and 12.9 ka with abrupt, century-scale perturbations in δ(13)C-CO2 that suggest rapid oxidation of organic land carbon or enhanced air-sea gas exchange in the Southern Ocean. Additional century-scale increases in atmospheric CO2 coincident with increases in atmospheric CH4 and Northern Hemisphere temperature at the onset of the Bølling (14.6-14.3 ka) and Holocene (11.6-11.4 ka) intervals are associated with small changes in δ(13)C-CO2, suggesting a combination of sources that included rising surface ocean temperature.

Keywords: atmospheric CO2; carbon cycle; ice cores; last deglaciation; paleoclimate

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