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AGU: Geophysical Research Letters

 

Keywords

  • abrupt climate change
  • atmospheric CO2
  • carbon cycle

Index Terms

  • Biogeosciences: Carbon cycling
  • Cryosphere: Ice cores
  • Global Change: Abrupt/rapid climate change
  • Global Change: Biogeochemical cycles, processes, and modeling
  • Atmospheric Processes: Paleoclimatology

Abstract

Atmospheric CO2 and climate from 65 to 30 ka B.P.

Jinho Ahn

Department of Geosciences, Oregon State University, Corvallis, Oregon, USA

Edward J. Brook

Department of Geosciences, Oregon State University, Corvallis, Oregon, USA

Using new and existing ice core CO2 data from 65 ∼ 30 ka a new chronology for CO2 is established and synchronized with Greenland ice core records to study how high latitude climate change and the carbon cycle were linked during the last glacial period. Atmospheric CO2 rose several thousand years before abrupt warming in Greenland associated with Dansgaard-Oeschger events, 8, 12, 14, 17, four large warm events that follow Heinrich events. The CO2 rise terminated at the onset of Greenland warming for each of these events. Atmospheric CO2 is strongly correlated with the Antarctic isotopic temperature proxy with an average time lag of 720 ± 370 yr (mean ± 1σ) during the time interval studied. The new data and chronology should provide a better target for models attempting to explain CO2 variability and abrupt climate change.

Received 2 February 2007; accepted 20 April 2007; published 22 May 2007.

Citation: Ahn, J., and E. J. Brook (2007), Atmospheric CO2 and climate from 65 to 30 ka B.P., Geophys. Res. Lett., 34, L10703, doi:10.1029/2007GL029551.

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