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

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Abstract
  • 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.
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Citation
  • Ahn, J., and E. J. Brook (2007), Atmospheric CO₂ and climate from 65 to 30 ka B.P., Geophysical Research Letters, 34, L10703, doi:10.1029/2007GL029551.
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Journal Volume
  • 34
Journal Issue/Number
  • 10
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Déclaration de droits
Funding Statement (additional comments about funding)
  • Financial support was provided by the Gary Comer Science and Education Foundation, and National Science Foundation Grant OPP 0337891 to EJB.
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