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

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

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410703a&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10703

Physics

12

Biogeosciences: Carbon Cycling (4806), Cryosphere: Ice Cores (4932), Global Change: Abrupt/Rapid Climate Change (4901, 8408), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Atmospheric Processes: Paleoclimatology (0473, 4900)

Scientific paper

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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