Paper in Press
GEOPHYSICAL RESEARCH LETTERS, doi:10.1029/2012GL053018
Abrupt change in atmospheric CO2 during the last ice age
- Half of CO2 increase during a 1500-year cold period occurred in < 200 yrs.
- Abrupt CO2 rise is synchronous, or slightly later than,a rapid Antarctic warming.
- C-cycle-climate modeling doesn't capture all of the processes for CO2 variations.
During the last glacial period atmospheric carbon dioxide and temperature in Antarctica varied in a similar fashion on millennial time scales, but previous work indicates that these changes were gradual. In a detailed analysis of one event we now find that approximately half of the CO2 increase that occurred during the 1500-year cold period between Dansgaard-Oeschger (DO) events 8 and 9 happened rapidly, over less than two centuries. This rise in CO2 was synchronous with, or slightly later than, a rapid increase of Antarctic temperature inferred from stable isotopes.
Received 6 July 2012; accepted 23 August 2012.
Citation: (2012), Abrupt change in atmospheric CO2 during the last ice age, Geophys. Res. Lett., doi:10.1029/2012GL053018, in press.