Abrupt change in atmospheric CO2 during the last ice age

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.