Start Date/Time: Thursday, October 17, 2013, 3:30 PM
Ending Date/Time: Thursday, October 17, 2013, 4:30 AM
Location: Johnson (JHN) 102
Improvements in the dating of Antarctic and Greenland ice cores are increasingly tightening constraints on the structure and relative timing of past millennial-scale climate and CO2 variations. Recent work points to near-synchrony between the onsets of abrupt climate transitions in Greenland and the onsets of opposing climate trends in Antarctica [Pedro et al., 2011]. Latest results also indicate essentially zero phase-lag between Antarctic temperature and atmospheric CO2 [Pedro et al., 2012; Parrenin et al., 2012]. This presentation will review the ice core results and use them in conjunction with a transient GCM simulation of the last deglaciation (Community Climate System Model version 3; He et al, ) to test hypotheses on the mechanisms of north-south climate coupling and CO2 ventilation from the deep Southern Ocean.