ESS11
Prof.
Jin-Yi Yu
Ice Sheet And CO2
qThe longest orbital-scale record of CO2 changes
comes from the Vostok ice core drilling site.
qThe CO2 record shows a series of regular
oscillation between CO2 values as high as 280-300 ppm and as low as 180-190 ppm over the last
400,000 years.
qThe dominant period of CO2 variations is
about 100,000 years.
(from Earth’s Climate: Past and Future)