WAIS Divide Ice Core Marine Isotope Stage 3 CO2 record

CO2 concentrations in trapped air from the WAIS Divide ice core for Marine Isotope Stage 3 (age range for data 23-67 ka). Methods described in Marcott et al. (2014, Nature, 515, 616-619) and Ahn et al. (2009, Journal of Glaciology, 55, 499-506).