Did the North Atlantic Ocean sequester more CO2 during the last glacial?

Jimin Yu, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, David J Thornalley, University College London, Dept. of Geography, London, United Kingdom, Zhangdong Jin, IEE Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, Eelco Johan Rohling, Utrecht University, Department of Earth Sciences, Utrecht, Netherlands, Laurie Menviel, University of New South Wales, Climate Change Research Centre, Sydney, NSW, Australia and I. Nicholas McCave, University of Cambridge, Cambridge, United Kingdom