Ulysses Ninnemann, University of Bergen, Department of Earth Science and the Bjerknes Centre for Climate Research, Bergen, Norway, Eirik Vinje Galaasen, Nil Irvali, Uni Bjerknes Centre, Uni Research, Bergen, Norway, Yair Rosenthal, Rutgers University, Marine & Coastal Sciences, New Brunswick, NJ, United States, Helga Flesche Kleiven, University of Bergen, Bergen, Norway and David A Hodell, University of Cambridge, Godwin Laboratory for Palaeoclimate Research, Cambridge, United Kingdom