1. Geological Institute; ETH Zürich; Zürich Switzerland
2. Department of Earth, Atmospheric and Planetary Sciences; Massachusetts Institute of Technology; Cambridge MA USA
3. Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences; University of Cambridge; Cambridge UK
4. Now at Sediment & Isotope Geology; Ruhr-Universität Bochum; Bochum Germany
5. Bjerknes Center for Climate Research and Department of Earth Science; University of Bergen; Bergen Norway
6. Earth Science Department; Utrecht University; Utrecht Netherlands