1. Institute for Atmospheric and Climate Science; ETH Zürich Switzerland
2. Oeschger Centre for Climate Change Research, Institute of Geography; University of Bern; Switzerland
3. Geophysical Institute; University of Bergen and Bjerknes Centre for Climate Research; Norway
4. School of Earth Sciences; University of Melbourne; Victoria Australia
5. P. P. Shirshov Institute of Oceanology; Russian Academy of Sciences; Moscow Russia