Prof. Dr. Peter Lemke Alfred-Wegener-Institute, for Polar and Marine Research Postfach 120161, 27515 Bremerhaven, GERMANY e-mail: Peter.Lemke (at) awi.de Phone: +49 (0)471 - 4831 - 1751/1750 http://www.awi.de Peter, professor of physics of atmosphere and ocean at the University of Bremen and head of the Climate Sciences Research Division at the Alfred Wegener Institute of Polar and Marine Research, received his PhD in meteorology from the University of Hamburg in 1980. He has 30 years of experience of working in climate, sea ice and atmospheric research. He has participated in seven polar expeditions with the German research icebreaker “Polarstern”. On five expeditions he acted as chief scientist. His special interests are observation and modelling of high-latitude processes, especially the interaction between atmosphere, sea ice and ocean. He served on many national and international committees. Until 1999 he was a member of the Scientific Steering Group of the Arctic Climate System Study (ACSYS) of the World Climate Research Program (WCRP) and the chairman of the ACSYS Numerical Experimentation Group which co-ordinated international atmosphere-sea ice-ocean modelling activities. From 1995 to 2006 he was a member of the Joint Scientific Committee for the World Climate Research Programme and served as its chair from 2000 to 2006. In 1991 he received the German Polar Meteorology Award (Georgi-Preis) and since 2005 he is an Honourable Professor of the China Meteorological Administration, Beijing. He was the Coordinating Lead Author for Chapter 4 (Observations: Changes in Snow, Ice and Frozen Ground) of the IPCC Fourth Assessment Report published in 2007.