1. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Potsdam Germany
2. Institute of GeosciencesUniversity of Potsdam Potsdam Germany
3. Department of GeosciencesUniversity of Oslo Oslo Norway
4. Institute of Petroleum Geology and GeophysicsRussian Academy of Sciences Novosibirsk Russia
5. Department of GeophysicsNovosibirsk State University Novosibirsk Russia
6. Melnikov Permafrost InstituteSiberian Branch, Russian Academy of Sciences Yakutsk Russia