1. Norwegian Polar Institute, Fram Centre NO-9296 Tromsø Norway
2. Department of Mathematics and Statistics, Faculty of Science and Technology, University of Tromsø NO-9037 Tromsø Norway
3. Institute of Geology, Tallinn University of Technology, Ehitajate tee 5 EE-19086 Tallinn Estonia
4. Centre for Isotope Research, University of Groningen, Nijenborgh 4 NL-9747 AG Groningen The Netherlands
5. Arctic Centre, University of Lapland, Pohjoisranta 4 FI-96101 Rovaniemi Finland
6. Department of Earth Sciences, Uppsala University
Villavägen 16
SE-752 36 Uppsala Sweden
7. Institute for Marine and Atmospheric research Utrecht, Utrecht University
Princetonplein 5
NL-3584 CC Utrecht The Netherlands