1. Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, Alaska, USA
2. Departamento de Geografía, Universidad Complutense de Madrid, Madrid, Spain
3. Department of Geosciences, University of Massachusetts, Amherst, Massachusetts, USA
4. Faculty of Education and Human Studies, Akita University, Akita, Japan
5. International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, Alaska, USA
6. Total S.A., Paris, France