1. Geochemistry, Lamont Doherty Earth Observatory Palisades New York USA
2. Environmental Science, Barnard College New York New York USA
3. Department of Earth and Environmental Engineering and The Earth Institute/Columbia, Columbia University New York New York USA
4. Department of Atmospheric and Oceanic Sciences, McGill University Montréal Quebec Canada
5. Arctic Institute of North America and the Department of Anthropology and Archeology, Arctic Institute of North America University of Calgary Calgary Alberta Canada
6. Polar Research Board Washington, District of Columbia USA