1. Department of Geosciences and Earth and Environmental Systems Institute; Pennsylvania State University; University Park; Pennsylvania; USA
2. Department of Physics and Astronomy; Bowdoin College; Brunswick; Maine; USA
3. Hydrologic Sciences Division; Desert Research Institute; Reno; Nevada; USA
4. Department of Geosciences; Oregon State University; Corvallis; Oregon; USA
5. Centre for Ice and Climate, Niels Bohr Institute; University of Copenhagen; Copenhagen; Denmark
6. Department of Atmospheric Sciences; University of Washington; Seattle; Washington; USA
7. Department of Geology and Physics; Lake Superior State University; Sault Saint Marie; Michigan; USA