1. Alaska Stable Isotope Facility, Water and Environmental Research Center, Institute of Northern Engineering University of Alaska Fairbanks Fairbanks AK USA
2. Department of Geosciences University of Alaska Fairbanks Fairbanks AK USA
3. Department of Earth and Environmental Sciences University of Ottawa Ottawa ON Canada
4. National Park Service Fairbanks AK USA
5. Department of Marine Biology, College of Fisheries and Ocean Sciences University of Alaska Fairbanks Fairbanks AK USA