Anna Hermes^1,2, Stefania Mambelli³, Wenbo Yang³, Todd E Dawson^3,4 and Eve-Lyn S Hinckley^1,2, (1)University of Colorado at Boulder, Environmental Studies Program, Boulder, CO, United States, (2)University of Colorado at Boulder, Institute of Arctic and Alpine Research, Boulder, CO, United States, (3)University of California Berkeley, Center for Stable Isotope Biogeochemistry, Berkeley, CA, United States, (4)University of California Berkeley, Integrative Biology, Berkeley, CA, United States