Hannah Field, Appalachian State University, Boone, NC, United States, William H Armstrong Jr, Appalachian State University, Geological and Environmental Sciences, Boone, NC, United States, Matthias Huss, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland and Regine Hock, Univ of AK-Geophysical Inst, Fairbanks, AK, United States