Katherine R Barnhart, University of Colorado at Boulder, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, Gregory E Tucker, Univ Colorado, Boulder, CO, United States, Sandra G Doty, Univ of Colorado, Boulder, CO, United States, Charles M. Shobe, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, Rachel Glade, Los Alamos National Laboratory, Los Alamos, NM, United States, Matthew Rossi, University of Colorado, Earth Lab and CIRES, Boulder, CO, United States and Mary C Hill, University of Kansas, Geology, Lawrence, KS, United States