Alice K DuVivier¹, Marika M Holland², Irina Overeem³, Laura Landrum⁴ and Kristen M. Krumhardt⁴, (1)University Corporation for Atmospheric Research, Boulder, CO, United States, (2)Natl Ctr Atmospheric Research (NCAR), Boulder, United States, (3)University of Colorado, Department of Geological Sciences and Institute of Arctic and Alpine Research, Boulder, United States, (4)NCAR, Boulder, United States