Alice K DuVivier, University Corporation for Atmospheric Research, Boulder, CO, United States, Marika M Holland, Natl Ctr Atmospheric Research, Boulder, CO, United States, Simone Tilmes, National Center for Atmospheric Research, Atmospheric Chemistry, Observations, and Modeling Laboratory, Boulder, CO, United States, Jennifer E Kay, Univeristy of Colorado at Boulder, Boulder, CO, United States, Andrew Gettelman, NCAR, Boulder, CO, United States and David A Bailey, National Center for Atmospheric Research, Boulder, CO, United States