Tom Goren, NOAA/CIRES, Boulder, CO, United States, Jan Kazil, NOAA/CIRES, Boulder, United States, Fabian Hoffmann, CIRES, Boulder, CO, United States, Takanobu Yamaguchi, NOAA ESRL Chemical Sciences Division / CIRES University of Colorado, Boulder, CO, United States and Graham Feingold, NOAA CSD, Boulder, CO, United States