James B Burkholder¹, Aparajeo Chattopadhyay², Emmanuel Assaf², Patrick R Veres³ and J A Neuman⁴, (1)NOAA Boulder, ESRL/CSD, Boulder, CO, United States, (2)Cooperative Institute for Research in Environmental Sciences (CIRES), NOAA Boulder, ESRL/CSD, Boulder, CO, United States, (3)Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States, (4)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States