Nadine de Bruyn¹, Thomas Walker², Helen Marie Worden³, Dejian Fu⁴, Merritt N Deeter³ and James R Drummond⁵, (1)Carleton University, Department of Civil & Environmental Engineering, Ottawa, ON, Canada, (2)Carleton University, Department of Civil and Environmental Engineering, Ottawa, ON, Canada, (3)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling Laboratory, Boulder, CO, United States, (4)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (5)Dalhousie University, Halifax, NS, Canada