1. University of Toronto Scarborough, Department of Physical and Environmental Sciences, 1265 Military Trail, Toronto, ON, Canada, M1C 1A4, Stockholm University, Department of Applied Environmental Science (ITM), Stockholm SE-106 91, Sweden, LS McCarty Scientific Research & Consulting, 1115 Quaker Trail, Newmarket, ON, Canada, L3X 3E2, and Canadian Centre for Environmental Modelling and Chemistry, Trent University, 1600 West Bank Drive, Peterborough, ON, Canada