1. Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, M5S 3E5, Canada, Department of Geography, University of Toronto, 100 St. George Street, Toronto, Ontario, M5S 3G3, Canada, National Water Research Institute, Canada Centre for Inland Waters, Burlington, Ontario, L7R 4A6, Canada, and MDA Consulting Limited, Unit 6A, 35 Crawford Cres., Campbellville, Ontario, L0P 1B0, Canada