1. Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2, Freshwater Institute, Fisheries & Oceans Canada, 501 University Crescent, Winnipeg, Manitoba, Canada, R3T 2N6, and Institute of Ocean Sciences, Fisheries & Oceans Canada, 9860 West Saanich Road, P.O. Box 6000, Sidney, British Columbia, Canada, V8L 4B2