1. Department of Geography, Kansas State University, Manhattan, Kansas 66506, United States
2. Department of Geology & Environmental Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
3. Environmental Monitoring and Science Division, Alberta Environment and Parks, Government of Alberta, Edmonton, Alberta T5J 5C6, Canada
4. Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
5. Environmental Monitoring and Science Division, Alberta Environment and Parks, Government of Alberta, Calgary, Alberta T2E 7J2, Canada