Acknowledgments

George Isaac would like to thank his Environment Canada colleagues Monika Bailey, Faisal Boudala, Stewart Cober, Dave Hudak, Ismail Gultepe, Alexei Korolev, Peter Liu, Peter Rodriguez, and Walter Strapp, who contributed a great deal to this paper, either through unpublished conference papers or private communications. Peter Pilewskie from the University of Colorado at Boulder provided significant input to the remote sensing section.

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