I thank J. Li for assistance in data analyses, R. Pettipas for providing the frontal analysis data, and J. Helbig for useful comments. Helpful suggestions were received from the two anonymous reviewers. The project was funded through the Climate Change Impacts on the Energy Sector Program of the (Canadian) Federal Program for Energy, Research and Development (PERD), the Offshore Environmental Factor Program of PERD, and the GRIP Fund of the Canadian Space Agency. The T/P data were obtained from NASA Jet Propulsion Laboratory and Pathfinder Project.
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