Abstract
Abstract Fog, cloud, and precipitation caused by the petrochemical plants in Edmonton, Canada, were studied on some of the coldest days of four winters. Typical morning temperatures were between –15 and –40° C. The investigation includes a comprehensive heat and vapour emission inventory, field studies of the local cloud physics, and observations of plume cloud dispersal and precipitation formation. Five field trips are discussed in detail. The emission inventory indicated that the petrochemical plants released heat and vapour at a rate comparable to that of the city of a half million people. Thermal circulations in the industrial area were substantial but they were not strong enough to prevent some restriction of visibility when temperatures fell below –25° C, and an area‐wide restriction of visibility as deep ice fog set in at temperatures below –35°C. Widespread cloudiness caused by plant plumes was found to be caused by the combined influence of low temperatures and low wind speeds. Snowfall rates wer...
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