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JRM: HIS EARLY ACCOMPLISHMENTS, 1950S TO MID 1980S, AND HIS RESULTS, 1990-2005 Session: John Ross MacKay Symposium - Permafrost I / Symposium John Ross MacKay - Pergélisol I Hugh French, University of Ottawa/University of Victoria (Canada) Ross Mackay’s main scientific accomplishments were as a permafrost scientist working in the Western Canadian Arctic. Starting in 1951, he would spend approximately 3 months in the field each year for more than 40 years. He described many geographical features including the closed-system pingos of the Mackenzie Delta. In 1968, when the PCSP Western Arctic logistics base moved to Tuktoyaktuk, he commenced long-term permafrost studies in the delta region. His research added significantly to our general understanding of permafrost terrain, the nature of ground ice, the controls over permafrost distribution, the dynamics of the active layer and the effects of natural and man-induced disturbances to the tundra and arctic ecosystems.
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