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Canadian monthly surface pressure Victoria Slonosky* and Edward Graham** Environment Canada

Canadian monthly surface pressure Victoria Slonosky* and Edward Graham** Environment Canada. Stations Sources Problems Grids and Analysis. *McGill University, Ouranos Consortium for Regional Climate change and Adaptation ** University of Fribourg , Switzerland. Sources.

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Canadian monthly surface pressure Victoria Slonosky* and Edward Graham** Environment Canada

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  1. Canadian monthly surface pressureVictoria Slonosky* and Edward Graham**Environment Canada • Stations • Sources • Problems • Grids and Analysis *McGill University, Ouranos Consortium for Regional Climate change and Adaptation ** University of Fribourg , Switzerland

  2. Sources • World Weather Records & Monthly Climatic Data for the World • GHCN • Canadian database (hourly synoptic since 1953) • Miscellaneous: • CRU/Phil Jones • Royal Engineers • Canadian archives (Environment Canada, McGill University) • 19th century Canadian scientific journals • Phil Trans Roy Met Soc • Academie Royale des Sciences

  3. Common problems • Unreported (?) changes in station location and/or station elevation: real relocations? • “sea” and “station” transposed (Greenland) • Confusion between “sea” and “station” • Confusion between feet and metres • Conversion/rounding errors • “50-foot” rule (WMO directive?) 1976 • Sea level plateau corrections • Random differences between GHCN and WWR

  4. Area-average anomalies

  5. Future Plans • Analysis of pressure patterns, variability, association with temperature and precipitation • Daily data • 18th and 19th century data (Montreal, Quebec City, Atlantic Canada…)

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