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Canadian Acid and Toxic Deposition

A comprehensive overview of Canadian acidifying emissions program, monitoring networks, and modeling efforts. Current initiatives, goals, and importance for Lake Champlain region. Future directions and potential recommendations for toxic deposition issues.

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Canadian Acid and Toxic Deposition

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  1. Canadian Acid and Toxic Deposition • Brief Overview of: • Current programmatic efforts/goals • Linkage to the Lake Champlain Region J. R. Brook Meteorological Service of Canada Toronto, Ontario June 2003

  2. Canadian Acidifying Emissions Program • Viewed as one of our most "mature issues" • Completed last assessment in 1997. • Third phase of the formal research program funded through March 2005 under the "Acid Rain Business Case". • Third Assessment Report to be released in 2004.

  3. Third phase of the formal research program • Continued atmospheric monitoring at the Federal level (MSC) • reduced provincial contribution • some continued aquatic and terrestrial effects monitoring • spatial mapping and trend analysis • Deposition research focus embraces the "critical loads concept" and subsequent needs for quantification of total deposition

  4. Canadian Air and PrecipitationMonitoring Network(CAPMoN) • Nation-wide coverage (sparse in some areas) • Daily air and precip. sampling • Data managed as part of NatChem • Nearest sites to Lake Champlain: • Sutton/Frelighsburg Quebec - in the watershed • Chalk River Ontario - one of the longest, if not the longest, daily sulfate time series in N.A.

  5. Goals of CAPMoN and NatChem Research • Trends and mapping for tracking of progress • Support of effects research • Quantification of dry deposition • Special studies addressing full accounting of oxidized and reduced nitrogen deposition • Limited research on fog/cloud deposition • O3 measurements at some sites and now adding PM2.5

  6. Acidifying Emissions Modeling • Establishment of MSC Model Applications Group based at CMC in Montreal. • Ongoing applications of ADOM for selected scenarios • CHRONOS O3 predictions in real-time • Beta-testing PM2.5 predictions • Use of NOy predictions to study spatial variability in dry deposition to total N input • AQRB in Toronto developing AURAMS for future acid deposition modeling • tech-transfer to CHRONOS

  7. Acidifying Emissions Modeling • Continued improvement of accuracy, completeness and speed of production of emissions inventory. • ***Merging of Canadian and U.S. inventories for model applications • 1995 still the most recent year, but 2000 is on the way

  8. Acidifying Emissions - Future Directions ??? • Being developed for recommendations of upcoming assessment • More of the same??? • Better links with effects research so we can determine if the present and projected deposition is/will be low enough to avoid undesirable ecosystem health and economic impacts

  9. Toxic Deposition • Integrated Atmospheric Deposition Network (IADN) • Focus on the Great Lakes (U.S. and Canada) • POPs and mercury (Pt. Petri is nearest site) • New LOADING report being prepared and program is under review • CAMNET • Canadian Mercury Network • Quebec Region is active. St. Anicet is one of the nearest sites.

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