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Global Dioxin Inventory and Modeling Project – Preliminary Results

Global Dioxin Inventory and Modeling Project – Preliminary Results. Anita Wong, Environment Canada Sources and Measurements Workshop CEC North American Strategy for Catalyzing Cooperation on Dioxins, Furans and HCB October 28th, 2010 Mexico City, Mexico.

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Global Dioxin Inventory and Modeling Project – Preliminary Results

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  1. Global Dioxin Inventory and Modeling Project – Preliminary Results Anita Wong, Environment Canada Sources and Measurements Workshop CEC North American Strategy for Catalyzing Cooperation on Dioxins, Furans and HCB October 28th, 2010 Mexico City, Mexico Acknowledgements: Jianmin Ma, Yi-Fan Li

  2. Purpose of Study • EC initiative to address a knowledge gap in dioxins/furans • To help guide policy decision on Canada’s domestic and international activities related to dioxins/furans • The study will: • extend our knowledge on the dioxins/furans global budget • examine pathways to the various compartments in the Canadian environment • enhance our understanding on the transboundary impact of dioxins/furans in Canada

  3. Scope of Study Two parts: • Emissions Inventory • Develop a comprehensive dioxin atmospheric emission inventory on a global scale • Regional and Global Modeling • Upgrade Environment Canada’s atmospheric transport model for persistent organic pollutants: Canadian Model for Environmental Transport of Organochlorine Pesticides (CanMETOP) to predict the atmospheric level and global transport of dioxins/furans • Collect data for input into model eg. met. data • Perform scenario runs to track major emission sources impacting Canada

  4. Emissions Inventory Preliminary results: • Based on release data publicly available (eg. Stockholm Convention) • Countries without available data are estimated by interpolation • Given that most data was collected from 2000 through 2006, the year of 2004 was set as the reference year • Estimated world total release of dioxins/furans in the reference year of 2004 is 77,400 g TEQ in which 38,200 has been emitted into air. • The gridded emission inventory has been interpolated into regional-scale (horizontal resolution 24 km  24 km) and global-scale (resolution 1o 1o latitude/longitude) atmospheric transport model grids.

  5. Total PCDD/Fs Emissions by Regions

  6. Global air emissions of dioxin in 2004

  7. CanMETOP Model

  8. Scenario Modeling • Multiple model scenario runs are set up to assess impact of dioxins/furans emissions (ITEQ and speciated) from: • the United States, East Asia (China), India, Mexico and Europe on Canadian environment • Contamination of Canadian environment was assessed by estimating the air concentrations and deposition of dioxins to surfaces (dry and wet) Preliminary results: • East Asian emissions contribute most significantly to atmospheric level of dioxins/furans in Canada through trans-Pacific atmospheric transport, especially Western Canada. • India emissions appear to exert stronger influence on the west coast of the US and Mexico than to Canada

  9. CanMETOP modeled ratios of lindane (-HCH) total (wet +dry) deposition in North America in 2005 emitted from different continental sources verses global emissions Model scenarios S1: Global emi S2: China emi only S3: India emi only S4: Europe emi only S5: Russia emi only Ratios show contribution (input) from continental sources to North America a. S2/S1 – China; b. S3/S1 – India; c. S4/S1 – Europe; d. S5/S1 – Russia

  10. Total Deposition of PCDD/Fs in Canada (pgTEQ/M2/year)

  11. Next Steps • Speciated dioxin/furan emissions inventory being developed (~ 4 congeners). • Modeling results are being evaluated to improve the emissions inventory, and subsequently refine modeling results • Model being evaluated by comparison of air concentrations with available ambient air measurement data • Perform scenario modeling using dioxin/furan congeners inventory • Modeling project anticipated to complete by Spring of 2011 • Findings to be published in a peer reviewed journal

  12. Modeling: Dr. Jianmin Ma Environment Canada Air Quality Research Division Science and Technology Branch jianmin.ma@ec.gc.ca 4905 Dufferin Street Toronto, Ontario M3H 5T4 Canada Emissions Inventory: Dr. Yi-Fan Li Environment Canada Air Quality Research Division Science and Technology Branch yi-fan.li@ec.gc.ca 4905 Dufferin Street Toronto, Ontario M3H 5T4 Canada Acknowledgements

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