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Canadian Contribution to INTEX-B: Overview of Measurements and Findings

This overview highlights the Canadian contribution to the INTEX-B campaign, including measurements of trace gases, particle physics, particle chemistry, and meteorological parameters. Major findings include the influence of regional and long-range transport events, enhanced sulfate and organic aerosol concentrations, and contributions from Asian emissions and lightning NOx to ozone levels on the West Coast.

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Canadian Contribution to INTEX-B: Overview of Measurements and Findings

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  1. Overview of the Canadian Contribution to INTEX-B Randall Martin, Aaron van Donkelaar, Thomas Walker, Tom Duck Dalhousie University Richard Leaitch, Anne Marie Macdonald, Kurt Anlauf, Shao-Meng Li, Desiree Toom-Sauntry, John Liggio, Katherine Hayden, Peter Liu, Alexandra Steffen Environment Canada Qi Zhang, SUNY Albany Ian McKendry, Jeff Lundgren University of British ColumbiaMike Cubison, Jose-Luis Jimenez University of Colorado Doug Worsnop, Aerodyne

  2. Whistler Peak (2182 m) • Measurements since 2002: • Trace Gases: O3, CO, Hg (Tekran) • Particle Physics: • Particle distributions from 10nm to 20 μm • TSI SMPS (10 nm to 500 nm), Grimm OPC (400 nm to 20 μm) • Particle Chemistry: • Filter packs (inorganics, OC/EC) • High-Resolution Time-of-Flight AMS (WTOF-AMS) • Moudi impactor samples (inorganics, metals (ICP, XRF)) • Particle Light Scattering and Absorption • Nephelometer, PSAP • Temperature, Dew point, Winds • Indicates additions during the INTEX intensive Anne Marie Macdonald

  3. Whistler Peak: Intensive and Long-Term Measurements CO (ppbv) O3 (ppbv) Anne Marie Macdonald

  4. Long-term Measurements at Whistler Reveal Unusually Large Events During INTEX-B Anne Marie Macdonald

  5. May 14 High-Resolution Time-of-Flight AMSRegional? Organic InfluenceLong-Range Transport Eventof Sulfate GEOS-Chem (2 km) May 15 May 16 Qi Zhang and John Liggio Aaron van Donkelaar SO42- (ug m-3)

  6. Lidar Measurements Show Subsiding Aerosol Plume During Enhanced Sulfate Period Tom Duck

  7. Airborne measurements from a Cessna 207 • 31 project flights • Ozone - all flights • CO - 10 flights • Particle chemistry - 24 flights • (Quad-AMS and single filter for major ions) • Particle number and size - all flights • (CPC, PCASP, FSSP300) • Particle light scattering - all flights • (Radiance nephelometer) Richard Leaitch

  8. Cessna - C130, Whistler Summit Comparison: May 3rd r=0.63 slope=1.79 r=0.88 slope=1.70 r=0.91 slope=1.20 Aaron van Donkelaar and Richard Leaitch

  9. Cessna - C130, Canada-US Border Comparison: May 9th r=0.98 slope=1.28 Aaron van Donkelaar and Richard Leaitch

  10. Profile Often Revealed Enhanced Sulfate Above ~3 km and Enhanced Organic Aerosol Below Richard Leaitch

  11. Sulfate Plume at 2 km, Coincident with Summit Richard Leaitch

  12. Puzzling Organic Enhancement at 4 km Richard Leaitch

  13. Campaign Average Aerosol Profiles AMS measurementsscaled using PCASP size distribution (assume internally mixed) to total mass concentration for comparison with GEOS-Chem Likely an upper limit Sulfate GEOS-Chem Asian SO2 Emissions for 2006 275% increase over 2000 Nitrate Organic Aaron van Donkelaar and Richard Leaitch

  14. April 22-25 Plume: Sulfate Primarily of Asian Origin GEOS-Chem at 675 hPa on April 24 GEOS-Chem AMS scaled (using PCASP) likely an upper limit No Asia Simulations use 2006 Asian emissions East Asian SO42- (ug m-3) SO42- (ug/m3) Aaron van Donkelaar

  15. Sulfate is a Major and Growing Contributor to AOD INTEX-B Average Aerosol Optical Depth MODIS GEOS-Chem (2006 Asian Emissions) % simulated AOD from SO4= GEOS-Chem (2006 Asian Emissions) Aaron van Donkelaar

  16. Asian Emissions and Lightning NOx Contribute to O3 Observed on West Coast Measured GEOS-Chem (2006 emis) GEOS-Chem (No lightning) GEOS-Chem (No Asian NOx) Thomas Walker

  17. Asian and Lightning NOx Emissions Contribute to the OMI Ozone Columns OMI / MLS Tropospheric Residual GEOS-Chem (2006 NOx Emis) Trop O3 (DU) GEOS-Chem (2006 – No Asian NOx) GEOS-Chem (2006 – No Lightning) ΔTrop O3 (DU) Thomas Walker

  18. Posters Richard Leaitch et al., Summary of the Canadian airborne measurements during INTEX-B Anne Marie Macdonald et al., Overview of measurements at Whistler Peak during INTEX-B John Liggio et al., Application of principal component analysis to aerosol mass spectrometry data from a high-elevation site in Whistler, BC Qi Zhang et al., A high-resolution time-of-flight aerosol mass spectrometer study on size-resolved aerosol composition at the peak of Whistler Mountain during INTEX-B Aaron van Donkelaar et al, Long-range transport of Asian sulfur emissions to Canada Thomas Walker et al., Long-range transport of NOy and O3 during INTEX-B: Satellite, aircraft, and model perspectives Funding NSERC Environment Canada

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