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 Columbia Mike Cubison, Jose-Luis Jiminez Colorado University Doug Worsnop, Aerodyne

2. Whistler Peak (2182 m) Measurements since 2002: Trace Gases: O 3, 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 μ m) 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 Anne Marie Macdonald CO (ppbv) O 3 (ppbv)

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

5. High-Resolution Time-of-Flight AMS Regional? Organic Influence Long-Range Transport Event of Sulfate Aaron van DonkelaarQi Zhang and John Liggio SO 4 2- (ug m -3 ) May 14 May 15 May 16 GEOS-Chem (2 km)

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

7. Airborne measurements from a Cessna 207 Richard Leaitch 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)

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

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

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

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 Aaron van Donkelaar and Richard Leaitch AMS measurements scaled using PCASP size distribution (assume internally mixed) to total mass concentration for comparison with GEOS-Chem Likely an upper limit Sulfate Organic Nitrate

14. April 22-25 Plume: Sulfate Primarily of Asian Origin SO 4 2- (ug/m 3 ) Aaron van Donkelaar Simulations use 2006 Asian emissions GEOS- Chem No Asia AMS scaled (using PCASP) likely an upper limit GEOS-Chem at 675 hPa on April 24 East Asian SO 4 2- (ug m -3 )

15. Sulfate is a Major and Growing Contributor to AOD Aerosol Optical Depth % simulated AOD from SO 4 = MODIS GEOS-Chem (2006 Asian Emissions) Aaron van Donkelaar INTEX-B Average

16. Asian Emissions and Lightning NO x Contribute to O 3 Observed on West Coast Thomas Walker GEOS-Chem (2006 emis) GEOS-Chem (No lightning) GEOS-Chem (No Asian NOx) Measured

17. Asian and Lightning NOx Emissions Contribute to the OMI Ozone Columns Thomas Walker GEOS-Chem (2006 NOx Emis) GEOS-Chem (2006 – No Asian NOx) GEOS-Chem (2006 – No Lightning) OMI / MLS Tropospheric Residual Trop O 3 (DU) ΔTrop O 3 (DU)

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