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

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

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

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

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)

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

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)

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

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

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

Sulfate Plume at 2 km, Coincident with Summit Richard Leaitch

Puzzling Organic Enhancement at 4 km Richard Leaitch

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

April 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 )

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

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

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)

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