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GEM/AQ Simulations on Intercontinental Transports

GEM/AQ Simulations on Intercontinental Transports. Science and Technology Branch Environment Canada. MECHANISM FOR TRANSPACIFIC TRANSPORT OF ANTHROPOGENIC OZONE AND FINE PARTICLES. HEMISPHERIC POLLUTION. PAN (~10%) VOCs (long-lived). warm conveyor belts, convection. subsidence. O 3.

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GEM/AQ Simulations on Intercontinental Transports

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  1. GEM/AQ Simulations onIntercontinental Transports Science and Technology Branch Environment Canada

  2. MECHANISM FOR TRANSPACIFIC TRANSPORTOF ANTHROPOGENIC OZONE AND FINE PARTICLES HEMISPHERIC POLLUTION PAN (~10%) VOCs (long-lived) warm conveyor belts, convection subsidence O3 OC aerosol PAN Free troposphere SOx (~10%) sulfate O3 NOx 2 km Boundary layer entrainment, dilution NOx, SO2, VOC aerosols, HNO3 ozone, sulfate, OC ASIA PACIFIC NORTH AMERICA

  3. GEM-AQ/MACH AQ – Air Quality MACH –Modelling Air quality and CHemistry Emissions Processing System SMOKE Meteorological Model with Chemistry GEM-AQ/MACH High spatial and temporal resolutions Forecasts ozone, PM2.5, PM10

  4. GEM Global Environment Model Canadian Weather Forecast Model Global Uniform 400x200 ~ 90 km Variable Global Focused ~ 25 km Limited Area ~ 200 m

  5. Inside GEM-AQ/MACH One-step Operator Splitting: Major Point Source Emissions Flux GEM – Transports Advection Convection Vertical Diffusion Dry Deposition Velocities of Gases Gas-Phase Chemistry+ SOA formation (ADOM-II Mechanism, Odum or Jiang SOA approach) Particle micro-phys. + Cloud Processes + In. Het. Chem. (Aerosol Activation, Aqueous Chem., cloud/precipitation scavenging, evaporation ) 12 – Size bins (Nucleation + Condensation, Coagulation, Dry Dep.) ( ISORROPIA and HETV {SO4 - NO3 - NH4} ) CAM – Canadian Aerosol Module

  6. GEM/AQ Model • GEM-AQ: Global Environmental Multiscale model (EC) – with Air Quality (MAQNet) • Online gas phase chemistry and aerosol package (CAM, S. Gong, EC) • 50 gas phase species, 4 size-resolved aerosol types (12 bins each) • 5 year simulation (2001-2005) with global uniform resolution of 1.8x1.8 degrees (200x100x28L up to 10mb)

  7. Soil Dust at Surface April 1998

  8. Surface Sulphate July 1998

  9. Surface Ozone March 2000

  10. Black Carbon July 1998

  11. Sulphate Vertical Section at 40 N, July 1998

  12. Soil Dust Vertical Section at 40 N, April 1998

  13. Hemispheric Transports of Air Pollutants HTAP To characterize the contribution of inter-continental transports to the local air quality

  14. Inter-continental Transports of PCB 28 in 2000

  15. Model vs. Observations • Comparisons underway: • Ozonesonde climatology • Ozone and precursor composite data from aircraft • AURA-MLS CO • GOME tropospheric column ozone • MOPITT, SCIAMACHY, OMI…

  16. Looking up: ozonesondes • Monthly mean climatology compiled by Logan (1999) • 35 stations over the globe • Data records mostly from 1980-90’s • Compared with model results for 2001-2004 (seasonal means)

  17. Alert lori@yorku.ca

  18. Edmonton lori@yorku.ca

  19. Goose Bay lori@yorku.ca

  20. Cape Kennedy lori@yorku.ca

  21. Lindenberg lori@yorku.ca

  22. Sapporo lori@yorku.ca

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