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Aerosol Simulation Over North America

Aerosol Simulation Over North America. Aaron Van Donkelaar April 2005. Remote Sensing of Surface Particulate Matter. M –mass loading ρ – particle mass density r – effective radius (AERONET) τ – aerosol optical depth (MODIS/GEOS-CHEM) Q ext – extinction factor (AERONET)

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Aerosol Simulation Over North America

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  1. Aerosol Simulation Over North America Aaron Van Donkelaar April 2005

  2. Remote Sensing of Surface Particulate Matter • M –mass loading • ρ– particle mass density • r – effective radius (AERONET) • τ– aerosol optical depth (MODIS/GEOS-CHEM) • Qext– extinction factor (AERONET) • Z – air mass height (GEOS-CHEM)

  3. GEOS-CHEM v7-02-01, July 2002 GEOS-CHEM Underestimates AOD AERONET, July 2002 MODIS, July 2002 Optical Depth at 550nm [unitless]

  4. GEOS-CHEM Organic Carbon Too Low IMPROVE Mass Concentrations [ug/m3] July 2002 GEOS-CHEM v7-02-01 Mass Concentrations [ug/m3] July 2002

  5. June, 2002 May, 2002 April, 2002 August, 2002 September, 2002 July, 2002 Summer Organic Carbon Bias GEOS-CHEM – IMPROVE [ug/m3]

  6. Low OC Yield from Isoprene • Matsunaga, S. N. et al. Isoprene oxidation products are a significant atmospheric aerosol component. in prep. • Claeys, M. et al. Formation of secondary organic aerosols from isoprene and its gas-phase oxidation products through reaction with hydrogen peroxide. Atmospheric Environment. • Claeys, M. et al. Formation of Secondary Organic Aerosols Through Photooxidation of Isoprene. Science. Recent literature has proposed OC yield from isoprene Guenther has suggested specific pathways Assume 1% to 3% Yield

  7. May, 2002 June, 2002 July, 2002 September, 2002 August, 2002 OC from Isoprene Corrected Bias-remaining bias from biomass burning regions April, 2002 GEOS-CHEM – IMPROVE [ug/m3]

  8. GEOS-CHEM w Isoprene Yield, July 2002 OC Does Not Correct AOD Bias AERONET, July 2002 MODIS, July 2002 Optical Depth at 550nm [unitless]

  9. NH4 SO4 GEOS-CHEM PILS AMS NO3 OC Preliminary Vertical Structure Evaluation - ICARTT

  10. Summary • Low yield OC production from isoprene corrects seasonal bias • Biomass burning inventories for 2002 are needed • Continue to evaluate model vertical structure using ICARTT data

  11. Acknowledgements • Randall Martin • Alex Guenther • Rokjin Park • Solene Turquety • Easan Drury

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