Aerosol Simulation Over North America Aaron Van Donkelaar April 2005.

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Aerosol Simulation Over North America

AEROSOLS REDUCE ATMOSPHERIC OXIDATION

Global Climatology of Fine Particulate Matter Concentrations Estimated from Remote-Sensed Aerosol Optical Depth Aaron van Donkelaar1, Randall Martin1,2,

Global Climatology of Aerosol Optical Depth

Presentation transcript:

Aerosol Simulation Over North America Aaron Van Donkelaar April 2005

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

GEOS-CHEM Underestimates AOD MODIS, July 2002 GEOS-CHEM v , July 2002 Optical Depth at 550nm [unitless] AERONET, July 2002

GEOS-CHEM Organic Carbon Too Low GEOS-CHEM v Mass Concentrations [ug/m 3 ] July 2002 IMPROVE Mass Concentrations [ug/m 3 ] July 2002

Summer Organic Carbon Bias GEOS-CHEM – IMPROVE [ug/m 3 ] May, 2002 June, 2002 September, 2002 April, 2002 July, 2002 August, 2002

Low OC Yield from Isoprene Matsunaga, S. N. et al. Isoprene oxidation products are a significant atmospheric aerosol component. in prep. 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 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. 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

OC from Isoprene Corrected Bias -remaining bias from biomass burning regions GEOS-CHEM – IMPROVE [ug/m 3 ] April, 2002May, 2002 June, 2002 July, 2002 August, 2002 September, 2002

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

Preliminary Vertical Structure Evaluation - ICARTT NH 4 NO 3 OC SO 4 GEOS-CHEM PILS AMS

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

Acknowledgements Randall Martin Randall Martin Alex Guenther Alex Guenther Rokjin Park Rokjin Park Solene Turquety Solene Turquety Easan Drury Easan Drury