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Source Attributions of Ambient Hydrocarbons in the South Coast Air Basin

Source Attributions of Ambient Hydrocarbons in the South Coast Air Basin. Eric Fujita Division of Atmospheric Sciences Desert Research Institute University and Community College System of Nevada Reno, Nevada SCOS97-NARSTO Data Analysis Conference Diamond Bar, CA February 13-15, 2001. 1.

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Source Attributions of Ambient Hydrocarbons in the South Coast Air Basin

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  1. Source Attributions of Ambient Hydrocarbons in the South Coast Air Basin Eric Fujita Division of Atmospheric Sciences Desert Research Institute University and Community College System of Nevada Reno, Nevada SCOS97-NARSTO Data Analysis Conference Diamond Bar, CA February 13-15, 2001 1

  2. Chemical Mass Balance • Equation: • Input: • Ambient concentrations (Cj)and uncertainties (sCj),source composition (Fij),and uncertainties (sFij). • Output: • Source contributions (Sj)and uncertainties (sSj). • Measurements: • 55 PAMS species and total NMOC

  3. CMB Model Assumptions • Compositions of source emissions are constant over the period of ambient and source sampling. • Chemical species do not react with each other (i.e., they add linearly). • All sources with a potential for significant contribution to the receptor have been identified and have had their emissions characterized. • The number of sources is less than or equal to the number of chemical species. • The source compositions are linearly independent of each other. • Measurement errors are random, uncorrelated, and normally distributed.

  4. Los Angeles, CA During 6/74 to 9/74 (Mayrsohn and Crabtree, 1976; Mayrsohn et al., 1977)

  5. Los Angeles, CA in August, 1986 Harley et al., 1992

  6. 1987 Southern California Air Quality Study Fujita et al., 1994

  7. SoCAB in Summer 1995 Fujita et al., 1997

  8. LD/HD Speciated Emissions

  9. LD/HD Fuel-Specific Emissions Data courtesy of J. Sagebiel

  10. Vehicle Emission Rates Measured in Tunnels (mg/mi) Data courtesy of Gertler et al., Desert Research Institute

  11. 1998 Central Texas On-Road Hydrocarbon StudyWeight Fractions of PAMS Species in On-Road Vehicle Emissions and Morning and Afternoon Regional Background

  12. 1998 Central Texas On-Road Hydrocarbon StudyWeight Fractions of PAMS Species in Morning and Afternoon Regional Background and Atmospheric Lifetimes (Hours)

  13. Source Contribution Estimates Azusa PAMS Data, Summer 1997 Preliminary

  14. Source Contribution Estimates Upland PAMS Data, Summer 1997 Preliminary

  15. Source Contribution Estimates Burbank PAMS Data, Summer 1997 Preliminary

  16. Source Contribution Estimates Pico Rivera PAMS Data, Summer 1997 Preliminary

  17. Source Contribution Estimates Hawthorne PAMS Data, Summer 1997 Preliminary

  18. Source Contribution Estimates Banning PAMS Data, Summer 1997 Preliminary

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