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Source apportionment of PM in the ADMS model David Carruthers

Source apportionment of PM in the ADMS model David Carruthers. Workshop on Source Apportionment of Particulate Matter Imperial College London Friday, 23 April 2010. Contents. Modelling methodology London Marylebone Road Resuspension Other. Model ADMS-Urban Model Methodology.

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Source apportionment of PM in the ADMS model David Carruthers

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  1. Source apportionment of PM in the ADMS model David Carruthers Workshop on Source Apportionment of Particulate Matter Imperial College London Friday, 23 April 2010

  2. Contents • Modelling methodology • London • Marylebone Road • Resuspension • Other

  3. Model ADMS-Urban Model Methodology • Models all source groups within the urban area – typically hour by hour calculation • Explicitly models major road sources, major industrial sources. Includes street canyon model • Other sources modelled as grid sources (e.g.1km* 1km • Regional pollution from rural monitoring sites or from larger area model (e.g. WRF/CMAQ or Pre’vair/Chimere)

  4. Model verification at AURN Sites – PM10 & PM2.5London (2001) PM10 Annual Mean 90.4th percentile PM2.5

  5. Contributions of source groups to total PM10 concentrations 2010

  6. Source apportionment of PM10 from vehicle exhaust emissions 2010

  7. Source apportionment of PM10 traffic emissions. Mean all London AURN sites

  8. Marylebone Road 2001 – Modelled time series and Number of exceedences of limit values

  9. Marylebone Road Source contributions to modelled annual average PM10 concentration Source contribution of vehicle types

  10. Modelled source contributions to modelled daily average PM10 concentrations, Marylebone Road 2001

  11. Source contributions to exceedences of the 50µg/m³ objective value, ordered by background contribution and major road contribution

  12. Major road and background contribution compared to total concentration Comparison of major road and rural background concentrations

  13. Non-Exhaust Emissions of PM • DEFRA Project –TRL, University of Birmingham, CERC • Review of methodologies for tyre wear, brake wear and road wear • Focus resuspension

  14. Non-exhaust study- Resuspension • Estimated from measurements at Marylebone Road & Bloomsbury. ETOTAL, NON-EX = ETYRE + E BRAKE + EROAD + ERESUSP • ETYRE, EBRAKE & EROADdetermined using several methods • Existing EMEP method • RAINS database • CEPMEIP database • PM2.5 = exhaust (94%), PM2.5-10 = non-exhaust + exhaust (6%) • ERESUSP dominated by HDV 116mg/km,(LDV 0.02mg/km)

  15. Non-exhaust study - dispersion modelling sites • 4 TRAMAQ sites (Birmingham Selly Oak, Park Lane, Elephant and Castle, High Holborn) • PM10 and PM2.5 • Kerbside and background • Chemical component data available • 9 London DEFRA sites • 2 with PM10 and PM2.5 • 7 with PM10 only

  16. Non-exhaust study Road Traffic Emission totals 2002 London

  17. Traffic source contribution to modelled concentrations (London 2002) PM10 PMcoarse PM2.5

  18. Non-Exhaust studyDispersion modelling - PM10 Annual average PM10 concentrations

  19. Non Exhaust StudyDispersion modelling - PM2.5 Annual average PM2.5 concentrations

  20. Non-exhaust studyDispersion modelling - source apportionment Annual average PM10 concentrations

  21. Non-exhaust study: Resuspension – UncertaintyDependence on wind speed

  22. Non-exhaust study Resuspension Uncertainty - source properties

  23. Singapore Harrison Chemical Speciation model based on chemical sampling vs PM measurements

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