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

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Presentation transcript:

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

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) Model ADMS-Urban Model Methodology

Model verification at AURN Sites – PM 10 & PM 2.5 London (2001) PM 10 PM 2.5 Annual Mean90.4 th percentile

Contributions of source groups to total PM 10 concentrations 2010

Source apportionment of PM 10 from vehicle exhaust emissions 2010

Source apportionment of PM 10 traffic emissions. Mean all London AURN sites

MeasuredModelled Annual average (µg/m³) No. exceedences of 50µg/m³ st percentile of daily averages (equivalent to 35 exceedences) Marylebone Road 2001 – Modelled time series and Number of exceedences of limit values

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

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

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

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

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

Non-exhaust study- Resuspension Estimated from measurements at Marylebone Road & Bloomsbury. E TOTAL, NON-EX = E TYRE + E BRAKE + E ROAD + E RESUSP E TYRE, EB RAKE & E ROAD determined using several methods –Existing EMEP method –RAINS database –CEPMEIP database PM 2.5 = exhaust (94%), PM = non-exhaust + exhaust (6%) E RESUSP dominated by HDV 116mg/km,(LDV 0.02mg/km)

Non-exhaust study - dispersion modelling sites 4 TRAMAQ sites ( Birmingham Selly Oak, Park Lane, Elephant and Castle, High Holborn) –PM 10 and PM 2.5 –Kerbside and background –Chemical component data available 9 London DEFRA sites –2 with PM 10 and PM 2.5 –7 with PM 10 only

Non-exhaust study Road Traffic Emission totals 2002 London

Traffic source contribution to modelled concentrations (London 2002) PM 10 PM 2.5 PM coarse

Non-Exhaust study Dispersion modelling - PM 10 Annual average PM 10 concentrations

Annual average PM 2.5 concentrations Non Exhaust Study Dispersion modelling - PM 2.5

Non-exhaust study Dispersion modelling - source apportionment Annual average PM 10 concentrations

Non-exhaust study: Resuspension – Uncertainty Dependence on wind speed

Non-exhaust study Resuspension Uncertainty - source properties

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