UK CASE STUDIES Air Pollution Impact of Traffic (London) and Point Sources (S E England)
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1 UK CASE STUDIES Air Pollution Impact of Traffic (London) and Point Sources (S E England) Ranjeet S Sokhi, Ye Yu, Nutthida Kitwiroon, Hongjun Mao University of Hertfordshire Bernard Fisher UK Environment Agency
2 Acknowledgements EC FP6 Funding for AIR4EU TNO (CARII), FMI (CAR-FMI) UK Environment Agency UK Met Office (Douglas R Middleton) City of Westminster, London (Steve Neville)
3 Motivation How can we estimate the impact of traffic management strategies on local (street level) air quality? How do industrial points sources affect air quality on urban/regional scales? What type of methods/tools should be used?
4 Methodology Case study 1 - Impacts on the local scale Multi-model approach to achieve different levels of detail with consistent use of input data (eg( meteorology and emissions) OSCAR Air Quality Assessment System ( Case study 2 - Impacts on urban and regional scales Numerical modelling framework incorporating consistent treatment of meteorology, dispersion and chemistry within a nested domain structure Models 3 (MM5/CMAQ)
5 Case Study 1 local scale Emissions/Scenario Options 1) Technology changes and impacts on emissions 2) Reduce cars in favour of public transports, e.g., bus 3) Reduce HDVs 4) Effect of Traffic Speed on emission, hence AQ 5) Future projections 6) Effect of Background Concentrations
6 Base Case Study Study area: Marylebone Road (St canyon) Cromwell Road (Open Road) Study Year: 2002/2003 Time scale: Input Data: Pollutants: Annually (by CAR-II), Hourly (by CAR-FMI) Traffic Information to generate emissions Meteorological Data from LWC Stations BG Concentrations NO, NO 2, NOx,, PM2.5 and PM10
7 London Study Areas Cromwell Road Marylebone Road Greater London
8 OSCAR System PC OSCAR ASSESSMENT SYSTEM OSCAR RECEPTION User Options Screening High res. Open road St Canyon Network Urb. Background - Model - Measurements AQ Database Met Database Emissions/Link Database AQ data processor Met pre-processor Emissions pre-processor Level I Empirical Model Level II Models Eg CAR Int Spatial/temporal distributions CO, NO 2, PM10, PM2.5 Assessment parameters Level III Models Eg CAR-FMI, OSPM, GAMMA Scenario Analysis Numerical Models ADREA-HF, MIMO Visualisation: - Embedded - GIS (ArcMap) - VIS5D, PAVE AQ Assessment: - Limit values - Annual means Raw data: - Off line - Excel - Access Embedded PAVE, GIS CAR II WEB BASED OSCAR ASSESSMENT SYSTEM CAR-FMI
9 Evaluation OSCAR CARII + CAR-FMI CAR-FMI Hourly data from Vallila Annual means
10 Traffic Management Scenario Analysis with the OSCAR System Scenario Analysis Tool Fleet Compositions/ Traffic Information Traffic Emissions Emissions Processor Meteorological Data Air Quality Model Background Concentrations Air Quality Levels Decision Making/Policy Planning
11 Air quality improvement based on the restriction of HDV at Cromwell Road, London 2003 Air quality improvement on the basis of restriction of HDV at Cromwell Road, London 2003, (Car-International run at speed of 27km/h) Fleet composition at Cromwell, London 2003 Air quality Inprovement (%) NO2 PM10 MC Cars LGV HDV Rigid HDv Artic Buses Reduction of HDV
12 Changes of AQ Concentrations at Cromwell Road resulting from reduction in total vehicle (Hourly Average, 2003) CAR-FMI % reduction % Reduction in concentrations of Emission NO NO2 NOx CO PM2.5 5% 10% 15% 20% % Reduction of Total Vehicle
13 Example for Cromwell Road 49 Links (NO( x Concentrations) GIS display of NOx concentrations
14 Marylebone Road Air Quality Projections in OSCAR Reduction in street increment of annual NO2 and PM10 concentrations from using CAR-II NO2 PM10 50 % Reduction
15 Sensitivity to BG Concentrations Case study 1. Base case NO2 from N Kensington O3 BG (ug/m3) NO2 BG (ug/m3) NO2 BG from Brent O3 and NO2 from N Kensington O3 and NO2 from Brent 42 34
16 Sensitivity to BG Concentrations CARII Base case BG Concentrations of O3 is 61 ug/m 3, NO2 is 36 ug/m % Change of NO 2 concentration Fixed O3, NO2 36 to 44 as N Kensington Fixed O3, NO2 36 to 34 as Brent O3 61 to 37, NO2 36 to 44 as N Kensington O3 61 to 42, NO2 36 to 34 as Brent
17 Case Study 2 - Overall objective To demonstrate the use of advanced 3-D 3 D air quality models as a tool for assessing the potential contribution of industrial emissions to near surface pollutant levels under different meteorological conditions
18 MM5/CMAQ Modelling System MM5 Meteorological Model ECMWF Reanalysis (1 degree resolution, every 6 hour) CORINE land cover data (100 m resolution) Biogenic emission MCIP Meteorology-Chemistry Interface Processor SMOKE Emission processor CMAQ Community Multiscale Air Quality Modelling System EMEP (A,M) NAEI (A,M,P) EPER (P) reformat Hourly 3-D Gridded Concentrations
19 Experiment design Simulation periods (two episodes): a. 12 UTC 22 Jun -12 UTC 28 Jun 2001: Summer O 3 and NO 2 episode b. 00 UTC 09 Dec 00 UTC 15 Dec 2001: Winter NO 2 episode Exp. A B Input Emissions Base case, All emissions Remove emissions from all UK point sources Period a, b a, b Contribution from point sources = A-B
20 CMAQ Model Configuration Initial and boundary conditions: Monthly averaged concentrations of species from global 3-D chemicaltransport model STOCHEM Chemical mechanism: CB-IV Grid Δx (km) N x N y vertical layers /72 54/88 Dec For June 2001
21 Contribution of UK industrial point sources to near surface O 3 [O 3 ] exp.a -[O 3 ] exp.b (June 2001) High pollution day Normal pollution day daily maximum 8-h running mean
22 Contribution of UK industrial point sources to near surface NO 2 (Daily maximum NO 2 ) June 2001 Green box marks the area shown on left. Dec. 2001
23 Percentage contribution of all UK point sources to near surface pollutant concentrations (averaged over domain 4) km 9-km Daily Maximum 1-hr NO km 9-km Daily Maximum 1-hr SO % % Jun 25-Jun 26-Jun 27-Jun 0 24-Jun 25-Jun 26-Jun 27-Jun km 9-km Daily Maximum 8-hr mean O km 9-km 24-h average PM10 60 % 0 24-Jun 25-Jun 26-Jun 27-Jun % Jun 25-Jun 26-Jun 27-Jun
24 Conclusions Assessment models should be fit for the purpose Multi-model approach is often necessary for assessment Models should be evaluated for situations which are similar to the applications of interest Where possible use consistent set of input data for models Background stations should be chosen carefully Advanced modelling approaches (eg( nested Eulerian models) should be used for detailed assessments involving complex physical/chemical interactions over multiple scales
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