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THE REGENTS PARK AND TOWER ENVIRONMENTAL EXPERIMENT REPARTEE 2006 & 2007

THE REGENTS PARK AND TOWER ENVIRONMENTAL EXPERIMENT REPARTEE 2006 & 2007. Roy M. Harrison University of Birmingham. PARTICIPANTS IN REPARTEE. Institution Role University of Birmingham Project management Soluble ions ATOFMS NO, NO 2 , O 3 , SMPS

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THE REGENTS PARK AND TOWER ENVIRONMENTAL EXPERIMENT REPARTEE 2006 & 2007

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  1. THE REGENTS PARK AND TOWER ENVIRONMENTAL EXPERIMENTREPARTEE 2006 & 2007 Roy M. Harrison University of Birmingham

  2. PARTICIPANTS IN REPARTEE InstitutionRole University of Birmingham Project management Soluble ions ATOFMS NO, NO2, O3, SMPS University of Manchester Aerosol fluxes HR-AMS Centre for Ecology & Hydrology, Particle fluxes Edinburgh & Lancaster University Gas fluxes (PTR-MS) Particle and gas chemistry AMS Kings College, London Electron microscopy of particles University of Cambridge NO3 and N2O5 measurement University of Reading & Meteorological measurements including University of Salford Doppler Lidar University of Bristol Field dispersion of inert tracer

  3. REPARTEE OBJECTIVES OF REPARTEE • To study aerosol chemical and dynamical processes within the atmosphere of central London in three spatial dimensions. • To measure the fluxes of selected aerosol and gas phase species above the city, and where possible to compare fluxes with estimates derived from emissions inventories. In this context, the work was coordinated with that on the CityFlux project in which fluxes were determined over a number of UK cities. • To quantify gradients in selected aerosol and trace gas species from ground-level to altitudes of sampling on the BT tower and to use such information to better understand the respective roles of local emissions, local transformations and regional transport of pollutants in influencing the composition within and above London.

  4. REPARTEE • OBJECTIVES OF REPARTEE – cont’d • To study the structure of the atmospheric boundary layer and the influence of boundary layer vertical structure upon trace gas and aerosol fluxes and air pollution processes. • To deploy purposeful tracer releases at ground level while monitoring at the surface and aloft in order to evaluate the dispersion of trace gases released at low level within the city. • To determine spatial differences in aerosol particle size distributions and to interpret those differences in terms of the sources and physico-chemical transformations responsible. • To study the properties of nitrate aerosol in the atmosphere of London, together with mechanisms of formation, physico-chemical properties and dynamics of nitrate particles. • To throw new light on the source apportionment of PM1, PM2.5 and PM10 in the atmosphere of London.

  5. THE SAMPLING SITES

  6. Map of Central London

  7. BT TOWER Meteorological instruments and fast response pollution sensors Height of most instruments

  8. REGENTS PARK FROM THE TOWER

  9. MARYLEBONE ROAD

  10. NORTH KENSINGTON

  11. Doppler Lidar Measurements • Universities Facilities for Atmospheric Measurement (UFAM) • 1.5 micron scanning Doppler lidar (Halo-photonics) • 24th Oct to 14th Nov 2007 • vertical stare • 30 m resolution gates • integration every 4 sec • backscatter • along beam Doppler velocity (vertical component)

  12. Mass and Major Component Chemical Data

  13. REPARTEE DATES REPARTEE I 27 Sept-23 Oct 2006 REPARTEE II 16 Oct – 11 Nov 2007 Air masses during REPARTEE I Mainly maritime, except 11-12 Oct : arrives over France 14-17 Oct : from Poland over near continent

  14. DATA FROM THE AEROSOL TIME-OF-FLIGHT MASS SPECTROMETER AND AEROSOL MASS SPECTROMETER

  15. Time series of AMS nitrate and ATOFMS nitrate particle count, London, 2006

  16. Time series of two nitrate particle types, London, 2006

  17. Mass spectra of two nitrate particle types measured in London, 2006

  18. Time series demonstrating the semi-volatility of type 2 nitrate

  19. Particle Size Distributions – SMPS data

  20. Conclusions • The experiments have proved powerful in identifying spatial patterns in pollutant concentrations and size distributions, and in elucidating atmospheric physico-chemical processes. • Work on vertical gradients has been especially informative. • Particle size distributions are highly dynamic and site-dependent. • There are many other aspects to the experiment which my colleagues will report upon.

  21. ACKNOWLEDGEMENTS • Funding: • National Environment Research Council and the BOC Foundation. • Science Contributions: • Dr Manuel Dall’Osto • Mr Alistair Thorpe • Dr David Beddows • Numerous collaborators from other institutes

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