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Atmospheric chemistry and physics in the atmosphere of a developed megacity (London): an overview of the REPARTEE experiment and its conclusions

Harrison, R.M.; Dall'Osto, M.; Beddows, D.C.S.; Thorpe, A.J.; Bloss, W.J.; Allan, J.D.; Coe, H.; Dorsey, J.R.; Gallagher, M.; Martin, C.; Whitehead, J.; Williams, P. I.; Jones, R.L.; Langridge, J.M.; Benton, A.K.; Ball, S.M.; Langford, B.; Hewitt, C.N.; Davison, B.; Martin, D.; Petersson, K.; Henshaw, S.J.; White, I.R.; Shallcross, D.E.; Barlow, J.F.; Dunbar, T.; Davies, F.; Nemitz, E.; Phillips, G.J.; Helfter, C.; Di Marco, C.F.; Smith, S.. 2011 Atmospheric chemistry and physics in the atmosphere of a developed megacity (London): an overview of the REPARTEE experiment and its conclusions. Atmospheric Chemistry and Physics Discussions, 11 (11). 30145-30271. 10.5194/acpd-11-30145-2011

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Abstract/Summary

The Regents Park and Tower Environmental Experiment (REPARTEE) comprised two campaigns in London in October 2006 and October/November 2007. The experiment design involved measurements at a heavily trafficked roadside site, two urban background sites and an elevated site at 160–190 m above ground on the BT Tower, supplemented in the second campaign by Doppler lidar measurements of atmospheric vertical structure. A wide range of measurements of airborne particle physical metrics and chemical composition were made as well as measurements of a considerable range of gas phase species and the fluxes of both particulate and gas phase substances. Significant findings include (a) demonstration of the evaporation of traffic-generated nanoparticles during both horizontal and vertical atmospheric transport; (b) generation of a large base of information on the fluxes of nanoparticles, accumulation mode particles and specific chemical components of the aerosol and a range of gas phase species, as well as the elucidation of key processes and comparison with emissions inventories; (c) quantification of vertical gradients in selected aerosol and trace gas species which has demonstrated the important role of regional transport in influencing concentrations of sulphate, nitrate and secondary organic compounds within the atmosphere of London; (d) generation of new data on the atmospheric structure and turbulence above London, including the estimation of mixed layer depths; (e) provision of new data on trace gas dispersion in the urban atmosphere through the release of purposeful tracers; (f) the determination of spatial differences in aerosol particle size distributions and their interpretation in terms of sources and physico-chemical transformations; (g) studies of the nocturnal oxidation of nitrogen oxides and of the diurnal behaviour of nitrate aerosol in the urban atmosphere, and (h) new information on the chemical composition and source apportionment of particulate matter size fractions in the atmosphere of London derived both from bulk chemical analysis and aerosol mass spectrometry with two instrument types.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acpd-11-30145-2011
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Chemistry and Past Climate
CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett (to November 2013)
ISSN: 1680-7367
Additional Information. Not used in RCUK Gateway to Research.: Open Access article - click on the Official URL link for full text
NORA Subject Terms: Atmospheric Sciences
Date made live: 24 Nov 2011 17:00
URI: http://nora.nerc.ac.uk/id/eprint/15958

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