HR: 0800h
AN: A11B-0880    [Abstracts]
TI: Tracer dispersion experiments carried out in London during 2003 and 2004 as part of the DAPPLE project
AU: * Martin, D
EM: D.Martin@bristol.ac.uk
AF: University of Bristol, Department of Chemistry, Cantocks Close, Bristol, BS8 1TS United Kingdom
AU: Shallcross, D
EM: Dudley Shallcross d.e.shallcross@bristol.ac.uk
AF: University of Bristol, Department of Chemistry, Cantocks Close, Bristol, BS8 1TS United Kingdom
AU: Nickless, G
EM: Graham Nickless Grah.Nickless@bristol.ac.uk
AF: University of Bristol, Department of Chemistry, Cantocks Close, Bristol, BS8 1TS United Kingdom
AU: White, I
EM:
AF: University of Bristol, Department of Chemistry, Cantocks Close, Bristol, BS8 1TS United Kingdom
AB: Transport, dispersion and ultimate fate of pollutants has very important implications for the environment at the urban, regional and global scales. Localised emissions of both man-made and naturally produced pollutants can both directly and indirectly impact the health of the inhabitants. The DAPPLE (Dispersion of Air Pollutants and their Penetration into the Local Environment) consortium consists of six universities, which comprises of a multidisciplinary approach to study relatively small-scale urban atmospheric dispersion. Wind tunnel modelling studies, computer fluid dynamical simulations, fieldwork studies using tracers and dispersion modelling were all carried out in an attempt to achieve this. In this paper we report on tracer dispersion experiments carried out in May 2003 and June 2004. These involve the release of various perfluorocarbon (PFC) tracers centred on Marylebone Road in London. These compounds are inert, non-reactive and have a very low atmospheric background concentration with little variability. These properties make them the ideal atmospheric tracer and this combined with an ultra sensitive analytical technique (sample pre-concentration on carbon based adsorbents followed with detection by Negative Ion Chemical Ionization Mass Spectrometry) makes very small release amounts feasible. The source-receptor relationship is studied for various source and receptor positions and distances. Source receptor relationships for both rooftop and indoor positions were evaluated as part of the project. Results of concurrent meteorological measurements are also presented as well as comparison with a number of simple dispersion models.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005