Sources and sinks of urban aerosols
In a novel approach, this project will use existing fast response instruments on a high-level construction crane to measure the vertical fluxes of aerosols in the turbulent boundary-layer above the buildings of a major city. The measurements will provide size resolved 30-minute average fluxes of atmospheric particles in the size range 100 nm to 5 Ám, and possibly beyond 5Ám, from a 1 km2 to 10 km2 footprint. Using such methods in the turbulent boundary-layer, the project will quantify the net vertical production of aerosols by mechanical or biological activity within the city and the chemical production within the urban boundary-layer. The relationships between the measured fluxes and the major variables will be examined.
The urban measurements will be contrasted with similar flux measurements within the urban plume from the same city but at a distance of 20 km downwind. The degree to which the chemical nature of the aerosol is modified by gas-to-particle conversions will be assessed by comparing the particle size-spectra at the two sites and correlating them with precursor gas concentrations. In this way, the project will study the underlying physics of aerosol production, transport and deposition to identify the large scale processes of aerosol production in urban areas and will quantify the fate downwind.
April 1998 Two years
NERC Centre for Ecology and Hydrology, Edinburgh
University of Manchester Institute of Science and Technology
NERC British Antarctic Survey
Further information is available from the following contacts:
Lead Researcher: Prof D Fowler
Tel: 0131 445 4343, Fax: 0131 445 3943, e-mail: email@example.com
URGENT Programme Manager: Graham Leeks
Tel: 01491 692203, Fax: 01491 692313, e-mail: firstname.lastname@example.org