AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Seasonal Comparison of Comprehensive Aerosol Measurements in London During ClearfLo
DOMINIQUE YOUNG, James Allan, Paul Williams, Michael Flynn, Dantong Liu, James Whitehead, Niall Robinson, Andre Prévôt, Suzanne Visser, Markus Furger, Martin Gallagher, Hugh Coe, University of Manchester
Abstract Number: 113 Working Group: Urban Aerosols
Abstract A suite of state-of-the-art instrumentation, measuring aerosols, gases, radicals and meteorological parameters was deployed as part of the Clean Air for London (ClearfLo) campaign for two major intensive observation periods (IOPs) during 2012 at a number of sites in and near London. Here we report measurements from the main ClearfLo urban background supersite located in the grounds of a school in North Kensington, London for both IOPs. The winter IOP occurred took place between 11 January and 8 February and the summer IOP took place in July and August, covering the 2012 Olympic period. Measurements took place during clean westerly conditions and polluted conditions when transported European plumes influenced the site.
Comprehensive measurements of size segregated aerosol chemical composition, microphysical properties, and optical properties were taken to obtain high-resolution data sets on aerosol composition in conjunction with black carbon properties and hygroscopicity. Instrumentation included a 7-wavelength Aethalometer, Aerosol Particle Sizer, Aerosol Particle Spectrometer with Depolarization, Condensation Cloud Nucleus counter, Differential Mobility Particle Sizer, GRIMM dust monitor, Hygroscopicity Tandem Differential Mobility Analyser, Multi Angle Absorption Photometer, PhotoAcoustic Soot Photometer, Single Particle Soot Photometer, and a Soot Photometer Aerosol Mass Spectrometer. In addition, a GRIMM dust monitor, a Wide Issue UV Fluorescence Bioaerosol Spectrometer and a Rotating Drum Impactor (RDI) were located on the container’s exterior. RDI samples were subjected to Synchrotron Radiation induced X-Ray Fluorescence Spectrometry analysis to determine trace elemental composition. A compact Time-of-Flight Aerosol Mass Spectrometer (cToF-AMS) was deployed between January and August providing long-term measurements of aerosol chemical composition.
Preliminary data from both ClearfLo IOPs along with data from the long-term cToF-AMS measurements will be presented highlighting diurnal and seasonal characteristics of London urban background pollution. These data will be used to quantify the contribution by different urban activities in London to both local and regional air pollution.