AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Sources of Black Carbon Particles at a Rural Site Southeast of London, UK during ClearfLo (Winter 2012)
LEAH WILLIAMS, Scott Herndon, John Jayne, Andrew Freedman, William Brooks, Jonathan Franklin, Paola Massoli, Edward Fortner, Puneet Chhabra, Mark Zahniser, Timothy Onasch, Manjula Canagaratna, Douglas Worsnop, Nga Lee Ng, Lu Xu, Berk Knighton, Manvendra Dubey, Allison Aiken, Kyle Gorkowski, Shang Liu, Dominique Young, Dantong Liu, James Allan, Aerodyne Research, Inc.
Abstract Number: 352 Working Group: Aerosol Chemistry
Abstract We deployed a suite of instruments at a rural site approximately 65 km southeast of London in Detling, UK during January-February, 2012, as part of the Clean Air for London (CleafLo) campaign. Measurements included aerosol chemistry and optical properties, gas-phase tracers, secondary organic aerosol (SOA) precursors, and radiative and meteorological conditions. This talk will focus on black carbon containing particles measured at Detling. The soot particle aerosol mass spectrometer (SP-AMS) instrument made in situ measurements of the chemical composition and size distributions of black carbon containing particles, including both the black carbon component and any coatings. The mass spectra were analysed with positive matrix factorization (PMF) yielding three factors. The first factor has dominant peaks at m/z 60 and 72, indicative of solid fuel burning. The second factor has a mass spectrum suggesting hydrocarbons associated with fresh vehicle emissions, while the third factor has a mass spectrum associated with oxygenated organics and more aged aerosol particles. The PMF factors are linked to air mass sources using dispersion model back trajectories and local wind measurements. Connections between the chemical, microphysical, and optical properties of the black carbon containing particles in the different air masses will be presented. Comparison with similar measurements in central London will also be presented.