AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Black Carbon Containing 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, Felipe Lopez-Hilfiker, Claudia Mohr, Joel Thornton, Nga Lee Ng, Lu Xu, Berk Knighton, Manvendra Dubey, Allison Aiken, Kyle Gorkowski, Shang Liu, Andre Prévôt, et al., Aerodyne Research, Inc.
Abstract Number: 569 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract Clean Air for London (ClearfLo) is a large, multidisciplinary study of the London urban atmosphere aimed at understanding the relationships between surface meteorology, gas-phase composition and particulate matter at city sites and at rural locations that sample the inflow to or outflow from the London urban area. We deployed a suite of instruments at a rural site approximately 50 km southeast of London in Detling, UK during January-February, 2012. Measurements included aerosol chemistry and microphysics, 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.