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.