Overview of ClearfLo: study of aerosol sources and processing at a rural site southeast of London

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Aerosol Properties


John T Jayne — Aerodyne Research, Inc. Kyle Gorkowski — Los Alamos National Laboratory
Richard L. Coulter — Argonne National Laboratory Scott C Herndon — Aerodyne Research, Inc.
Markus Furger — Paul Scherrer Institute Joel Thornton — University of Washington
Andrew Freedman — Aerodyne Research, Inc. Nga Lee Ng — Georgia Institute of Technology
Manvendra K. Dubey — Los Alamos National Laboratory Felipe Lopez-Hilfiker — University of Washington
Timothy B Onasch — Aerodyne Research, Inc. William Brooks — Aerodyne Research, Inc.
Leah R Williams — Aerodyne Research, Inc. Jonathan P Franklin — Aerodyne Research, Inc.
Puneet Chhabra — Aerodyne Research, Inc.
Allison C Aiken — Los Alamos National Laboratory Mark Stuart Zahniser — Aerodyne Research, Inc.
Ed Fortner — Aerodyne Research, Inc. Harald Stark — Aerodyne Research, Inc.
Paola Massoli — Aerodyne Research, Inc. Claudia Mohr — University of Washington


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 from multiple sites: at a city street site (urban London), a city background site (away from local traffic sources) and at a rural location (outflow from the London urban area). We deployed a suite of instruments at the rural site approximately 50 km southeast of London in Detling, UK, during January–February 2012. Measurements included aerosol chemical, optical and microphysical properties, gas-phase tracers, secondary organic aerosol (SOA) precursors, and radiative and meteorological conditions. During the six-week campaign, we sampled air masses from several distinct sources. Winds from the southwest passed over a large road 200 m from the site and brought air masses characterized by highly variable CO, indicating local sources, high black carbon concentrations, and hydrocarbon-like aerosol chemical composition. When the wind was from the east and northeast, we sampled outflow from the European continent. The gas-phase composition indicated an aged air mass, and particle composition was predominately oxygenated organics, nitrate, and sulfate. Outflow from London was sampled during periods when the wind was from the northwest. In addition to regional air quality, the wintertime study provided information on gas and particle emissions from local home-heating solid fuels. We will present case studies of different particle sources, including a comparison of chemistry and optical properties, as well as comparisons with urban London particulate measurements.

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Shang Liu