Characterization of aerosol composition, concentrations, and sources at Baengnyeong Island, Korea using an aerosol mass spectrometer

摘要: Abstract To improve understanding of the sources and chemical properties particulate pollutants on western side Korean Peninsula, an Aerodyne High Resolution Time Flight Aerosol Mass Spectrometer (HR-ToF-AMS) measured non-refractory fine (PM 1 ) particles from May to November, 2011 at Baengnyeong Island, South Korea. Organic matter sulfate were generally most abundant species exhibited maximum concentrations 36 μg/m 3 39 μg/m , respectively. Nitrate peaked 32 μg/m but typically much lower than organic concentrations. May, September, October, November featured highest monthly average concentrations, with observed June through August. Potential source contribution function (PSCF) analysis individual case studies revealed that transport eastern China, area high SO 2 emissions, was associated measurement site. Observed aerosol sometimes fully neutralized by ammonium often acidic; molar ratio 1.49. Measured size distributions a range particle modes between 100 600 nm. regions widespread, including contributions China Positive matrix factorization (PMF) indicated three “factors,” or types aerosol, comprising one primary, hydrocarbon-like (HOA) two oxidized (OOA) components, more (MO-OOA) less (LO-OOA) aerosol. On average, HOA OOA contributed 21% 79% mass (OM), respectively, MO-OOA fraction nearly times as LO-OOA fraction. Biomass burning OM low during late spring/early summer agricultural season in since airflow into Asian Monsoon prevents emissions eastward Peninsula. Concentrations m/z 60 AMS biomass marker autumn, when patterns appeared bring some smoke fires northern Asia island.