Observation of Aqueous Processing of Organic Aerosol Components in Fog Water at Baengnyeong Island, South Korea
Dense fog events are frequently observed during late spring and mid-summer in the Yellow Sea in Southeast Asia, along with high concentrations of particulate and gaseous pollutants. Fog water samples were collected at Baengnyeong Island, South Korea in the summer of 2014 to look for chemical and physical signatures of aqueous oxidation reactions. Chemical concentrations were measured including total organic carbon, organic acids, anions, cations, reduced sulfur, peroxides, acidity and formaldehyde. Photo-oxidation reactions of a model aqSOA precursor were carried out within selected fog water samples. Results of these analyses may include evidence of oxidation reactions leading to the formation of aqSOA within the fog droplets intercepted at Baengyeong Island.