10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Chemical and Optical Characteristics of PM2.5 at an Urban Site in Gwangju during Spring 2016
JIHYO CHONG, Kwangyul Lee, Tsatsral Batmunkh, Hee-Joo Cho, Hungsoo Joo, Min-Suk Bae, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 431 Working Group: Aerosol Chemistry
Abstract Integrated aerosol (PM2.5) measurements such as mass concentration and chemical compositions together with the aerosol optical properties were conducted at an urban site of Gwanjgu from March to April, 2016. Filter samples were collected daily to determine the water-soluble inorganic ions (sulfate, nitrate, chloride, ammonium, sodium, potassium, calcium and magnesium), organic carbon (OC) and elemental carbon (EC) in PM2.5. OC and EC concentrations were measured using a Sunset OC/EC analyzer (model 3F; Sunset Laboratory Inc., Tigard, OR, USA). The mass concentration of PM2.5 ranged from 0.40 to 129.40 μg/m3 with the average value of 29.88±20.19 μg/m3. The major ions were NO3-, SO42- and NH4+, contributing 40.0%, 31.8% and 22.6% to the total PM2.5 mass. The high NO3-/SO42- ratio suggested that vehicular exhaust made an important contribution to atmospheric pollution. Average OC and EC concentrations were 7.33 μgC/m3 and 0.87 μgC/m3, taking possession of 18.4% and 2.2% of the PM2.5 mass, respectively. In addition, the black carbon (BC) and total mass concentrations of particulate matter less than 2.5 μm (PM2.5) were measured at Gwangju Institute of Science and Technology (GIST) measurement site to examine the relationship between the chemical compositions and optical characteristics of particles. Particulate matter (PM) events were defined depending on the mass concentration of PM (< 2.5 μm), air mass backward-trajectory, that was calculated using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model (Draxler and Rolph, 2013). In addition, aerosol optical properties including aerosol optical depth (AOD) were measured using a sunphotometer (Holben et al., 1998) and AODs were retrieved from MODIS Terra satellite products (Li et al., 2007; Ruiz-Arias et al., 2013).