AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
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Elevated Number and Mass Concentrations of Fine Particles during Winter in 2018 and 2019 in Urban Gwangju, Korea
JIHO JANG, Haebum Lee, Nohhyeon Kwak, Minhan Park, Jihyo Chong, Ma. Cristine Faye Denna, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 388 Working Group: Urban Aerosols
Abstract Fine (<2.5 μm) and ultrafine (<100 nm) particles are of current interest due to their effects on radiation balance, cloud formation, and human health (Takami et al., 2005). It is important to understand source and formation pathways for fine and ultrafine particles elevated in urban ambient atmosphere (Song et al., 2010; Wagstrom and Pandis, 2011). An intensive measurement was conducted during the winter of 2018 (1/3-2/2) and 2019 (12/27-01/25) at urban Gwangju, Korea (35.23° N, 126.84° E). Particle number concentrations of fine and ultrafine particles were measured with a scanning mobility particle sizer (SMPS) which includes differential mobility analyzer (DMA) (3085, TSI, USA) and condensation particle counter (CPC) (3022, TSI. USA), and an optical particle counter (OPC) (1.108, Grimm, USA). The mass concentration of black carbon (BC) and particulate matter (<2.5 μm) were measured with an aethalometer (AE-31, Magee, USA), and OPC, respectively. Average number concentrations (particles/cm3) of particles in size ranges of 20-100 nm, 20-700 nm, and 0.3-2.5 μm were 2355 (±1452), 4038 (±2085), and 159 (±131), respectively. Average mass concentrations (μg/m3) of PM2.5 and BC were 10.96 (±3.85) and 1.19 (±0.83), respectively. Twelve new particle formation (NPF) events (elevated number concentration of ultrafine particles (<100 nm) with subsequent growth) and seven PM2.5 event days (elevated PM2.5 mass concentration) were observed. It was found that NPF event days were not identical with the PM2.5 event days. Various characteristics of NPF and PM2.5 concentration events at urban Gwangju are being investigated.