Aircraft-based measurements of composition and chemical revolution of Organic matter on the large point sources in Korea.

Organic matter (OM) accounts for a large proportion of submicron particle. OM is emitted directly from all parts using fossil fuels and is also produced secondary by precursors. Thermal power plants and petrochemical facility are concentrated in the west coast within 150km near the Seoul Metropolitan Area (SMA). Organic pollutants emitted from large point sources may be inflowed into SMA by westerly winds. Both power plants and petrochemical facility use fossil fuels to produce energy and petrochemical products. Because power plants use coal as the main raw material and petrochemical facility use petroleum as the main raw material, the emission characteristics of the two types of large point sources are different. In addition, the level of treatment of air pollutants emitted by the treatment facilities of the emission facilities is also different depending on level of pollutants treatment system. Identification of emission characteristics of air pollutants by large point sources is necessary for air quality management.

We are conducting aircraft measurement to identify air pollutant emission characteristics of large point sources located in the western part of the Korean peninsula during spring and fall of 2019. And the HR-ToF-AMS, PTR-ToF-AMS, CIMS, gas monitors (NO2, CO, O3, NH3) were installed to Beechcraft 1900D for aircraft measurement.

The scientific goal of this study is to understand of characterize OM on the point sources. We will be presented the oxidation state and chemical composition ratio of OM emitted from large point sources and characteristics of each point source will identified. In addition, changing of oxidation state as OM diffuses from the point source will be analyzed.

Acknowledgment: This research was supported by the National Institute of Environmental Research (NIER) and National Strategic Project-Fine Particle of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MSIT), the Ministry of Environment (ME), and the Ministry of Health and Welfare (MOHW) (2017M3D8A1092015), Korea.