Abstract View
Shipborne Measurements of Fine Particles over the Yellow Sea during Spring (2015-2018)
NOHHYEON KWAK, Hyunok Maeng, Seojong Kim, Kwangyul Lee, Arom Seo, Jihyo Chong, Jo Wan Cha, Sang-bum Ryoo, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 348
Working Group: Remote and Regional Atmospheric Aerosol
Abstract
Atmospheric environment over the Yellow Sea located between China and Korea was often affected by the continental air masses transported from the two countries. In this study, shipborne measurements were carried out on board the GISANG 1 (Research Vessel of the Korea Meteorological Administration) every spring from 2015 to 2018 to examine chemical and physical characteristics of fine particles over the Yellow Sea. For chemical composition, ionic species (NH4+, Na+, K+, Mg2+, Ca2+, Cl-, NO3- and SO42-), elements (Mg, Al, V, Cr, Mn, Co, Ni, Cu, Zn, As, Se, Sr, Cd, Ba and Pb), organic carbon (OC) and elemental carbon (EC) were analyzed. Transmission electron microscopy/energy dispersive spectroscopy (TEM/EDS) was used to look into the morphology and elements of fine particles. Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model of National Oceanic and Atmospheric Administration (NOAA) was applied to investigate the origins and pathways of air masses arriving at the sampling location. During shipborne measurement in 2018, the percentage of air masses that passed the Sea, China and Korea were 53.3%, 25.5% and 9.2%, respectively. Averaged mass concentration of PM2.5 was 18.6 ± 10.6 μg /m3. Three high PM2.5 episodes were identified, having concentrations over 25 μg/m3. The highest concentration of 32.1 μg/m3 was observed on May 24 possibly related to long-range transported dust. During the high PM2.5 episodes, higher fraction of Al, Sr, Zn, Ba and Cd, and lower fraction of Na+, Cl-, NO3-, SO42-, Mn, Co, Ni and Cu in PM2.5 were observed relative to non-event periods. Further discussion on morphology and chemical data of PM2.5 will be presented.