Observation of O3, CO, PM2.5, BC and greenhouse gases at the Ocean Research Stations in the Yellow Sea

Ieodo and Socheongcho Ocean Research Station (ORS) were established by Korea Institute of Ocean and Science & Technology (KIOST) for oceanic and atmospheric observation in the Yellow Sea. Ozone and PM2.5 mass concentrations have been continuously monitored at both stations since 2014. In addition, the measurement of CO, black carbon (BC), and greenhouse gases such as CO2, CH4 and H2O were added to Socheongcho. During Jan 2015 Feb 2016, O3 concentration range from 3 ppbv to 66 ppbv and 0 ppbv to 108 ppbv at Socheongcho and Ieodo, respectively. For the two stations, PM2.5 mass concentrations were in the range between 1 and 131 ㎍/㎥ during Sep 2014 Jan 2016. While O3 concentrations were higher in the warm season, PM2.5 concentrations were higher during cold season with more frequent high-concentration episodes over 100 ug/m3. The mean concentrations of CO2 and CH4 were 399.6 ppm and 1.92 ppm, respectively during Jan 2015 Aug 2015, which were lower than those of the two GAW (Global Atmospheric Watch) stations in Korea. While CO and CO2 concentration were higher in winter than summer, CH4 concentrations showed the opposite trend at Socheongcho. The O3 and PM2.5 variations were different in the two stations, depending mainly on the degree of continental influence.