HR: 1340h
AN: A13B-1177    [Abstracts]
TI: Study for PM2.5 composition and variations at Ieodo Ocean Research Station, Korea
AU: * Hwang, G
EM: envi97@naver.com
AF: Department of Earth and Environmental Sciences, Korea University, Anam-dong Korea university Asan science building 643, Seoul, 136-713, Korea, Republic of
AU: Lee, M
EM: meehye@korea.ac.kr
AF: Department of Earth and Environmental Sciences, Korea University, Anam-dong Korea university Asan science building 643, Seoul, 136-713, Korea, Republic of
AU: Shin, B
EM: nikebagf@metri.re.kr
AF: Department of Earth and Environmental Sciences, Korea University, Anam-dong Korea university Asan science building 643, Seoul, 136-713, Korea, Republic of
AU: Lee, J
AF: Korea Ocean Research & Development Institute, Gyeonggi-do Ansan sangrok-gu Heaanro 454, Ansan, 426-744, Korea, Republic of
AU: Sim, J
AF: Korea Ocean Research & Development Institute, Gyeonggi-do Ansan sangrok-gu Heaanro 454, Ansan, 426-744, Korea, Republic of
AU: Lee, G
AF: Department of Environmental Science, Hankuk university of Foreign Study, Gyeonggi-do Yuongin Cherin-gu Mohyeon, Yuongin, 449-791, Korea, Republic of
AB: PM_2.5 has been collected since June 2004 at Ieodo Ocean Research Station (IORS), which is located in the middle of China and South Korea. For 3 years from June 2004 to June 2007, average mass concentrations were 20.97±16.86 μg/m³ and concentrations were the highest in spring (29.32μg/m³) and lowest in summer (17.00μg/m³). Water soluble ions were determined during December 2004 to September 2005. SO₄^2- (32.2%) and NH₄⁺ (14.2%) were the most abundant species. In winter, SO₄^2- accounted for 42% of PM_2.5 means, which was higher than that in spring (26%). Nitrate was thought to be lost through evaporation. The cluster analysis of backward trajectories for 5 days was performed to examine the possible aerosol sources. High mass concentrations were observed in air masses originating from China inland (26.93μg/m³). Also, the seasonal PM_2.5 mass concentrations were well correlated with the frequency of western wind. Compared with PM_2.5 measurements at Gosan during the ABC- EAREX2005 (March 2005), PM_2.5 mass and major ionic concentrations were higher at IORS while the variation pattern was similar in two stations. These results implied that PM_2.5 mass and its major ionic species at IROS were greatly influenced by outflows from China.
UR: http://atmos.korea.ac.kr
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0335 Ion chemistry of the atmosphere (2419, 2427)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting