Kim, Jin Young Ghim, Young Sung Song, Chul Han Yoon, Soon-Chang Han, Jin Seok 2024-01-21T01:05:22Z 2024-01-21T01:05:22Z 2021-09-02 2007-04 2169-897X https://pubs.kist.re.kr/handle/201004/134496 The characteristics of air masses arriving at Gosan, Korea, were investigated on the basis of PM2.5 measurements during six intensive measurement periods (IMPs) in order to delineate the influences of various types of seasonal events in northeast Asia. The air masses arrived from the northwest/west along prevailing westerlies during three IMPs performed in the nonsummer seasons. Three characteristic periods of stagnation, Asian dust, and pollution periods were identified in November 2001, spring 2002, and February 2003, respectively. Another three characteristic periods of typhoon, biomass burning, and marine background periods were identified in the summer seasons: late August to early September 2002, June 2003, and August 2003, respectively. Anthropogenic pollution levels increased significantly not only because of stagnant meteorological conditions but also because of transport from high-emission areas with prevailing westerly winds during heating seasons (winter and/or fall). In spring, there was a good contrast between a weak Asian dust (AD) period with dusts transported from the Gobi desert and a strong AD period with dusts transported from Inner Mongolia. During the weak AD period the levels of anthropogenic pollutants were high, whereas during the strong AD period, anthropogenic ion concentrations were significantly low in spite of high mass concentrations. In summer, marine influences were strong either because of transport from the Pacific Ocean or the effects of typhoons. Influences from biomass burning from China and/or Russia were the strongest in June (biomass burning period) but continued in the marine background period. English AMER GEOPHYSICAL UNION Seasonal characteristics of air masses arriving at Gosan, Korea, using fine particle measurements between November 2001 and August 2003 Article 10.1029/2005JD006946 1 The Journal of Geophysical Research: Atmospheres, v.112, no.D7 The Journal of Geophysical Research: Atmospheres 112 D7 N scie scopus 000245579900001 2-s2.0-34250319759 Meteorology & Atmospheric Sciences Meteorology & Atmospheric Sciences Article INDIVIDUAL AEROSOL-PARTICLES ASIAN DUST PARTICLES ACE-ASIA CHEMICAL-CHARACTERIZATION SOUTHERN AFRICA CARBON URBAN PM2.5 IDENTIFICATION LOCATIONS