기단 역궤적분석에 의한 경주시 대기오염물질의 농도 변화

다국어 초록 (Multilingual Abstract)

Gyeongju, which was the central city of the ancient civilization at Silla Kingdom, has various kinds of stone cultural properties. It is significantly important to preserve historical sources of Korea. However, recent air quality data measured in Gyeongju did not show good air quality level. In order to investigate variation of the concentration of the air pollutants with meteorological condition, an air quality monitoring and an aerosol sampling were conducted during the intensive monitoring period in Gyeongju. Impacts of the meteorological factors on the air pollutants were also analyzed based on the air mass pathway categories using HYSPLIT model and the local wind patterns using MM5 model. The prevailing air mass pathways were classified into four categories as following; category Ⅰ affected by easterly marine aerosols, category Ⅱ affected by northwesterly continental aerosols, category Ⅲ affected by southwesterly continental aerosols, and category Ⅳ affected by northerly continental aerosols. The concentrations of the air quality standards were relatively lower during the fall intensive monitoring period. At that time, the easterly marine air mass pattern was dominated. The seasonal average mass concentration of PM<SUB>10,Opt</SUB>, which optically measured at the monitoring site, was the highest value of 77.6±28.3 ㎍ m?³ during the spring intensive monitoring period but the lowest value of 20.1±5.3 ㎍ m?³ during the fall intensive monitoring period. The concentrations of SO₂ and CO were relatively higher when the air mass came from the northwestern continent or the northern continent. The concentrations of SO₄²? and NO₃? - increased under the northwesterly continental condition. It was estimated that the acidic aerosols were dominated in the atmosphere of Gyeongju when the air mass came from the continental regions.

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