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KMID : 1024520080170060633
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Journal of the Environmental Sciences
2008 Volume.17 No. 6 p.633 ~ p.645
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Comparison of PM1, PM2.5, PM10 Concentrations in a Mountainous Coastal City, Gangneung Before and After the Yellow Dust Event in Spring
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Choi Hyo
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Abstract
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In order to investigate the variations and corelation among concentrations, the hourly concentrations of each particle sizes of 300nm to at a city, Gangneung in the eastern mountainous coast of Korean peninsula have been measured by GRIMM aerosol sampler-1107 from March 7 to 17, 2004. Before the influence of the Yellow Dust event from China toward the city, , concentrations near the ground of the city were very low less than , with little variations. Under the partial influence of the dust transport from the China on March 9, they increased to . concentration was 1.5 times higher than and 1.85 times higher than . Ratio of had a maximum value of 1.49 with an averaged 0.5 and one of had a maximum value of 0.4 with an averaged 0.25. concentrations were largely influenced by particles smaller than particle sizes, respectively. During the dust event from the afternoon of March 10 until 1200 LST, March 14, concentrations reached , indicating the concentration being 3.3 times higher than and 5.97 times higher than . Ratio of had a maximum value of 7.82 with an averaged 3.5 and one of , had a maximum value of 2.8 with an averaged 1.5, showing concentrations largely influenced by particles greater than particle sizes, respectively. After the dust event, the most of PM concentrations became below , except of 0900LST, March 15, showing the gradual decrease of their concentrations. Ratio of had a maximum value of 3.75 with an averaged 1.6 and one of had a maximum value of 1.5 with an averaged 0.8, showing the concentration largely influenced by corse particles than and the by fine particles smaller than , respectively. Before the dust event, correlation coefficients between , were 0.89, 0.99 and 0.82, respectively, and during the dust event, the coefficients were 0.71, 0.94 and 0.44. After the dust event, the coefficients were 0.90, 0.99 and 0.85. For whole period, the coefficients were 0.54, 0.95 and 0.28, respectively.
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KEYWORD
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PM1, PM2.5, PM10, The Yellow Dust event, Correlation coefficient
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