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KMID : 1024519990080020171
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Journal of the Environmental Sciences
1999 Volume.8 No. 2 p.171 ~ p.176
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Residence Times and Chemical Composition of Atmospheric Aerosols II. Residence Times of Aerosols in Pusan
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Yang Han-Soeb
Jun Eun-Joo
Kim Young-Ill
Ok Gon
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Abstract
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To estimate the residence times of aerosols in air, the activities of and in aerosols were measured at 4 sites in Pusan. All aerosol samples were collected by a high volume air sampler from January to October 1996. The activities and in Pusan were varied from 11.77 to 67.57 dpm/1000 and from 2.63 to 15.91 dpm/1000, respectively. The mean activities were 34.62 dpm/1000 for and 8.24 dpm/1000 for . The highest values of the activities of and were appeared at P3 site and the lowest values at P4 site. During the sampling period, the trends of the activities of and were similar to total suspended particulate matter(TSP) concentrations. The mean residence times of atmospheric aerosols calculated from / activity ratio was about 60~80 days in Pusan. The longest residence time of atmospheric aerosols was in January because of the lack of rainout and washout, but the shortest residence time was in August, largely due to scavenging effect by frequent rains. The activities of and in atmospheric aerosols were different in time and space, which seems that the distribution of and activities and scavenging processes in air may be controlled by the local and meteorological conditions.
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KEYWORD
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aerosols, 210Pb, 210Po, residence times, local and meteorological conditions
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