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Estimation of Atmospheric Deposition Velocities and Fluxes from Weather and Ambient Pollutant Concentration Conditions : Part 1 . Application of multi-layer dry deposition model to measurements at north central Florida site
분야 자연과학 > 기타(자연과학)
저자 (Jong Yeon Hwang),(Eric R . Allen)
발행기관 한국환경과학회
간행물정보 ENVIRONMENTAL SCIENCES 2000년, 제4권 제1호, 31~42쪽(총12쪽)
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영문초록
The dry deposition velocities and fluxes of air pollutants such as SO_2(g), O_3(g), HNO_3(g), sub-micron particulates, NO_(3)^-(s), and SO_(4)^2-(s) were estimated according to local meteorological elements in the atmospheric boundary layer. The model used for these calculations was the multiple layer resistance model developed by Hicks et al. The meteorological data were recorded on an hourly basis from July, 1990 to June, 1991 at the Austin Cary forest site, near Gainesville FL. Weekly integrated samples of ambient dry deposition species were collected at the site using triple-filter packs. For the study period, the annual average dry deposition velocities at this site were estimated as 0.87±0.07 ㎝/s for SO_2(g), 0.65±0.11 ㎝/s for O_3(g), 1.20±0.14 ㎝/s for HNO_3(g), 0.0045±0.0006 ㎝/s for sub-micron particulates, and 0.089±0.014 ㎝/s for NO_(3)^-(s) and SO_(4)^2-(s). The trends observed in the daily mean deposition velocities were largely seasonal, indicated by larger deposition velocities for the summer season and smaller deposition velocities for the winter season. The monthly and weekly averaged values for the deposition velocities did not show large differences over the year yet did show a tendency of increased deposition velocities in the summer and decreased values in the winter. The annual mean concentrations of the air pollutants obtained by the triple filter pack every 7 days were 3.63±1.92 ㎍/㎥, for SO_(4)^(2-), 2.00±1.22 ㎍/㎥ for SO_(2), 1.03±0.59 ㎍/㎥ for HNO_(3), and 0.704±0.419 ㎍/㎥ for NO^(3-), respectively. The air pollutant with the largest deposition flux was SO_(2) followed by HNO_(3), SO_(4)^2-(s), and NO_(3)^-(s) in order of their magnitude. The sulfur dioxide and NO_(3)^(-) deposition fluxes were higher in the winter than in the summer, and the nitric acid and sulfate deposition fluxes were high during the spring and summer.
 
 
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