• Title, Summary, Keyword: Atmospheric pollutants concentration

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A Study on the Diffusion of Atmospheric Pollutants over Taegu (대구상공에서의 대기 오염 물질 확산에 관한 연구)

  • Yun, Il-Hui;Min, Gyeong-Deok;Park, Dong-Jae
    • Journal of Environmental Science International
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    • v.3 no.3
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    • pp.241-252
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    • 1994
  • Meteorological parameters In the atmospheric boundary layer and the vertical and horizontal dispersion parameters were determined by analyzing the data obtained by the special upper-air observations of one clear day for each season from October 1991 to August 1992. The concentration of the aklospheric pollutants over Taegu was analyzed by using the application of the Gaussian diffusion model. In the diurnal variation of diffusion of atmospheric pollutants, vertical diffusion due to turbulence is active in daytime while horizontal diffusion due to wind is active in nighttime. The mean concentration of pollutants in the side of downwind is higher during the daytime than the nighttime. Thus, the height of the mixed-layer at the nighttime considered as the most important parameter of the mean concentration of pollutants. In the seasonal variation of diffusion of atmospheric pollutants, vertical diffusion due to strong solar radiation is active in summer case day, and horizontal diffusion due to strong wind is active in winter case day. In winter case day, the mean concentration of pollutants in the side of downwind is maximum in the daytime. However, in summer case day, that is maximum in the nighttime.

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A Study on the Relationship among the Concentration of Reacting Air Pollutants in Urban Atmosphere (도시 대기중에서 반응성 대기오염물질의 농도변화 상관성에 관한 연구)

  • Lee, Hwa-Woon;Kim, Yoo-Keun;Jang, Eun-Suk
    • Journal of Environmental Science International
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    • v.6 no.4
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    • pp.351-357
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    • 1997
  • In the Atmosphere under the various physical and chemical condition different chemical reactions occur and there are a number of air pollutants which are generated by photochemical reaction by absorbing solar energy. Therefor various testing simulation was done as foundation work to develop the numerical model for the prediction of concentration of air pollutants. It was shown change of msjor air pollutants concentration In according to variation of photodissociation speed constant, Kl and Initial condition of air pollutants concentration which plays major role In photochemical reaction. The photochemical reaction model which was used In this study Is found to be useful for understanding relationship among the concentration of reacting air pollutants and the prediction of concentration of air pollutants in urban atmosphere.

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Numerical Simulation of Flow Field and Air Pollutatnts Concentration in Kwangyang Bay (광양만권의 유동장 및 대기오염농도예측)

  • 정용현
    • Journal of Environmental Science International
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    • v.9 no.5
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    • pp.397-402
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    • 2000
  • Numerical simulation model using nesting method and considering topographic features was developed to predict atmospheric environments atmospheric flow temperature and diffusion of air pollutants in Kwangyang bay where having complex areas of point sources Korea. In addition developed simulation model was used tracing of spreading range of pollutants when a gas leaks suddenly from Yeo-cheon industrial complex. by comparing the measured and calculated data on atmospheric flow temperature and diffusion of air pollutants the results showed that this model can be well applied and complicated topography affected the diffusion of air pollutants.

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A Study on the Distribution of Air Pollutant Concentration According to Micrometeorological Characteristics (미기상 특성에 따른 대기오염 농도분포에 관한 연구)

  • Kim, Yoo-Keun;Hong, Jung-Hae;Jeon, Byung-Il
    • Journal of Environmental Science International
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    • v.3 no.1
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    • pp.31-38
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    • 1994
  • The diffusion of the pollutants released into atmosphere is dependent on its chemical reaction, topography and micrometeorological characteristics. The purpose of the study is to investigate how much micrometeorological characteristics such as stability, wind speed and mixing height affect the diffusion of the air pollutants. For this purpose, this paper let 1) the basic theory be K-theory, 2) eddy diffusivity and wind speed be dependent on mixing height and stability, and 3) Grout method be used for numeric calculation. The result was 1) the more unstable condition, the higher mixing height and the higher wind speed we, the lower pollutants concentration appears, 2) the most intensive effect on the distribution of the pollutant concentration is the atmospheric stability.

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On the Prediction and Variation of Air Pollutants Concentration in Relation to the Meteorological Condition in Pusan Area (기상조건에 따른 부산지역 대기오염물질 농도변화와 예측에 관한 연구)

  • 정영진;이동인
    • Journal of Korean Society for Atmospheric Environment
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    • v.14 no.3
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    • pp.177-190
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    • 1998
  • The concentrations of air pollutants In large cities such as Pusan area have been increased every year due to the increasing of fuels consumption at factories and by vehicles as well as the gravitation of the population. In addition to the pollution sources, time and spatial variation of air pollutants concentration and meteorological factors have a great influence on the air pollution problem. Especially , its concentration is governed by wind direction, wind speed, precipitation, solar radiation, temperature, humidity and cloud amounts, etc. In this study, we have analyzed various data of meteorological factors using typical patterns of the air pressure to investigate how the concentration of air pollutants is varied with meteorological condition. Using the relationship between meteorological factors (air temperature, relative humidity, wind speed and solar radiation) and the concentration of air pollutants (SO2, O3) , experimental prediction formulas for their concentration were obtained. Therefore, these prediction formulas at each meteorological factor in a pressure pattern may be roughly used to predict the air pollutants concentration and contributed to estimate the variation of its value according to the weather condition in Pusan city.

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Numerical Modeling of Pollutants using Local Wind Model in Gwangyang Bay, Korea (국지순환풍 모델을 이용한 광양만권 대기오염물질의 수치모델링)

  • 이상득
    • Journal of Korean Society for Atmospheric Environment
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    • v.19 no.1
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    • pp.13-23
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    • 2003
  • A local wind model and a three dimensional local environmental model including advection, diffusion, deposition. and photochemical reactions were performed at Gwangyang Bay, Korea, to predict air flow and air pollutants concentrations. A large grid was used, and nesting method was employed for small grid calculation. From the meterological module simulation, we were able to reproduce local wind characteristics such as sea/land winds and mountain/valley winds simulation at Gwangyang Bay. In addition, the concentration module showed high concentration regions at Yosu industrial complex, Gwangyang steel company. and Container anchor. It was also seen that air pollutants were dispersed by sea/land winds. A comparison between the measurement and the prediction of sulfur dioxide and nitric oxide, which are relatively low-reacted pollutants, was performed. However, the measured nitrogen dioxide and ozone concentrations were higher than the simulated ones. Particularly, ozone concentration between 8 a..m. and 8 p.m. agreed well, but the measured ozone during the rest of time were generally higher.

Yearly Variation and Influencing Factors of Ozone Concentration in the Ambient Air of Seoul (서울시 대기중 오존오염도의 연도별 변화와 그 영향인자 분석: 광화문 지역을 중심으로)

  • Lee, Ki-Won;Kwon, Sook-Pyo;Chung, Yong
    • Journal of Korean Society for Atmospheric Environment
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    • v.9 no.1
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    • pp.107-115
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    • 1993
  • This study was carried out to find the characteristics of surface ozone concentration data obtained during 1988-1991 by the Korea Ministry of Environment. Seasonal data (spring, summer, autumn and winter) wre obtained in May, August, November and February respectively at Kwanghwamun in Seoul. The pollutants analyzed in this study are $SO_2, TSP, CO, NO, NO_2 and NO_2/NO$. Atmospheric factors such as solar radiation, wind speed, relative humidity, cloud amount and atmospheric temperature are also analyzed. The influence of pollutants and atmospheric factors that affect ozone concentration were analyzed by statistical method. The results are summarized as follows : 1. The ozone concentration varied seasonally. The maximum values were 23 ppb in spring, 33 ppb in summer, 16 ppb in autumn and 13 ppb in winter. So the seasonal ozone value was highest in Summer. 2. Te diurnal concentration of ozone was highest during 2-4 P. M. and was very low in the morning and evening. 3. The maximal correlation coefficients of each season between ozone concentration and the influencing pollutants or atmospheric factors asr as follows ; a. spring, r = 0.44(solar radiation) b. summer, r = -0.59(relative humidity) c. autumn, r = -0.55(relative humidity) d. winter, r = -0.58($NO_2$) 4. The major factor affecting the ozone concentration in spring was solar radiation, Relative humidity was the first affecting factor in summer, autumn and $NO_2$ concentration was dominant in winter.

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Effect of Green Buffer Zone in Reducing Gaseous Air Pollutants in the Shiwha Industrial Area (시화공단 완충녹지대의 대기오염물질 저감 효과 분석)

  • Song Young-Bae
    • Journal of the Korean Institute of Landscape Architecture
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    • v.33 no.6
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    • pp.90-97
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    • 2006
  • The effects of a green buffer zone to protect a residential area from air pollution from industrial facilities and traffic was examined by analyzing the case of a green buffer zone in the Shiwha industrial complex. The green buffer zone is 175 m wide. The intent was to assess the dispersion patterns of atmospheric air pollutants and the reduction in concentration around the green buffer zone. To measure atmospheric sulfur dioxide$(SO_2)$ and nitrogen dioxide$(NO_2)$ concentration, badge-type passive samplers were used and set up at 76 locations in order to measure the concentration of air pollutants with respect to the spatial dispersion. The weighted mean values of $SO_2\;and\;NO_2$ concentration were $3\~57 ppb\;and\;18\~62 ppb$ and the differences among the green buffer zone, the industrial area and the residential areas were $0.7\~1.1 ppb$. Mean values of atmospheric concentrations of $NO_2$ were similar in industrial and, residential areas and the green buffer zone. Results of the study show that the effect of the green buffer zone on reducing the dispersion of air pollutants was very low. This study also recommends that micro-climate, i.e., wind direction should be considered as a factor for planning and design of green buffer zones.

The Prediction and Evaluation Air Pollutants Concentration around Industrial Complex by using Atmospheric Dispersion Models -Based on ISCST3, FDM, AERMOD- (대기확산모델을 사용한 공단주변지역의 대기오염물질농도 예측 및 평가 -ISCST3, FDM, AERMOD를 중심으로-)

  • 이화운;원경미;배성정
    • Journal of Environmental Science International
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    • v.8 no.4
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    • pp.485-490
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    • 1999
  • We will calculate concentration of air pollutants using ISCST3, FDM and AERMOD of models recommended in U. S. EPA which are able to predict concentration of short term for point source, complex like industrial complex, power plant and burn-up institution. Before executing model, as analyzing computational result of many cases according to selecting of input data, we will increasing predictable ability of model in limit range of model. Especially, we analyzed three cases-case of considering various emission rate according to time scale and not, case considering effect of atmospheric pollution materials removed by physical process. In our study, after comparing and analyzing results of three model, we choose the atmospheric dispersion model reflected well the characteristic of the area. And we will investigate how large the complex pollutant sources such as industrial complex contribute to atmospheric environment and air quality of the surrounding the area as predicting and estimating chosen model.

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Evaluation of Acid Rain through the Scavenging Theory and Application of Trajectory Model (세정이론을 통한 산성비의 평가와 발원지 추적)

  • Kim, Jeong-Soo;Kang, In-Goo;Chang, Sung-Kee
    • Journal of Korean Society for Atmospheric Environment
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    • v.8 no.2
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    • pp.121-127
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    • 1992
  • This study was carried out to investigate the features of air pollutants in rainwater and trace their transported trajectories from other countries. Chemical analysis data of rainwater and suspended particulates collected at Seoul, Kanghwa, and Taean for three years were used to evaluate the effects of long-range transport of air pollutants. Scavenging theory on washout and rainout effect during a rainy period was applied to estimate whether pollutants in the precipitation were long-range transported or not. On the other hand, precipitation weighted surface wind were evaluated to analyze the effect from local sources on atmospheric concentrations. As a result, contribution of air pollutants caused by anthropogenic sources in the precipitation which was identified to be long range transported was confirmed significantly high and trajectory of these pollutants was to be equivalent to 850mb isobar. Although concentration of acidifying components increased in the precipitation, neutralization by alkaline soil components such as $Ca^{2+}$ and $Mg^{2+}$ was conspicuous especially during Yellow-sand period.

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