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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society for Atmospheric Environment
Journal Basic Information
Journal DOI :
Korean Society for Atmospheric Environment
Editor in Chief :
Volume & Issues
Volume 25, Issue 6 - Dec 2009
Volume 25, Issue 5 - Oct 2009
Volume 25, Issue 4 - Aug 2009
Volume 25, Issue 3 - Jun 2009
Volume 25, Issue 2 - Apr 2009
Volume 25, Issue 1 - Feb 2009
Selecting the target year
Verification of Mobile Emission for CMAQ using an Observation-based Approach in Seoul Metropolitan Area
Lee, Yong-Mi ; Lee, Hyun-Ju ; Yoo, Chul ; Song, Jeong-Hui ; Kim, Ji-Young ; Hong, Ji-Hyung ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 369~381
DOI : 10.5572/KOSAE.2009.25.5.369
The objective of this study was to simulate surface air pollutants and to examine reliability of mobile emission for CMAQ system using an observation-based approach in the Seoul Metropolitan Area. Accurate assessment of emissions from mobile source is one of the most debatable parts in the entire emissions inventory process. For this study, we evaluated the official emission inventories of Volatile Organic Compounds (VOCs) and nitrogen oxides (
) using an observation-based approach. In this paper, we achieved VOCs/CO and
/CO ratios derived from ambient measurements taken from June to August of 2005 in early morning (07:00~08:00). And we compared them with those derived from the emission inventory. Based on these ratios and on the assumption that official inventory of CO emissions is reasonably accurate, mobile emissions of
seem to be slightly overestimated and VOCs emissions significantly underestimated. The results of simulations using modified emission of mobile source were in closer agreement with the observation results except NO. Predicted NO values based on revised
emissions were considerably lower than the observed values. Using modified emission inventories brings the modeled values into closer agreement with observed ozone levels in Seoul. Especially in case of CO,
and VOCs emission, the modified values were suitable for simulating ozone levels in Seoul and Gyeonggi. However, ozone values predicted using the modified emissions were higher than the observed and predicted values based on original emissions. According to the 95 percentile ozone concentrations, emission revised by CO,
and VOCs from mobile source was the best for predicting high concentration.
Occurrence of Phthalates in Indoor Dust from Children's Facilities and Apartments in Seoul
Kim, Ho-Hyun ; Lim, Young-Wook ; Yang, Ji-Yeon ; Shin, Dong-Chun ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 382~391
DOI : 10.5572/KOSAE.2009.25.5.382
The aim of the study was to assess the levels in typical central borough of phthalate exposure by monitoring children's facilities (19 kindergartens and 21 elementary schools) and households (17 old apartments and 22 new apartments) via sampling indoor floor dust. A vacuum cleaner specifically prepared for sampling dust was attached to a filter of a vacuum cleaner dust collecting container. During the sample preparation process, containers made of glass were used and analysis was performed using GC-MSD. The mean concentration of DEHP was
, DnBP was
, and BBzP was
dust. The indoor characteristics including floor, wall materials, years after construction, water leakage history for the past three years, and ventilation were also examined to categorize phthalate esters from the dust samples. From the flooring and wallpaper materials of kindergartens and elementary schools, DEHP in the dust sample appeared at a statistically significant level (p<0.05) when PVC materials were present. DEHP in the indoor dust also increased significantly (p<0.01) during the construction period. The daily intake of DEHP measured from indoor dust was 0.08~
for children and 0.02~
for adults (women). The results clearly revealed that phthalate exposure is greater in children than in adults (women) due to the indoor dust.
Measurement of Optical Properties of Ice-crystal Cloud using LIDAR System and Retrieval of Its Radiative Forcing by Radiative Transfer Model
Noh, Young-Min ; Shin, Dong-Ho ; Lee, Kyung-Hwa ; Muller, Detlef ; Kim, Young-J. ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 392~401
DOI : 10.5572/KOSAE.2009.25.5.392
Ice-crystal clouds observation was conducted using a GIST/ADEMRC Multi-wavelength Raman lidar system in order to measure vertical profile and optical depth at Gwangju (
53'E), Korea in December 2002, and March and April 2003. Ice-crystal clouds at high altitude can be distinguished from atmospheric aerosols by high depolarization ratio and high altitude. Ice-crystal clouds were observed at 5~12 km altitudes with a high depolarization ratio from 0.2 to 0.5. Optical depth of ice-crystal clouds had varied from 0.14 to 1.81. The radiative effect of observed ice-crystal cloud on climate system was estimated to be negative net flux in short wavelength (0.25~
) and positive net flux in short+long wavelength (0.25~
) at top of the atmosphere. Net flux by ice-crys tal cloud per unit optical depth was comparable to that of Asian dust.
Removal Effect of Acid Gases by Reactant Mixer and Distributor of Bag Filter in Dry Scrubbing with NaHCO
Lee, Young-Man ; Kwak, Yeon-Ho ; Bae, Woo-Keun ; Kwon, Ki-Wook ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 402~409
DOI : 10.5572/KOSAE.2009.25.5.402
Sodium bicarbonate (
) was used as a reactant for the removal of acid gases from a waste incinerator. The removal efficiencies of HCl and
were tested with a reactant mixing apparatus and a distributor installed at the bag filter inlet. It was shown that the stoichiometric ratio of
to the acid gases which allows a removal of over 90% for both HCl and
was about 1.2. When a reactant mixing apparatus was installed on the duct, the removal efficiencies of HCl and
at the end of the duct were increased by approximately 1.5 and 3 times respectively, compared to when the apparatus was not installed. At the end of the bag filter, the removal efficiencies of the both were as high as 98% with a stoichiometric ratio of 1.35. Installing a reactant mixing apparatus on the duct and a distributor at the entrance of the bag filter and using
as a reactant helped overcome the problem of low removal efficiencies of acid gases by dry scrubbing.
A Study on the Comparison of Emission Factor Method and CEMS (Continuous Emission Monitoring System)
Jang, Kee-Won ; Lee, Ju-Hyoung ; Jung, Sung-Woon ; Kang, Kyoung-Hee ; Hong, Ji-Hyung ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 410~419
DOI : 10.5572/KOSAE.2009.25.5.410
Generally, air pollutant emission at workplace is estimated by two methods: indirect methods using emission factors and direct methods based on CEMS (Continuous Emission Monitoring System). CAPSS (Clean Air Policy Support System) is a representative indirect method and the national air pollutant database of Korea. However, characteristics of some workplaces may create a gap between CAPSS and CEMS data. For improving of emission data accuracy, emission data of CEMS (named CleanSYS) equipped at 138 target workplaces were compared with those of CAPSS. As a result,
emission levels obtained by CAPSS were lower than those of CleanSYS.
emission ratios were 61.5% and 71.2% lower respectively, showing the biggest gaps. On the other hand,
emission of CAPSS was higher by 10.4%.
showed the biggest difference in 'Energy industry combustion' and
did in 'Production Process' within the SCC category.
presented a large gap in 'Manufacturing industry combustion.' The differences in
between the two systems occurred because some large-size facilities lack pollution controllers or efficient pollution controllers. Based on this study, CAPSS emission database of Korea will improve accuracy through adopting CEMS emission system, which enables more efficient national atmospheric policies and workplace management.
Analysis of Organic Compounds in Ambient PM
over Seoul using Thermal Desorption-comprehensive Two Dimensional Gas Chromatography-time of Flight Mass Spectrometry (TD-GCxGC-TOFMS)
Lee, Ji-Yi ; Lane, Douglas A. ; Huh, Jong-Bae ; Yi, Sung-Muk ; Kim, Yong-Pyo ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 420~431
DOI : 10.5572/KOSAE.2009.25.5.420
Characteristics and advantages of the thermal desorption-comprehensive two dimensional gas chromatography-time of flight mass spectrometry (TD-GCxGC-TOFMS) were discussed and the organic compound's analysis result was shown for the ambient
sample collected in Seoul, Korea. Over 10,000 individual organic compounds were separated from about
of aerosols in a single procedure with no sample pre-treatment. Among them, around 300 compounds were identified and classified based on the mass fragmentation patterns and GCxGC retention times. Several aliphatic compounds groups such as alkanes, alkenes, cycloalkanes, alkanoic acids, and alkan-2-ones were identified as well as 72 PAH compounds including alkyl substituted compounds and 8 hopanes. In Seoul aerosol, numerous oxidized aromatic compounds including major components of secondary organic aerosols were observed. The inventory of organic compounds in
of Seoul, Korea suggested that organic aerosol were constituted by the compounds of primary source emission as well as the formation of secondary organic aerosols.
The Application of High-resolution Land Cover and Its Effects on Near-surface Meteorological Fields in Two Different Coastal Areas
Jeong, Ju-Hee ; Kim, Yoo-Keun ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 432~449
DOI : 10.5572/KOSAE.2009.25.5.432
In this study, the effects of high-resolution land cover on the simulation of near-surface meteorological fields were evaluated in two different coastal regions using Weather Research and Forecasting (WRF) model. These analyses were performed using the middle classification land cover data upgraded by the Korean Ministry of Environment (KME). For the purpose of this study, two coastal areas were selected as follows: (1) the southwestern coastal (SWC) region characterized by complex shoreline and (2) the eastern coastal (EC) region described a high mountain and a simple coastline. The result showed that the application of high-resolution land cover were found to be notably distinguished between the SWC and EC regions. The land cover improvement has contributed to generate the realistic complex coastline and the distribution of small islands in the SWC region and the expansion of urban and built-up land along the sea front in the EC region, respectively. The model study indicated that the improvement of land cover caused a temperature change on wide areas of inland and nearby sea for the SWC region, and narrow areas along the coastal line for the EC region. These temperature variations in the two regions resulted in a decrease and an increase in land-breeze and sea-breeze intensity, respectively (especially the SWC region). Interestingly, the improvement of land cover can contribute large enough to change wind distributions over the sea in coastal areas.
Retrieval of Lidar Overlap Factor using Raman Lidar System
Noh, Young-M. ; Muller, Detlef ; Shin, Dong-Ho ; Lee, Kyung-Hwa ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 450~458
DOI : 10.5572/KOSAE.2009.25.5.450
The range-dependent overlap factor of a lidar system can be determined experimentally if a Raman backscatter signal by molecule is measured in addition to the usually observed elastic backscatter signal, which consists of a molecular component and a particle component. The direct determination of the overlap profile is presented and applied to a lidar measurement according to variation of telescope field-of-view and distance between telescope and transmitting laser. The retrieval of extinction coefficient by Raman method can generate high errors for heights below planetary boundary layer if the overlap effect is ignored. The overlap correction method presented here has been successfully applied to experimental data obtained in Gwangju, Korea.
The Analysis of PM
Concentration and the Evaluation of Influences by Meteorological Factors in Ambient Air of Daegu Area
Hwang, Yoon-Jung ; Lee, Soon-Jin ; Do, Hwa-Seok ; Lee, Yun-Ki ; Son, Tae-Jung ; Kwon, Taek-Gyu ; Han, Jung-Wook ; Kang, Dong-Hun ; Kim, Jong-Woo ;
Journal of Korean Society for Atmospheric Environment, volume 25, issue 5, 2009, Pages 459~471
DOI : 10.5572/KOSAE.2009.25.5.459
Air Monitoring Network(11 urban stations) is operated to measure ambient air quality in Daegu city. The urban air monitoring stations include 6 in residence area, 3 in industrial area, 1 in commercial area, and 1 in green area. In this study, hourly data (2006. 1. 1~2008. 12. 31) of
were measured at 11 urban air monitoring stations.
mean concentrations were high in fall and winter because of low wind speed and many haze days. The number of exceeding the daily standard of
in industrial area was approximately twice as many as that in residence area.
concentrations and visibility were influenced significantly by wind speed. Wind speed and visibility were below 1.8 m/s and 10 km, respectively when
concentrations were over
concentrations were high when haze was observed. The mean concentrations of
, respectively when haze, mist and clear were observed.