• Title/Summary/Keyword: center in Seoul

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Analysis of Domestic and Foreign Contributions using DDM in CMAQ during Particulate Matter Episode Period of February 2014 in Seoul (2014년 2월 서울의 고농도 미세먼지 기간 중에 CMAQ-DDM을 이용한 국내외 기여도 분석)

  • Kim, Jong-Hee;Choi, Dae-Ryun;Koo, Youn-Seo;Lee, Jae-Bum;Park, Hyun-Ju
    • Journal of Korean Society for Atmospheric Environment
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    • v.32 no.1
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    • pp.82-99
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    • 2016

  • This study was carried out to understand the regional contribution of Particulate Matter (PM) emissions from East Asia ($82^{\circ}{\sim}149^{\circ}E$, $18^{\circ}{\sim}53^{\circ}N$) to Seoul during high concentration period in February 2014. The Community Multi-scale Air Quality (CMAQ) version 5.0.2 with Decoupled Direct Method (DDM) was used to analyze levels of contributions over Seoul. In order to validate model performance of the CMAQ, predicted PM and its chemical species concentrations were compared to observations in China and Seoul. Model predictions could depict the daily and hourly variations of observed PM. The calculated PM concentrations, however, had a tendency of underestimation. The discrepancies are due to uncertainties of meteorological data, emission inventories and CMAQ model itself. The high PM concentration in Seoul was induced by stationary anticyclone over the West Coast of Korea during 24 to 27 February. The DDM in CMAQ was used to analyze the contributions of emissions from East Asia on Seoul during this PM episode. $PM_{10}$ concentration in Seoul is contributed by 39.77%~53.19% from China industrial and urban region, 15.37%~37.10% from South Korea, and 9.03%~18.05% North Korea. These indicate that $PM_{10}$ concentrations in Seoul during the episode period are dominated by long-range transport from China region as well as domestic sources. It was also found that the largest contribution region in China were Shandong peninsula during the PM event period.

  • https://doi.org/10.5572/KOSAE.2016.32.1.082 인용 PDF KSCI

Facile Approach to Magnetic Carbon Nanoparticles using an Iron-Doped Polymer Precursor

  • Yoon, Hyeon-Seok;Jang, Jyong-Sik
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.283-283
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    • 2006

  • Multigram-scale product exclusively containing magnetic carbon nanoparticles (MNCPs) with uniform size was successfully fabricated without a specific separation process. The iron-doped PPy nanoparticles were synthesized by micelle templating and used as the carbon precursor in order to generate MCNPs. The magnetic carbon nanoparticles possessed a microporous structure and exhibited ferromagnetic properties at room temperature. This approach may be an effective alternative to generate magnetic carbon nanoparticles against the conventional arc-discharge technique.

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