Journal of the Optical Society of Korea

  • 제15권1호
  • /
  • Pages.96-102
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  • 2011
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  • 1226-4776(pISSN)
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  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
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Derivation of the Ambient Nitrogen Dioxide Mixing Ratio over a Traffic Road Site Based on Simultaneous Measurements Using a Ground-based UV Scanning Spectrograph

  • Lee, Han-Lim (Department of Atmospheric Sciences, Yonsei University) ;
  • Noh, Young-Min (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Ryu, Jae-Yong (Radiation Research Division for Industry & Environment, Korea Atomic Energy Research Institute (KAERI)) ;
  • Hwang, Jung-Bae (School of Electronics and Computer Engineering, Chonnam National University) ;
  • Won, Yong-Gwan (School of Electronics and Computer Engineering, Chonnam National University)
  • 투고 : 2010.11.01
  • 심사 : 2011.01.10
  • 발행 : 2011.03.25
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초록

Simultaneous measurements using a scanning spectrograph system and transmissometer were performed for the first time over an urban site in Gwangju, Korea, to derive the ambient $NO_2$ volume mixing ratio. The differential slant column densities retrieved from the scanning spectrograph system were converted to volume mixing ratios using the light traveling distance along the scanning line of sight derived from the transmissometer light extinction coefficients. To assess the performance of this system, we compared the derived $NO_2$ volume mixing ratios with those measured by an in situ chemiluminescence monitor under various atmospheric conditions. For a cloudless atmosphere, the linear correlation coefficient (R) between the two data sets (i.e., data derived from the scanning spectrograph and from the in situ monitor) was 0.81; the value for a cloudy atmosphere was 0.69. The two sets of $NO_2$ volume mixing ratios were also compared for various wind speeds. We also consider the measurement errors, as estimated from an error propagation analysis.

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