Abstract
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<sub>2</sub> 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<sub>2</sub> 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<sub>2</sub> volume
mixing ratios were also compared for various wind speeds. We also consider the
measurement errors, as estimated from an error propagation analysis.
© 2011 Optical Society of Korea
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