Editorial Type:
Article
Article Type:
Research Article

Temporal and Spatial Variations of NOx and Ozone Concentrations in Seoul during the Solar Eclipse of 22 July 2009

Kyung-Hwan Kwak School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea

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Young-Hee Ryu School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea

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Jong-Jin Baik School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea

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Print Publication:
01 Mar 2011
DOI:
https://doi.org/10.1175/2010JAMC2561.1
Page(s):
500–506
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Abstract

The temporal and spatial variations of NO, NO2, and O3 concentrations in Seoul, South Korea, during the solar eclipse of 22 July 2009 are investigated by analyzing data measured at 25 environmental monitoring stations. The NO2 concentration increases and the NO and O3 concentrations decrease because the efficiency of NO2 photolysis decreases during the solar eclipse. About an hour after the maximum obscuration, the reduction in the average O3 concentration over Seoul is estimated to be 45%. The maximum reduction in the O3 concentration downwind of the NOx source area is higher and occurs later than that in the downtown region. Deviations from the NO–NO2–O3 photostationary state in the downwind region are larger than those in the downtown region. This result implies that, in addition to the photochemical effect, the effect of transport by winds increases the reduction potential of the O3 concentration in the downwind region during the solar eclipse.

Corresponding author address: Jong-Jin Baik, School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, South Korea. Email: jjbaik@snu.ac.kr

Abstract

The temporal and spatial variations of NO, NO2, and O3 concentrations in Seoul, South Korea, during the solar eclipse of 22 July 2009 are investigated by analyzing data measured at 25 environmental monitoring stations. The NO2 concentration increases and the NO and O3 concentrations decrease because the efficiency of NO2 photolysis decreases during the solar eclipse. About an hour after the maximum obscuration, the reduction in the average O3 concentration over Seoul is estimated to be 45%. The maximum reduction in the O3 concentration downwind of the NOx source area is higher and occurs later than that in the downtown region. Deviations from the NO–NO2–O3 photostationary state in the downwind region are larger than those in the downtown region. This result implies that, in addition to the photochemical effect, the effect of transport by winds increases the reduction potential of the O3 concentration in the downwind region during the solar eclipse.

Corresponding author address: Jong-Jin Baik, School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, South Korea. Email: jjbaik@snu.ac.kr

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Journal of Applied Meteorology and Climatology

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