Publication Date:
2019-10-12
Description:
Vertical column density (VCD) of nitrogen dioxide was measured using Pandora spectrometers at six sites on the Korean Peninsula during the Megacity Air Pollution Studies-Seoul (MAPS-Seoul) campaign from May to June 2015. To estimate the tropospheric nitrogen dioxide VCD, the stratospheric nitrogen dioxide VCD from the Ozone Monitoring Instrument (OMI) was subtracted from the total nitrogen dioxide VCD from Pandora. European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis wind data was used to analyze variations in tropospheric nitrogen dioxide VCD caused by wind patterns at each site. The Yonsei/SEO site was found to have the largest tropospheric nitrogen dioxide VCD (1.49 DU on average) from a statistical analysis of hourly tropospheric nitrogen dioxide VCD measurements. At rural sites, remarkably low nitrogen dioxide VCDs were observed. However, a wind field analysis showed that trans-boundary transport and emissions from domestic sources lead to an increase in tropospheric nitrogen dioxide VCD at NIER/BYI and KMA/AMY, respectively. At urban sites, high nitrogen dioxide VCD values were observed under conditions of low wind speed, which were influenced by local urban emissions. Tropospheric nitrogen dioxide VCD at HUFS/Yongin increases under conditions of significant transport from urban area of Seoul according to a correlation analysis that considers the transport time lag. Significant diurnal variations were found at urban sites during the MAPS Seoul campaign, but not at rural sites, indicating that it is associated with diurnal patterns of nitrogen dioxide emissions from dense traffic.
Keywords:
Environment Pollution
Type:
GSFC-E-DAA-TN54413
,
Aerosol and Air Quality Research (ISSN 1680-8584) (e-ISSN 2071-1409); 18; 7; 2207-2219
Format:
application/pdf
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