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초록

Based on the tropospheric nitrogen dioxide(NO2) vertical column densities(VCD)
from the Ozone Monitoring Instrument(OMI), we analyzed the distribution of, and
changes in NO2 over East Asia from 2013 to 2017. Over these 5 years, there was a
remarkable decrease in NO2 VCDs over central and eastern China, which suggests a
widespread decrease of NOx emissions from China. The OMI NO2 measurements were
also compared with collocated surface measurements in 5 cities(Seoul, Daejeon, Daegu,
Gwangju, and Busan) over the Korean peninsula. The correlation between OMI and
surface measurements was much more pronounced for monthly averages, compared to
daily averages, implying that the satellite NO2 measurements could be a reliable
indicator for surface NO2 distribution and changes on monthly time-scales. It was also
shown that the use of the mixing layer height, estimated from lidar measurements, can
significantly improve the correlation between OMI and surface measurements by
accounting