Nitrogen dioxide (NO2) is one of the major air pollutants playing a key role in tropospheric
chemistry and climate change. This study analyzed the long-term trend of daily tropospheric NO2
columns in Thailand from 2007 to 2017 (11 years) retrieved from the SCIAMACHY, GOME-2A,
GOME-2B and OMI satellites. The consistency between the satellites (GOME-2A vs. SCIAMACHY,
GOME-2A vs. GOME-2B and GOME-2A vs. OMI) were investigated during the overlapped time
period. Overall, the results showed a good agreement in seasonal variation. The satellite NO2 data
were also compared with ground data including NO2 concentrations from ground monitoring
stations and meteorological data (temperature, relative humidity and wind speed) over 6 regions
of Thailand (North, Northeast, Central, East, Southwest and Southeast). The comparative analysis
between satellites NO2 columns and ground NO2 concentrations presented well correlated results.
NO2 data from both satellite and ground measurements had maximum levels in the dry season
(November-April) with the peak in March while the minimum levels were mostly observed in
the wet season (May-October). Moreover, NO2 generally presents at high levels when relative
humidity (RH) levels are low.
Keywords
GOME; NO2; OMI; SCIAMACHY; Thailand
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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