On the temporal and spatial variability of air pollutants characteristic and origin using ground-based and satellite observations over Seoul
Abstract
We investigated the spatial and temporal characteristics of five major air pollutants collected from 44 air quality stations over Seoul and its surroundings namely, nitrogen dioxide (NO2), carbon monoxide (CO), ozone (O3), particular matter (PM10) and sulfur dioxide (SO2) between 2000 and 2009. The corresponding satellite datasets namely, Aerosol Optical Depth (AOD), Angstrom exponent and Fine Mode Fraction (FMF), collected from MODIS have been analyzed as well. Moreover, AERONET data were used for verifying MODIS retrievals and the two datasets matched highly with correlation coefficient 0.82. To better understand spatial characteristic of pollutants, the seasonal effect has been inferred from meteorological parameters including wind speed, temperature, precipitation and visibility over Seoul and other five locations, in Seoul, representing the varying pollutants' characteristics. We have found a significant impact of the pollutants on the seasonality behavior of meteorological parameters that vary by location. Excess pollution is strongly linked to temperature and precipitation variability especially, during summer and fall. The five pollutants under study show varying temporal behavior with different annual and monthly mean concentration patterns. The monthly means of NO2, CO, SO2 and PM10 show similar low concentrations during the summer season. In addition, during this season the satellite datasets indicate that most of pollution derived from anthropogenic sources owed to the high exponent values associated with the high AOD. Satellite data analysis and spatial maps shed the light on the pollutants origin either being of natural or anthropogenic source. It is noticed that the anthropogenic pollution is dominant from July to September even though the maps showed lower concentration than the other months.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2012
- Bibcode:
- 2012AGUFM.A11H0156P
- Keywords:
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- 0305 ATMOSPHERIC COMPOSITION AND STRUCTURE / Aerosols and particles