Atmospheric Concentration of Ammonia, Nitrogen Dioxide, Nitric Acid, and Sulfur Dioxide by Passive Method within Osaka Prefecture and Their Emission Inventory
2011
Annual emission map for NH3, NOX, and SO2 within Osaka prefecture was shown according to the EAGrid2000-Japan emission database. The median emission of NH3, NOX, and SO2 was 1.94, 24.8, 1.32 ton/km2/year, respectively, while that at 11 passive sampling sites was 1.61, 17.3, 0.74 ton/km2/year, respectively. Monthly emission for NH3 showed apparent seasonal trends, being high in summer and low in winter. That for NOX and SO2 was slightly high in winter and low in summer and constant through the year, respectively. Atmospheric concentration of NH3, NO2, HNO3, and SO2 by the passive method was compared with corresponding emission inventory. Average concentrations of HNO3, SO2, NH3, and NO2 in June were 16–67, 23–135, 21–173, and 149–873 nmol/m3, respectively, while those in October were 5–21, 16–72, 14–196, and 169–1,167 nmol/m3, respectively. The emission inventory flux of SO2, NOX, and NH3 was calculated both within 1 × 1- and 3 × 3-km mesh. It was a small difference between June and October for SO2 and NOX in the both meshes. For NH3, emission flux in June was around twofold of that in October. The NH3 correlation between concentration and emission flux was excellent in the 1 × 1 km mesh, although somewhat decreased in the 3 × 3 km mesh. In the case of NO2, the correlation for the 3 × 3 km mesh, however, was more increased than the 1 × 1 km mesh. The correlation for HNO3 and SO2 was a small difference with the both meshes. Monthly concentrations of NH3, NO2, HNO3, and SO2 were compared with their corresponding gases emission at whole-year survey sites. Concentration of NH3 was high from July to November, while emission of NH3 was high from June to September (summer) and low from December to March (winter). Trend of NO2 concentration was high in winter and low in summer, a similar tendency to that of NOX emission. On the other hand, the trend of HNO3 concentration was high in summer and low in winter. There was no particular seasonal trend of SO2 concentration and SO2 emission had also no seasonal variation but was constant.
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