Chinese province-scale source apportionments for sulfate aerosol in 2005 evaluated by the tagged tracer method. (January 2017)

• Record Type: Journal Article
• Authors: Itahashi, Syuichi; Hayami, Hiroshi; Yumimoto, Keiya; Uno, Itsushi
• Is Part Of: Environmental pollution. Volume 220:Part B(2017)
• Page Start: 1366
• Page End: 1375
• Publication Date: 2017-01
• Subjects: Sulfate aerosol -- Source apportionment -- Tagged tracer method -- Regional chemical transport model -- East Asia; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2016.10.098
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Appropriate policies to improve air quality by reducing anthropogenic emissions are urgently needed. This is typified by the particulate matter (PM) problem and it is well known that one type of PM, sulfate aerosol (SO4 2− ), has a large-scale impact due to long range transport. In this study we evaluate the source–receptor relationships of SO4 2− over East Asia for 2005, when anthropogenic sulfur dioxide (SO2 ) emissions from China peaked. SO2 emissions from China have been declining since 2005–2006, so the possible maximum impact of Chinese contributions of SO4 2− is evaluated. This kind of information provides a foundation for policy making and the estimation of control effects. The tagged tracer method was applied to estimate the source apportionment of SO4 2− for 31 Chinese province-scale regions. In addition, overall one-year source apportionments were evaluated to clarify the seasonal dependency. Model performance was confirmed by comparing with ground-based observations over mainland China, Taiwan, Korea, and Japan, and the model results fully satisfied the performance goal for PM. We found the following results. Shandong and Hebei provinces, which were the largest and second largest SO2 sources in China, had the greatest impact over the whole of East Asia with apportionments of around 10–30% locally and around 5–15% in downwind receptor regions during the year. Despite large SO2 emissions, the impact of south China (e.g., Guizhou, Guangdong, and Sichuan provinces) was limited to local impact. These results suggest that the reduction policy in south China contributes to improving the local air quality, whereas policies in north and central China are beneficial for both the whole of China and downwind regions. Over Taiwan, Korea, and Japan, the impact of China was dominant; however, local contributions were important during summer. Graphical abstract: Highlights: Chinese source apportionment was evaluated for sulfate aerosol (SO4 2− ) by province. The tagged tracer method was applied to determine whole-year source apportionment. Shandong province had the highest SO2 emissions and largest impact over East Asia. SO2 reductions over north and central China are beneficial for China and downwind. SO2 reductions over south China contribute to the improvement of local air quality. Abstract : Detailed source apportionment for sulfate aerosol over East Asia by the tagged tracer method provides fundamental insight for policy making and the estimation of control effects.