Period works:
We firstly did δ13C/∆14C-diagnosed sources of BC, OC, WSOC, and WIOC in January 2014 campaign. Second, we have conducted light-absorption of carbonaceous aerosol includes WSOC and BC in January 2014 campaign, including BTH, YRD, KCOG, PRD, and SC, with aim to explore how the fossil sources influence light-absorbing aerosols. Third, with an aim to uncover the seasonal trends of emission sources of carbonaceous aerosol in E. Asia, we performed a four-season observation of BC and its sources at four key hotspot emission regions in China: BTH, YRD, PRD, and SC basin.
From the first study, we found that fossil sources (>50%) dominated the BC at all sites with most stemming from coal combustion, except for Shanghai, where liquid fossil sources were the largest. This study highlights high fossil contributions for all carbonaceous aerosol sub-compartments in East Asia, and suggests different transformations for different classes of carbonaceous aerosols.
The second study, the light-absorbing values were higher than the previous observations. The average fraction of total direct absorbance by WSOC relative to EC accounts for ∼11 ± 5% over E. Asia. Our result suggest the large fossil combustion may contribute to the regional climate change and earth surface energy budget.
Our third study of seasonal BC sources at four key economic zones of China, highest BC concentrations appeared during winter at BTH, YRD, and PRD, while observed loadings were also very high in the other seasons, e.g. spring at SC, fall at PRD, and summer at YRD. The fraction coal combustion of BTH-BC is much higher than YRD-BC, PRD-BC, and SC-BC. Conversely, liquid fossil combustion dominates in YRD, PDR, and SC, and less at BTH. For the seasonal BC aerosol, the seasonal variations in carbon isotope signature at BTH, PRD, and SC indicate seasonally shifting emissions between different sources. Whereas the clusters of isotope signature at YRD shows that BC sources stem from similar energy shares between seasons.
Publications/Manuscripts:
1. Fang, W. Z.; Andersson, A.; Zheng, M.; Lee, M.; Holmstrand, H.; Kim, S-W.; Du, K.; Gustafsson, Ö. Divergent Evolution of Carbonaceous Aerosols during Dispersal of East Asian Haze. (Scientific Reports, 2017, 7: 10422, DOI:10.1038/s41598-017-10766-4)
2. Yu, K. Y.; Du, K.; incl. Fang, W. Z.; Gustafson, Ö. et al. Characterizing and Sourcing Ambient PM2.5 over Key Emission Regions in China III: Carbon Isotope Apportionment and EC tracer method. (accepted by Atmos. Environ)
3. Fang, W. Z.; Andersson, A.; Zheng, M.; Lee, M.; Kim, S-W.; Du, K.; Gustafsson, Ö. Sunlight-absorption Properties of Black and Brown Carbon Aerosols during January 2014 East Asian Haze. (Manuscript prepared to submit to Atmospheric Chemistry & Physics, 2018)
4. Fang, W. Z.; Du, K.; Andersson, A.; Cho, C-Y.; Kim, S-W.; & Gustafsson, Ö. Seasonal-regional sources of black carbon aerosol in East, South, West, and North China. (under review with Journal of Geophysical Research-Atmospheres, 2018)
conference poster:
Fang, W. Z.; Andersson, A.; Zheng, M.; Lee, M.; Kim, S-W.; Du, K.; Gustafsson, Ö. Radiocarbon-based source apportionment of organic, elemental, water-soluble organic carbon aerosols and light absorption of water-soluble organic carbon aerosols in the East Asia, 2016 AGU Fall Meeting, San Francisco, California
