Journal
ATMOSPHERIC ENVIRONMENT
Volume 214, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2019.116858
Keywords
Carbonaceous aerosols; Radiocarbon analysis; Source attribution; Natural sources
Funding
- Environment Research and Technology Development Fund of the Ministry of Environment, Japan [2-1403, S7]
- JSPS KAKENHI [JP26550021]
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The sources of elemental (EC) and organic carbon (OC) aerosols in Asian outflow were investigated in the spring of 2015 in terms of radiocarbon (C-14) and molecular marker analyses. The contribution of fossil fuel (FF) sources to carbonaceous aerosols (TC) significantly increased in polluted air masses with enhancements in the concentrations of carbon monoxide. For EC, FF sources dominated in the polluted air masses. For OC, the contributions of non-FF sources other than biomass burning (BB) were found to be significant (comparable to or higher than those of FF sources), especially in air masses with higher values of the water-soluble fraction of OC (f(WSOC)) and C-14 concentrations ((FC)-C-14). Positive correlations between f(WSOC) and (FC)-C-14 indicate that the origins of TC (mainly OC) have great impacts on the water solubility variability and the subsequent cloud formation processes of OC during transport. We found the importance of natural sources as possible origins of OC in non-polluted (Le., background) air. This study raises the need to further investigate the source apportionment of OC, especially its natural origins, for more accurately assessing the climatic impacts of EC and OC in East Asia.
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