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- Kirillova, Elena N.Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM) (author)
Sources and light absorption of water-soluble brown carbon aerosols in the outflow from northern China
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- LIBRIS-ID:oai:DiVA.org:su-89189
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-89189URI
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- High loadings of anthropogenic carbonaceous aerosols in Chinese air influence the air quality for over 1 billion people and impact the regional climate. A large fraction (17 – 80%) of this aerosol carbon is water soluble, promoting cloud formation and thus climate cooling. Recent findings, however, suggest that water-soluble carbonaceous aerosols also absorb sunlight, bringing additional direct and indirect climate warming effects, yet the extent and nature of light absorption by this water-soluble brown carbon (WS-BrC) and its relation to sources is poorly understood. Here, we combine source estimates constrained by dual-carbon-isotope with light absorption measurements of WS-BrC for a March 2011 campaign at the Korea Climate Observatory at Gosan (KCOG), a receptor station in SE Yellow Sea for the outflow from N. China. The mass absorption cross-section (MAC) of WS-BrC for air masses from N. China were in general higher (0.8 – 1.1 m2/g), than from other source regions (0.3 – 0.8 m2/g). We estimate that this effect corresponds to 13 – 49% of the radiative forcing caused by light absorption by black carbon. Radiocarbon constraints show that the WS-Br in Chinese outflow had significantly higher amounts of fossil sources (30 – 50%) compared to previous findings in S. Asia, N. America and Europe. Stable carbon (δ13C) measurements indicated influence of aging during air mass transport. These results indicate the importance of incorporating WS-BrC in climate models and the need to constrain climate effects by emission source sector.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
- water-soluble organic carbon
- carbon isotopes
- source apportionment
- light absorption properties
- aerosol aging
- China
- Applied Environmental Science
- tillämpad miljövetenskap
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- Andersson, AugustStockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)(Swepub:su)auand (author)
- Han, JihyunDepartment of Earth and Environmental Sciences, Korea University (author)
- Lee, MeehyeDepartment of Earth and Environmental Sciences, Korea University (author)
- Gustafsson, ÖrjanStockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)(Swepub:su)ogust (author)
- Stockholms universitetInstitutionen för tillämpad miljövetenskap (ITM) (creator_code:org_t)
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