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Chemical characterisation of marine aerosol at Amsterdam Island during the austral summer of 2006-2007
Claeys, M.; Wang, W.; Vermeylen, R.; Kourtchev, I.; Chi, X.; Farhat, Y.; Surratt, J.; Gómez-González, Y.; Sciare, J.; Maenhaut, W. (2010). Chemical characterisation of marine aerosol at Amsterdam Island during the austral summer of 2006-2007. Journal of aerosol science 41(1): 13-22. https://dx.doi.org/10.1016/j.jaerosci.2009.08.003
In: Journal of aerosol science. Thomson Reuters. ISSN 0021-8502; e-ISSN 1879-1964
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| Trefwoord |
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| Author keywords |
Marine aerosols; Water-soluble organic carbon; Secondary organicaerosol; Organosulphates; Isoprene |
| Auteurs | | Top |
- Claeys, M.
- Wang, W.
- Vermeylen, R.
- Kourtchev, I.
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- Chi, X.
- Farhat, Y.
- Surratt, J.
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- Gómez-González, Y.
- Sciare, J.
- Maenhaut, W.
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| Abstract |
Atmospheric aerosols were collected in separate fine (< 2.5 mu m) and coarse (> 2.5 mu m) size fractions in the period December 2006-March 2007 at Amsterdam Island in the southern Indian Ocean. A major objective of the study was to assess biogenic impact on the marine aerosol. The samples were analysed for organic carbon, water-soluble organic carbon, major inorganic ionic species, and organic species, including methanesulphonate (MSA), dicarboxylic acids, and organosulphates. The concentrations of sea salt, non-sea-salt sulphate, and water-soluble and water-insoluble organic matter (WSOM and WIOM) were estimated. Sea salt dominated the composition of the aerosol and accounted for 83% and 91% of the sum of the mass of the four aerosol types in the fine and coarse size fractions, respectively. WSOM, which can serve as a proxy for biogenic secondary organic aerosol (SOA), accounted for only 2.8% of the sum of the mass of the four aerosol types in the fine size fraction. MSA was the dominating organic compound with a median concentration of 47 ng m(-3). The organosulphates were chatacterised as sulphate esters of hydroxyl acids and a dihydroxylaldehyde, which may originate from the oxidation of algal/bacterial unsaturated fatty acid residues. No evidence was found for isoprene SOA. |
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