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Title
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Chemical characterisation of marine aerosol at Amsterdam Island during the austral summer of 2006-2007
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Author
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Abstract
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| Atmospheric aerosols were collected in separate fine (<2.5 ìm) and coarse (>2.5 ìm) 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 m3. The organosulphates were characterised 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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Language
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English
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Source (journal)
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Journal of aerosol science. - Oxford, 1970, currens
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Publication
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Oxford
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2010
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ISSN
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0021-8502
[print]
1879-1964
[online]
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Volume/pages
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41
:1
(2010)
, p. 13-22
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ISI
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000274866800003
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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