Chemical characterisation of marine aerosol at Amsterdam Island during the austral summer of 2006-2007

M. Claeys, W. Wang, R. Vermeylen, I. Kourtchev, X. Chi, Y. Farhat, J.D. Surratt, Y. Gómez-González, J. Sciare, W. Maenhaut

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Abstract

Atmospheric aerosols were collected in separate fine (<2.5 μm) and coarse (>2.5 μm) 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 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.
Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalJournal of Aerosol Science
Volume41
Issue number1
DOIs
Publication statusPublished - Jan 2010
Externally publishedYes

Keywords

  • Marine aerosols
  • Water-soluble organic carbon
  • Secondary organic aerosol
  • Organosulphates
  • Isoprene

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