Organic compounds present in the natural Amazonian aerosol : characterization by gas chromatography–mass spectrometry

Graham, Bim, Guyon, Pascal, Taylor, Philip E., Artaxo, Paulo, Maenhaut, Willy, Glovsky, M. Michael, Flagan, Richard C. and Andreae, Meinrat O. 2003, Organic compounds present in the natural Amazonian aerosol : characterization by gas chromatography–mass spectrometry, Journal of geophysical research : atmospheres, vol. 108, no. D24, pp. AAC 6-1-AAC 6-13, doi: 10.1029/2003JD004049.

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Title Organic compounds present in the natural Amazonian aerosol : characterization by gas chromatography–mass spectrometry
Author(s) Graham, Bim
Guyon, Pascal
Taylor, Philip E.ORCID iD for Taylor, Philip E.
Artaxo, Paulo
Maenhaut, Willy
Glovsky, M. Michael
Flagan, Richard C.
Andreae, Meinrat O.
Journal name Journal of geophysical research : atmospheres
Volume number 108
Issue number D24
Start page AAC 6-1
End page AAC 6-13
Total pages 13
Publisher Wiley-Blackwell Publishing, Inc.
Place of publication Hoboken, N.J.
Publication date 2003-12-27
ISSN 0148-0227
Keyword(s) gas chromatography–mass spectrometry
sugar alcohols
biogenic aerosol
organic aerosol
Summary [1] As part of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA)-Cooperative LBA Airborne Regional Experiment (CLAIRE) 2001 campaign in July 2001, separate day and nighttime aerosol samples were collected at a ground-based site in Amazonia, Brazil, in order to examine the composition and temporal variability of the natural “background” aerosol. We used a high-volume sampler to separate the aerosol into fine (aerodynamic diameter, AD < 2.5 μm) and coarse (AD > 2.5 μm) size fractions and quantified a range of organic compounds in methanolic extracts of the samples by a gas chromatographic-mass spectrometric technique. The carbon fraction of the compounds could account for an average of 7% of the organic carbon (OC) in both the fine and coarse aerosol fractions. We observed the highest concentrations of sugars, sugar alcohols, and fatty acids in the coarse aerosol samples, which suggests that these compounds are associated with primary biological aerosol particles (PBAP) observed in the forest atmosphere. Of these, trehalose, mannitol, arabitol, and the fatty acids were found to be more prevalent at night, coinciding with a nocturnal increase in PBAP in the 2–10 μm size range (predominantly yeasts and other small fungal spores). In contrast, glucose, fructose, and sucrose showed persistently higher daytime concentrations, coinciding with a daytime increase in large fungal spores, fern spores, pollen grains, and, to a lesser extent, plant fragments (generally >20 μm in diameter), probably driven by lowered relative humidity and enhanced wind speeds/convective activity during the day. For the fine aerosol samples a series of dicarboxylic and hydroxyacids were detected with persistently higher daytime concentrations, suggesting that photochemical production of a secondary organic aerosol from biogenic volatile organic compounds may have made a significant contribution to the fine aerosol. Anhydrosugars (levoglucosan, mannosan, galactosan), which are specific tracers for biomass burning, were detected only at low levels in the fine aerosol samples. On the basis of the levoglucosan-to-OC emission ratio measured for biomass burning aerosol, we estimate that an average of ∼16% of the OC in the fine aerosol was due to biomass burning during CLAIRE 2001, indicating that the major fraction was associated with biogenic particles.
Language eng
DOI 10.1029/2003JD004049
Field of Research 060199 Biochemistry and Cell Biology not elsewhere classified
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
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