Diel and seasonal variations in the chemical composition of biomass burning aerosol

A. Hoffer, A. Gelencsér, M. Blazso, P. Guyon, P. Artaxo, M. O. Andreae

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Abstract

Fine aerosol particles were collected separately during daytime and nighttime at a tropical pasture site in Rondônia, Brazil, during the burning and dry-to-wet transition period in 2002. Total carbon (TC) and water-soluble organic carbon (WSOC) were measured by evolved gas analysis (EGA). Based on the thermochemical properties of the fine aerosol, the relative amounts of the volatile and refractory compounds were estimated. It was found that the thermally refractory (possibly higher molecular weight) compounds dominated the TC composition. Their contribution to TC was higher in the daytime than in the nighttime samples. The relative share of WSOC also showed a statistically significant diel variation as did its refractory fraction. Anhydrosugars and phenolic acids were determined by GC-MS and their diel variation was studied. Based on the decrease of their relative concentrations between the biomass burning and transition periods and their distinctly different diel variations, we suggest that the phenolic acids may undergo chemical transformations in the aerosol phase, possibly towards more refractory compounds (humic-like substances, HULIS), as has been suggested previously. These conclusions are supported by the results of the thermally assisted hydrolysis and methylation gas chromatography-mass spectrometry of the same filter samples.

Original languageEnglish
Pages (from-to)3505-3515
Number of pages11
JournalAtmospheric Chemistry and Physics
Volume6
Issue number11
Publication statusPublished - 2006

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diel variation
biomass burning
seasonal variation
chemical composition
aerosol
carbon
organic carbon
acid
methylation
hydrolysis
pasture
gas chromatography
mass spectrometry
filter
water
gas

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Diel and seasonal variations in the chemical composition of biomass burning aerosol. / Hoffer, A.; Gelencsér, A.; Blazso, M.; Guyon, P.; Artaxo, P.; Andreae, M. O.

In: Atmospheric Chemistry and Physics, Vol. 6, No. 11, 2006, p. 3505-3515.

Research output: Contribution to journalArticle

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AU - Hoffer, A.

AU - Gelencsér, A.

AU - Blazso, M.

AU - Guyon, P.

AU - Artaxo, P.

AU - Andreae, M. O.

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