Atmospheric chemistry in stereo: A new look at secondary organic aerosols from isoprene
2011 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 38, L11807- p.Article in journal (Refereed) Published
Isoprene, a compound emitted by vegetation, could be a major contributor to secondary organic aerosols (SOA) in the atmosphere. The main evidence for this contribution were the 2-methylbutane-1,2,3,4-tetraols, or 2-methyltetrols (2-methylerythritol and 2-methylthreitol) present in ambient aerosols. In this work, the four stereoisomers of these tetraols were analyzed in aerosols from Aspvreten, Sweden. 2-C-methyl-D-erythritol was found in excess over its enantiomer in the Spring/Summer, by up to 29% in July. This clearly indicated some biological origins for this enantiomer, consistent with its well-documented production by plants and other living organisms. In addition, a minimum of 20 to 60% of the mass of racemic tetraols appeared from biological origin. Thus, the SOA mass produced by isoprene in the atmosphere is less than what indicated by the 2-methyltetrols in aerosols. Our results also demonstrate that stereochemical speciation can distinguish primary and secondary organic material in atmospheric aerosols.
Place, publisher, year, edition, pages
2011. Vol. 38, L11807- p.
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-67582DOI: 10.1029/2011GL047323ISI: 000291813300002OAI: oai:DiVA.org:su-67582DiVA: diva2:470565
authorCount :92011-12-292011-12-292013-04-17Bibliographically approved