| Identifying organic aerosol sources by comparing functional group composition in chamber and atmospheric particles. | |
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MedLine Citation:
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PMID: 21317360 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Measurements of submicron particles by Fourier transform infrared spectroscopy in 14 campaigns in North America, Asia, South America, and Europe were used to identify characteristic organic functional group compositions of fuel combustion, terrestrial vegetation, and ocean bubble bursting sources, each of which often accounts for more than a third of organic mass (OM), and some of which is secondary organic aerosol (SOA) from gas-phase precursors. The majority of the OM consists of alkane, carboxylic acid, hydroxyl, and carbonyl groups. The organic functional groups formed from combustion and vegetation emissions are similar to the secondary products identified in chamber studies. The near absence of carbonyl groups in the observed SOA associated with combustion is consistent with alkane rather than aromatic precursors, and the absence of organonitrate groups can be explained by their hydrolysis in humid ambient conditions. The remote forest observations have ratios of carboxylic acid, organic hydroxyl, and nonacid carbonyl groups similar to those observed for isoprene and monoterpene chamber studies, but in biogenic aerosols transported downwind of urban areas the formation of esters replaces the acid and hydroxyl groups and leaves only nonacid carbonyl groups. The carbonyl groups in SOA associated with vegetation emissions provides striking evidence for the mechanism of esterification as the pathway for possible oligomerization reactions in the atmosphere. Forest fires include biogenic emissions that produce SOA with organic components similar to isoprene and monoterpene chamber studies, also resulting in nonacid carbonyl groups in SOA. |
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Authors:
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Lynn M Russell; Ranjit Bahadur; Paul J Ziemann |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2011-02-11 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 108 ISSN: 1091-6490 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-03-03 Completed Date: 2011-05-09 Revised Date: 2011-07-26 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 3516-21 Citation Subset: IM |
Affiliation:
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Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA. lmrussell@ucsd.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aerosols
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analysis* Atmosphere / chemistry* Biomass Fires Fossil Fuels / analysis Geography Organic Chemicals / analysis* Particulate Matter / chemistry* Seawater / chemistry Spectroscopy, Fourier Transform Infrared |
| Chemical | |
Reg. No./Substance:
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0/Aerosols; 0/Fossil Fuels; 0/Organic Chemicals; 0/Particulate Matter |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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