Document Detail


SOA formation by biogenic and carbonyl compounds: data evaluation and application.
MedLine Citation:
PMID:  17612167     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The organic fraction of atmospheric aerosols affects the physical and chemical properties of the particles and their role in the climate system. Current models greatly underpredict secondary organic aerosol (SOA) mass. Based on a compilation of literature studies that address SOA formation, we discuss different parameters that affect the SOA formation efficiency of biogenic compounds (alpha-pinene, isoprene) and aliphatic aldehydes (glyoxal, hexanal, octanal, hexadienal). Applying a simple model, we find that the estimated SOA mass after one week of aerosol processing under typical atmospheric conditions is increased by a few microg m(-3) (low NO(x) conditions). Acid-catalyzed reactions can create > 50% more SOA mass than processes under neutral conditions; however, other parameters such as the concentration ratio of organics/NO(x), relative humidity, and absorbing mass are more significant. The assumption of irreversible SOA formation not limited by equilibrium in the particle phase or by depletion of the precursor leads to unrealistically high SOA masses for some of the assumptions we made (surface vs volume controlled processes).
Authors:
Barbara Ervens; Sonia M Kreidenweis
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  41     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-07-06     Completed Date:  2007-08-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3904-10     Citation Subset:  IM    
Affiliation:
Atmospheric Science Department, Colorado State University, Fort Collins, Colorado 80523, USA. barbara.ervens@noaa.gov
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MeSH Terms
Descriptor/Qualifier:
Aerosols / chemistry*
Aldehydes / chemistry*
Butadienes / chemistry*
Hemiterpenes / chemistry*
Kinetics
Models, Chemical
Monoterpenes / chemistry*
Pentanes / chemistry*
Thermodynamics
Chemical
Reg. No./Substance:
0/Aerosols; 0/Aldehydes; 0/Butadienes; 0/Hemiterpenes; 0/Monoterpenes; 0/Pentanes; 78-79-5/isoprene; 80-56-8/alpha-pinene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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