Intermediate-Volatility Organic Compounds: A Large Source of Secondary Organic Aerosol
Identifieur interne : 000324 ( France/Analysis ); précédent : 000323; suivant : 000325Intermediate-Volatility Organic Compounds: A Large Source of Secondary Organic Aerosol
Auteurs : YUNLIANG ZHAO [États-Unis] ; Christopher J. Hennigan [États-Unis] ; Andrew A. May [États-Unis] ; Daniel S. Tkacik [États-Unis] ; Joost A. De Gouw [États-Unis] ; Jessica B. Gilman [États-Unis] ; William C. Kuster [États-Unis] ; Agnes Borbon [États-Unis, France] ; Allen L. Robinson [États-Unis]Source :
- Environmental science & technology [ 0013-936X ] ; 2014.
Descripteurs français
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- topic : Aérosol.
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Abstract
Secondary organic aerosol (SOA) is a major component of atmospheric fine particle mass. Intermediate-volatility organic compounds (IVOCs) have been proposed to be an important source of SOA. We present a comprehensive analysis of atmospheric IVOC concentrations and their SOA production using measurements made in Pasadena, California during the California at the Nexus of Air Quality and Climate Change (CalNex) study. The campaign-average concentration of primary IVOCs was 6.3 ± 1.9 μg m-3 (average ± standard deviation), which is comparable to the concentration of organic aerosol but only 7.4 ± 1.2% of the concentration of speciated volatile organic compounds. Only 8.6 ± 2.2% of the mass of the primary IVOCs was speciated. Almost no weekend/weekday variation in the ambient concentration of both speciated and total primary IVOCs was observed, suggesting that petroleum-related sources other than on-road diesel vehicles contribute substantially to the IVOC emissions. Primary IVOCs are estimated to produce about 30% of newly formed SOA in the afternoon during CalNex, about 5 times that from single-ring aromatics. The importance of IVOCs in SOA formation is expected to be similar in many urban environments.
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Robinson</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Forbes Avenue</s1><s2>Pittsburgh, Pennsylvania 15213</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Pittsburgh, Pennsylvania 15213</wicri:noRegion><orgName type="university">Université Carnegie-Mellon</orgName><placeName><settlement type="city">Pittsburgh</settlement><region type="state">Pennsylvanie</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Environmental science & technology</title><title level="j" type="abbreviated">Environ. sci. technol.</title><idno type="ISSN">0013-936X</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Environmental science & technology</title><title level="j" type="abbreviated">Environ. sci. technol.</title><idno type="ISSN">0013-936X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aerosols</term><term>Air pollution</term><term>California</term><term>Diurnal variation</term><term>Fine particle</term><term>Low volatile compound</term><term>Measurement campaign</term><term>Pollutant formation</term><term>Precursor</term><term>Secondary pollutant</term><term>Weekend effect</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Pollution air</term><term>Polluant secondaire</term><term>Aérosol</term><term>Particule fine</term><term>Formation polluant</term><term>Précurseur</term><term>Composé peu volatil</term><term>Campagne mesure</term><term>Variation diurne</term><term>Californie</term><term>Effet weekend</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Aérosol</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Secondary organic aerosol (SOA) is a major component of atmospheric fine particle mass. Intermediate-volatility organic compounds (IVOCs) have been proposed to be an important source of SOA. We present a comprehensive analysis of atmospheric IVOC concentrations and their SOA production using measurements made in Pasadena, California during the California at the Nexus of Air Quality and Climate Change (CalNex) study. The campaign-average concentration of primary IVOCs was 6.3 ± 1.9 μg m<sup>-3</sup> (average ± standard deviation), which is comparable to the concentration of organic aerosol but only 7.4 ± 1.2% of the concentration of speciated volatile organic compounds. Only 8.6 ± 2.2% of the mass of the primary IVOCs was speciated. Almost no weekend/weekday variation in the ambient concentration of both speciated and total primary IVOCs was observed, suggesting that petroleum-related sources other than on-road diesel vehicles contribute substantially to the IVOC emissions. Primary IVOCs are estimated to produce about 30% of newly formed SOA in the afternoon during CalNex, about 5 times that from single-ring aromatics. The importance of IVOCs in SOA formation is expected to be similar in many urban environments.</div></front></TEI><affiliations><list><country><li>France</li><li>États-Unis</li></country><region><li>Pennsylvanie</li></region><settlement><li>Pittsburgh</li></settlement><orgName><li>Université Carnegie-Mellon</li></orgName></list><tree><country name="États-Unis"><region name="Pennsylvanie"><name sortKey="Yunliang Zhao" sort="Yunliang Zhao" uniqKey="Yunliang Zhao" last="Yunliang Zhao">YUNLIANG ZHAO</name></region><name sortKey="Borbon, Agnes" sort="Borbon, Agnes" uniqKey="Borbon A" first="Agnes" last="Borbon">Agnes Borbon</name><name sortKey="De Gouw, Joost A" sort="De Gouw, Joost A" uniqKey="De Gouw J" first="Joost A." last="De Gouw">Joost A. De Gouw</name><name sortKey="Gilman, Jessica B" sort="Gilman, Jessica B" uniqKey="Gilman J" first="Jessica B." last="Gilman">Jessica B. Gilman</name><name sortKey="Hennigan, Christopher J" sort="Hennigan, Christopher J" uniqKey="Hennigan C" first="Christopher J." last="Hennigan">Christopher J. Hennigan</name><name sortKey="Kuster, William C" sort="Kuster, William C" uniqKey="Kuster W" first="William C." last="Kuster">William C. Kuster</name><name sortKey="May, Andrew A" sort="May, Andrew A" uniqKey="May A" first="Andrew A." last="May">Andrew A. May</name><name sortKey="Robinson, Allen L" sort="Robinson, Allen L" uniqKey="Robinson A" first="Allen L." last="Robinson">Allen L. Robinson</name><name sortKey="Tkacik, Daniel S" sort="Tkacik, Daniel S" uniqKey="Tkacik D" first="Daniel S." last="Tkacik">Daniel S. Tkacik</name></country><country name="France"><noRegion><name sortKey="Borbon, Agnes" sort="Borbon, Agnes" uniqKey="Borbon A" first="Agnes" last="Borbon">Agnes Borbon</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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