Secondary organic aerosol: Difference between revisions
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| ⚫ | A '''secondary organic aerosol''' ('''SOA''') is a [[molecule]]s produced via [[oxidation]] over several generations of a parent organic molecule.<ref name=jpca>{{Cite journal|title = Secondary Organic Aerosol Formation from Low-NOx Photooxidation of Dodecane: Evolution of Multigeneration Gas-Phase Chemistry and Aerosol Composition|journal = The Journal of Physical Chemistry A|date = 2012-06-21|issn = 1089-5639|pages = 6211–6230|volume = 116|issue = 24|doi = 10.1021/jp211531h|pmid = 22424261|first = Lindsay D.|last = Yee|first2 = Jill S.|last2 = Craven|first3 = Christine L.|last3 = Loza|first4 = Katherine A.|last4 = Schilling|first5 = Nga Lee|last5 = Ng|first6 = Manjula R.|last6 = Canagaratna|first7 = Paul J.|last7 = Ziemann|first8 = Richard C.|last8 = Flagan|first9 = John H.|last9 = Seinfeld|bibcode = 2012JPCA..116.6211Y}}</ref> In contrast to primary organic aerosols, which are emitted directly from the [[biosphere]], secondary organic aerosols are formed via [[nucleation#Homogeneous|homogeneous nucleation]] through the successive oxidation of [[gas]]-phase [[organic compound]]s. These gas-phase species exert high [[vapor pressure]]s, meaning they are volatile and stable in the gas-phase, however, upon oxidation, the increased [[chemical polarity|polarity]] of the molecules results in a reduction of vapor pressure. After sufficient oxidation, the vapor pressure is sufficiently low that the gas-phase compound partitions into the [[solid]]-phase, producing secondary organic matter. |
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SOAs represent a significant proportion of [[aerosol]]s contained in the [[troposphere]].<ref name=jpca/> |
SOAs represent a significant proportion of [[aerosol]]s contained in the [[troposphere]].<ref name=jpca/> |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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== See also == |
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=== bibliography === |
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* Alastair C. Lewis (2018), ''[http://science.sciencemag.org/content/359/6377/744?iss=6377 The changing face of urban air pollution]'' ; Science 16 révrier 2018:Vol. 359, Issue 6377, pp. 744-745| DOI: 10.1126/science.aar4925 |
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* Brian C. McDonald & al. (2018) ''[http://science.sciencemag.org/content/359/6377/760.full Volatile chemical products emerging as largest petrochemical source of urban organic emissions]'' ; Science 16 Feb 2018: Vol. 359, Issue 6377, pp. 760-764 |DOI: 10.1126/science.aaq0524 |[http://science.sciencemag.org/content/359/6377/760 résumé] |
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=== Bibliography === |
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* {{cite journal | doi = 10.1126/science.aar4925 }} |
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* {{cite journal | doi = 10.1126/science.aaq0524 }} |
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[[Category:Aerosols]] |
[[Category:Aerosols]] |
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[[Category:Atmosphere of Earth]] |
[[Category:Atmosphere of Earth]] |
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[[Category:Atmospheric dynamics]] |
[[Category:Atmospheric dynamics]] |
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{{organic-compound-stub}} |
{{organic-compound-stub}} |
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Revision as of 23:26, 5 March 2019
A secondary organic aerosol (SOA) is a molecules produced via oxidation over several generations of a parent organic molecule.[1] In contrast to primary organic aerosols, which are emitted directly from the biosphere, secondary organic aerosols are formed via homogeneous nucleation through the successive oxidation of gas-phase organic compounds. These gas-phase species exert high vapor pressures, meaning they are volatile and stable in the gas-phase, however, upon oxidation, the increased polarity of the molecules results in a reduction of vapor pressure. After sufficient oxidation, the vapor pressure is sufficiently low that the gas-phase compound partitions into the solid-phase, producing secondary organic matter.
SOAs represent a significant proportion of aerosols contained in the troposphere.[1]
A common misconception is that the aerosol refers to the solid phase of the compound, where in reality, by definition, it is the combination of the gas- and solid-phases which constitute the aerosol.
References
- ^ a b Yee, Lindsay D.; Craven, Jill S.; Loza, Christine L.; Schilling, Katherine A.; Ng, Nga Lee; Canagaratna, Manjula R.; Ziemann, Paul J.; Flagan, Richard C.; Seinfeld, John H. (2012-06-21). "Secondary Organic Aerosol Formation from Low-NOx Photooxidation of Dodecane: Evolution of Multigeneration Gas-Phase Chemistry and Aerosol Composition". The Journal of Physical Chemistry A. 116 (24): 6211–6230. Bibcode:2012JPCA..116.6211Y. doi:10.1021/jp211531h. ISSN 1089-5639. PMID 22424261.
Bibliography
- . doi:10.1126/science.aar4925.
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