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Chamber investigations of secondary organic aerosol formation

Citation

Cocker, David Rea (2001) Chamber investigations of secondary organic aerosol formation. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-01232007-072920

Abstract

Hydrocarbons in the atmosphere undergo oxidation that can lead to the formation of semi-volatile products. These products undergo gas-to-particle conversion to form secondary organic aerosol (SOA). Reaction chambers provide a controlled environment which gas-to-particle conversion is investigated. First, an extensive investigation into the aerosol forming potential of 14 biogenic hydrocarbons is reported.

Traditionally, chamber experiments have been performed at relative humidity levels such that the aerosol investigated is water-free. However, atmospheric conditions are typically such that ambient aerosol contains water. A new facility to improve measurement of SOA formation under humid conditions is described. A comprehensive study on how the presence of water affects gas-to-particle partitioning in the alpha-pinene ozonolysis and m-xylene and mesitylene photooxidation systems is reported.

The diurnal trends in the hygroscopic nature of Pasadena, CA, aerosol is reported for late summer, 1999. Presented are additional investigations into the identification of products resulting from ozonolysis of alpha-pinene, beta-pinene, sabinene, Delta^3-carene, and cyclohexene. A field campaign to identify similar monoterpene oxidation products in a forest environment is presented. Finally, an estimate of the global aerosol burden from biogenic hydrocarbons is provided.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Environmental Science and Engineering
Thesis Availability:Restricted to Caltech community only
Research Advisor(s):
  • Seinfeld, John H. (advisor)
  • Flagan, Richard C. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:27 November 2000
Record Number:CaltechETD:etd-01232007-072920
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-01232007-072920
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:294
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:23 Jan 2007
Last Modified:26 Dec 2012 02:28

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