Atmospheric carbonyl compounds in rural and urban Texas: Formation, methodology, and statistical modeling
| dc.contributor.advisor | Fraser, Matthew P. | en_US |
| dc.creator | Friedfeld, Stephen Judah | en_US |
| dc.date.accessioned | 2009-06-04T08:33:20Z | en_US |
| dc.date.available | 2009-06-04T08:33:20Z | en_US |
| dc.date.issued | 2002 | en_US |
| dc.description.abstract | Atmospheric carbonyl compounds, specifically aldehydes and ketones, were measured in both rural and urban regions in Texas. The biogenic or rural study examined the extent of conversion from primary biogenic hydrocarbons to secondary carbonyls. The anthropogenic or urban studies investigated techniques for measuring carbonyl compounds; statistical modeling was applied in one such study to elucidate the primary and secondary contributions to formaldehyde formation. From the biogenic study, the spatial variation of isoprene and its reaction products' concentrations are strong functions of the immediate land cover. Spatial differences between sampling sites need to include NOx data to account for urban and rural influences. Finally, both ozone attributable to biogenic hydrocarbon oxidation and ozone formation potential are predicted to be insignificant under high VOC/NOx ratios typical of rural areas, but may be important under conditions where NOx levels are elevated. From the anthropogenic studies, a daylong sampling period sufficiently captures persistent low-lying carbonyl levels, but overlooks small scale fluctuations. Furthermore, the low concentration precision limit of real-time sampling through a DFG sensor produces similar bias as time-integrated wet chemical quantification, and validates the use of the DFG system for urban atmospheric studies. Finally, two distinct statistical models attribute nearly two-thirds (ratio 1.75) of HCHO formation to secondary VOC reactions, and one-third to primary emissions. | en_US |
| dc.format.extent | 111 p. | en_US |
| dc.format.mimetype | application/pdf | en_US |
| dc.identifier.callno | THESIS ENV.SCI. 2002 FRIEDFELD | en_US |
| dc.identifier.citation | Friedfeld, Stephen Judah. "Atmospheric carbonyl compounds in rural and urban Texas: Formation, methodology, and statistical modeling." (2002) Diss., Rice University. <a href="https://hdl.handle.net/1911/18080">https://hdl.handle.net/1911/18080</a>. | en_US |
| dc.identifier.uri | https://hdl.handle.net/1911/18080 | en_US |
| dc.language.iso | eng | en_US |
| dc.rights | Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder. | en_US |
| dc.subject | Geophysics | en_US |
| dc.subject | Environmental science | en_US |
| dc.title | Atmospheric carbonyl compounds in rural and urban Texas: Formation, methodology, and statistical modeling | en_US |
| dc.type | Thesis | en_US |
| dc.type.material | Text | en_US |
| thesis.degree.department | Environmental Science | en_US |
| thesis.degree.discipline | Engineering | en_US |
| thesis.degree.grantor | Rice University | en_US |
| thesis.degree.level | Doctoral | en_US |
| thesis.degree.name | Doctor of Philosophy | en_US |
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