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Laboratory measurements and modeling of trace atmospheric species

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dc.contributor.advisor Jeffrey I. Steinfeld and Mario J. Molina. en_US Sheehy, Philip M. (Philip Michael) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Chemistry. en_US 2008-03-26T20:33:17Z 2008-03-26T20:33:17Z 2005 en_US 2005 en_US
dc.identifier.uri en_US
dc.description Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2005. en_US
dc.description Vita. en_US
dc.description Includes bibliographical references (p. 129-145). en_US
dc.description.abstract Trace species play a major role in many physical and chemical processes in the atmosphere. Improving our understanding of the impact of each species requires a combination of laboratory exper- imentation, field measurements, and modeling. The results presented here focus on spectroscopic and kinetic laboratory measurements and photochemical box modeling. Laboratory experiments were conducted using IntraCavity Laser Absorption Spectroscopy (ICLAS), a high-resolution, high sensitivity spectroscopic method that had been used primarily for static cell measurements in the Steinfeld Laboratory at MIT. Several modifications and improvements have been made to expand its versatility. Firstly, a discharge flow tube was coupled with the ICLA Spectrometer, and the formation kinetics of nitrosyl hydride, HNO, were measured as a means to test the system. Secondly, a novel edge-tuner was introduced as a means to expand the spectral range of the ICLA Spectrometer. An experiment for the detection of the hydroperoxyl radical employing the edge-tuner in the ICLA Spectrometer is discussed and proposed. The results from the laboratory measurements are followed by the presentation of a near-explicit kinetic box model designed to improve our understanding of the oxidative capacity of the urban troposphere in the Mexico City Metropolitan Area (MCMA). The box model was constructed using the Master Chemical Mechanism and was constrained using a large dataset of field measurements collected during the 2003 MCMA field campaign. en_US
dc.description.abstract (cont.) The modeling is focused on the hydroxy and hydroperoxyl radicals (OH and HO₂), with an emphasis on the role of volatile organic compounds (VOCs) in the formation of both species. en_US
dc.description.statementofresponsibility by Philip M. Sheehy. en_US
dc.format.extent 145, [1] p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri en_US
dc.rights.uri en_US
dc.subject Chemistry. en_US
dc.title Laboratory measurements and modeling of trace atmospheric species en_US
dc.type Thesis en_US Ph.D. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Chemistry. en_US
dc.identifier.oclc 61858240 en_US

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