Measuring Atmospheric Ozone and Nitrogen Dioxide Concentration by Differential Optical Absorption Spectroscopy Metadata
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- Main Title Measuring Atmospheric Ozone and Nitrogen Dioxide Concentration by Differential Optical Absorption Spectroscopy
Author: Jerez, Carlos J.Creator Type: Personal
Chair: Acevedo, Miguel F.Contributor Type: PersonalContributor Info: Major Professor
Committee Member: Atkinson, Samuel F.Contributor Type: Personal
Committee Member: Dong, PinliangContributor Type: Personal
Committee Member: McGregor, Kent M.Contributor Type: Personal
Committee Member: Vaidyanathan, VijayContributor Type: Personal
Name: University of North TexasPlace of Publication: Denton, TexasAdditional Info: www.unt.edu
- Creation: 2011-12
- Content Description: The main objective was to develop a procedure based on differential optical absorption spectroscopy (DOAS) to measure atmospheric total column of ozone, using the automated instrument developed at the University of North Texas (UNT) by Nebgen in 2006. This project also explored the ability of this instrument to provide measurements of atmospheric total column nitrogen dioxide. The instrument is located on top of UNT’s Environmental Education, Science and Technology Building. It employs a low cost spectrometer coupled with fiber optics, which are aimed at the sun to collect solar radiation. Measurements taken throughout the day with this instrument exhibited a large variability. The DOAS procedure derives total column ozone from the analysis of daily DOAS Langley plots. This plot relates the measured differential column to the airmass factor. The use of such plots is conditioned by the time the concentration of ozone remains constant. Observations of ozone are typically conducted throughout the day. Observations of total column ozone were conducted for 5 months. Values were derived from both DOAS and Nebgen’s procedure and compared to satellite data. Although differences observed from both procedures to satellite data were similar, the variability found in measurements was reduced from 70 Dobson units, with Nebgen’s procedure, to 4 Dobson units, with the DOAS procedure.A methodology to measure atmospheric nitrogen dioxide using DOAS was also investigated. Although a similar approach to ozone measurements could be applied, it was found that such measurements were limited by the amount of solar radiation collected by the instrument. Observations of nitrogen dioxide are typically conducted near sunrise or sunset, when solar radiation experiences most of the atmospheric absorption.
- Keyword: Ozone
- Keyword: differential optical absorption spectroscopy
- Keyword: nitrogen dioxide
Name: UNT Theses and DissertationsCode: UNTETD
Name: UNT LibrariesCode: UNT
- Rights Access: public
- Rights Holder: Jerez, Carlos J.
- Rights License: copyright
- Rights Statement: Copyright is held by the author, unless otherwise noted. All rights reserved.
- Thesis or Dissertation
- Archival Resource Key: ark:/67531/metadc103336
- Academic Department: Department of Biological Sciences
- Degree Discipline: Environmental Science
- Degree Level: Doctoral
- Degree Name: Doctor of Philosophy
- Degree Publication Type: disse
- Degree Grantor: University of North Texas
- Embargo Note: Restricted until January 1, 2017