rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Ambient measurements of the NOx reservoir species N₂O₅ using cavity ring-down spectroscopy
  name:
    name part: Geidosch, Justine Nicole.
    role:
      role term: creator
  name:
    name part: North, Simon W.
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2012
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource (xvii, 143 pages) : illustrations
  abstract: The regulated control of pollutants is essential to maintaining good air quality in urban areas. A major concern is the formation of tropospheric ozone, which can be especially harmful to those with lung conditions and has been linked to the occurrence of asthma. Ozone is formed through reactions of oxidized volatile organic compounds with nitrogen oxides, and the accurate modeling of the process is necessary for smart and effective regulations. Ambient measurements are important to understanding the mechanisms involved in tropospheric chemistry. This dissertation describes the characterization of a novel instrument for the ambient measurement of dinitrogen pentoxide, N₂O₅, and the results of several field studies. This is an important intermediate in the major nighttime loss pathway of nitrogen oxides. The understanding of this process requires correct modeling formation, as any nitrogen oxides not removed at night will result in increased ozone formation at sunrise. Calibration studies have been performed in order to quantify the loss of reactive species within the instrument, and the sampling flow and N₂O₅ detection have been well characterized. The results of the laboratory measurements are presented. Results are presented from the SHARP Field Study in Houston, TX in the spring of 2009. N₂O₅ measurements are compared to measurements of other species, including nitric acid and nitryl chloride, which were performed by other research groups. Mixing ratios exceeding 300 ppt were observed following ozone exceedance days, and a dependence of the concentration on both wind speed and direction was noticed. There was a strong correlation determined between N₂O₅ with HNO₃ and ClNO₂ indicating both a fast heterogeneous hydrolysis and N₂O₅ as the primary source of the species. Observed atmospheric lifetimes for N₂O₅ were short, ranging from several seconds to several minutes. We have also investigated the presence of N₂O₅ in College Station, TX. Low mixing ratios peaking at…
  note: by Justine Nicole Geidosch.
  note: "Major Subject: Chemistry"
  note: Electronic resource.
  note: Doctor of Philosophy Texas A&M University 2011 http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9887
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Chemistry
  subject:
    topic: Cavity ring-down spectroscopy
  subject:
    topic: Air quality
  subject:
    topic: Ambient measurements
  subject:
    topic: Atmospheric chemistry
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9887
  record info:
    record content source: TXA
    record creation date: 121115
    record change date: 20150922143233.0
    record identifier: in00002778370