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  • ozone  (2)
  • 1
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    Assessment of Trends in the Vertical Distribution of Ozone (1998)
    Zurich, Toronto : Stratospheric Processes and their Role in Climate (SPARC)
    Details
    Keywords: ozone ; stratosphere
    Description / Table of Contents: One of the largest uncertainties in determining the effect of CFC’s on stratospheric ozone has been the magnitude of the trends in the altitude region between 15 and 20 km. In the 1994 WMO-UNEP ozone assessment, SAGE was reported as giving trends up to -0± 8% per decade at northern mid-latitudes, while the ozonesonde stations gave a trend of -± 3% per decade. In 1996 the SPARC panel on Understanding Ozone Trends and the International Ozone Commission decided to collaborate, under the auspices of the World Climate Research Programme and the World Meteorological Organisation, on a study to carefully re-evaluate the ground-based and satellite data to resolve this discrepancy. The philosophy of the study was similar to that of the International Ozone Trends Panel of 1988 which addressed the total ozone measurements. The published literature was not simply reviewed, but a critical re-analysis and interpretation of the vertical profiles of ozone was performed. One of the principal aims of the report was to determine if there was sufficient confidence in the long-term measurement systems to use them for accurate determination of ozone trends in the stratosphere and troposphere. A major purpose of the study was to validate the quality of the data including quantification of the errors and to determine if there were any limitations in altitude or latitude. The report is divided into three main chapters. Chapter 1 contains a description of how the various instruments work, and how ozone concentrations are calculated from the raw measurement. Particular attention is paid to the true vertical resolution of each instrument’s measurement and to its long term calibration drift as well as to its precision and accuracy. Chapter 2 assesses how well the various measurements agree through a series of rigorous data comparisons. Traditional techniques based on zonal averages and on close matches in time and space are augmented by new techniques which classify the air mass according to its dynamic history. Chapter 3 discusses and uses the various methods available for calculating trends, as well as investigating how well the causes of the trends can be determined by statistical approaches.
    Pages: Online-Ressource (288 Seiten)
    URL: http://www.sparc-climate.org/publications/sparc-reports/sparc-report-no1/
    Language: English
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Upper Limit of Iodine Oxide in the Lower Stratosphere (1998)
    Springer
    Journal of atmospheric chemistry 30 (1998), S. 173-185 
    Details
    ISSN: 1573-0662
    Keywords: stratosphere ; ozone ; iodine ; visible spectroscopy ; balloon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract It has been suggested that iodine oxides, IOx, could play a significant role in the ozone destruction in the lower stratosphere. To investigate this suggestion, spectra from nine SAOZ uv-visible spectrometer balloon flights were examined for the IO absorption signature between 405 and 450 nm. IO was not detected, either at mid- or high latitude, in the morning or the evening, in summer or winter. An upper limit of 0.2 parts per trillion by volume (pptv) at 20 km and 0.1 pptv at 15 km at the 95% confidence level (2σ), was derived from the best measurements at 90° SZA at sunset and sunrise. Since a photochemical model shows that 70% of inorganic iodine should be in the form IO at that time, it is concluded that unless iodine chemistry is different from that assumed at the moment, the role of iodine in stratospheric ozone depletion is small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006071612477
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