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  • Meteorology and Climatology  (2)
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  • 1
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    Observed and Modeled HOCl Profiles in the Midlatitude Stratosphere: Implication for Ozone Loss (2007)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: Vertical profiles of stratospheric HOCl calculated with a diurnal steady-state photochemical model that uses currently recommended reaction rates and photolysis cross sections underestimate observed profiles of HOCl obtained by two balloon-borne instruments, FIRS-2 (a far-infrared emission spectrometer) and MkIV (a mid-infrared, solar absorption spectrometer). Considerable uncertainty (a factor of two) persists in laboratory measurements of the rate constant (k(sub 1)) for the reaction ClO + HO2 yields HOCl + O2. Agreement between modeled and measured HOCl can be attained using a value of k(sub 1) from Stimpfle et al. (1979) that is about a factor-of-two faster than the currently recommended rate constant. Comparison of modeled and measured HOCl suggests that models using the currently recommended value for k(sub 1) may underestimate the role of the HOCl catalytic cycle for ozone depletion, important in the midlatitude lower stratosphere.
    Keywords: Meteorology and Climatology
    Type: Geophysical Research Letters (ISSN 0094-8276); Volume 34
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Sensitivity of Ozone to Bromine in the Lower Stratosphere (2005)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: Measurements of BrO suggest that inorganic bromine (Br(sub y)) at and above the tropopause is 4 to 8 ppt greater than assumed in models used in past ozone trend assessment studies. This additional bromine is likely carried to the stratosphere by short-lived biogenic compounds and their decomposition products, including tropospheric BrO. Including this additional bromine in an ozone trend simulation increases the computed ozone depletion over the past approx.25 years, leading to better agreement between measured and modeled ozone trends. This additional Br(sub y) (assumed constant over time) causes more ozone depletion because associated BrO provides a reaction partner for ClO, which increases due to anthropogenic sources. Enhanced Br(sub y) causes photochemical loss of ozone below approx.14 km to change from being controlled by HO(sub x) catalytic cycles (primarily HO2+O3) to a situation where loss by the BrO+HO2 cycle is also important.
    Keywords: Meteorology and Climatology
    Type: Geophysical Research Letters, 2005 (ISSN 0094-8276); Volume 32
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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