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    The effectiveness of N2O in depleting stratospheric ozone

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    Author
    Revell LE
    Bodeker GE
    Smale D
    Lehmann R
    Huck PE
    Williamson BE
    Rozanov E
    Struthers H
    Date
    2012
    Permanent Link
    http://hdl.handle.net/10092/15756

    Recently, it was shown that of the ozone-depleting substances currently emitted, N2O emissions (the primary source of stratospheric NOx dominate, and are likely to do so throughout the 21st century. To investigate the links between N2O and NOx concentrations, and the effects of NOx on ozone in a changing climate, the evolution of stratospheric ozone from 1960 to 2100 was simulated using the NIWA-SOCOL chemistry-climate model. The yield of NOx from N2O is reduced due to stratospheric cooling and a strengthening of the Brewer-Dobson circulation. After accounting for the reduced NOx yield, additional weakening of the primary NOx cycle is attributed to reduced availability of atomic oxygen, due to a) stratospheric cooling decreasing the atomic oxygen/ozone ratio, and b) enhanced rates of chlorine-catalyzed ozone loss cycles around 2000 and enhanced rates of HOx-induced ozone depletion. Our results suggest that the effects of N2O on ozone depend on both the radiative and chemical environment of the upper stratosphere, specifically CO2-induced cooling of the stratosphere and elevated CH4 4 emissions which enhance HOx -induced ozone loss and remove the availability of atomic oxygen to participate in NO x ozone loss cycles. © 2012. American Geophysical Union. All Rights Reserved.

    Subjects
    Science & Technology
     
    Physical Sciences
     
    Geosciences, Multidisciplinary
     
    Geology
     
    GEOSCIENCES, MULTIDISCIPLINARY
     
    MIDDLE ATMOSPHERE
     
    NITROUS-OXIDE
     
    GREENHOUSE GASES
     
    MODEL
     
    IMPACT
     
    TROPOSPHERE
     
    SIMULATION
     
    TRANSPORT
     
    METHANE
     
    TRENDS
     
    Field of Research::03 - Chemical Sciences::0399 - Other Chemical Sciences::039901 - Environmental Chemistry (incl. Atmospheric Chemistry)
     
    Field of Research::04 - Earth Sciences::0401 - Atmospheric Sciences::040104 - Climate Change Processes
    Collections
    • Science: Journal Articles [906]

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