• Login
     
    View Item 
    •   ORFEO Home
    • Royal Belgian Institute for Space Aeronomy
    • BIRA-IASB publications
    • View Item
    •   ORFEO Home
    • Royal Belgian Institute for Space Aeronomy
    • BIRA-IASB publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Response of the mesosphere to human-induced perturbations and solar variability calculated by a 2-D model

    Thumbnail
    View/Open
    Khosravi(2002a).pdf (765.5Kb)
    Authors
    Khosravi, R.
    Brasseur, G.
    Smith, A.
    Rusch, D.
    Walters, S.
    Chabrillat, S.
    Kockarts, G.
    Show allShow less
    Discipline
    Earth and related Environmental sciences
    Subject
    Atmospheric chemistry
    Atmospheric composition
    Carbon dioxide
    Computer simulation
    Greenhouse effect
    Ozone
    Solar radiation
    Ultraviolet radiation
    chemical composition
    greenhouse gas
    human activity
    mesosphere
    ozone
    perturbation
    timescale
    ultraviolet radiation
    Audience
    Scientific
    Date
    2002
    Metadata
    Show full item record
    Description
    We have used the improved NCAR interactive 2-D model (SOCRATES) to investigate the chemical and thermal response of the mesosphere to composition changes from the preindustrial era (∼1850) to the present, to doubling the CO2 concentration, and to the 11-year solar flux variability. The calculations show that all regions in the model mesosphere have cooled relative to the preindustrial times. The mesopause region has cooled by ∼5 K and the winter pole by up to 9 K near 60 km. Ozone mixing ratio has decreased by about 5% in the lower mesosphere and by about 30% near the summer mesopause region (caused by a dramatic increase in [OH]). Doubling the CO2 abundance cools the whole mesosphere by about 4-16 K and has a complicated effect on O3, which exhibits an alternating increase/decrease behavior from the lower mesosphere up to the mesopause region. Similar results are obtained, in both magnitude and structure, for the O3 response to a decrease in solar UV flux. Similarities are also found in the response of T, OH, and H to these two perturbations. These results lead to the conclusion that the long-term increase in the well-mixed greenhouse gases, in particular CO 2, alters the thermal structure and chemical composition of the mesosphere significantly and that these anthropogenic effects are of the same magnitude as the effects associated with the 11-year solar cycle. Thus, the difference in the timescales involved suggests that the anthropogenic signal over periods of typically 10 years is smaller than the signal generated by the 11-year solar variability. Finally, analysis of the results from a simulation of the combined perturbations (2 × CO2 + 11-year solar variability) shows that, for the most part, the solar variability does not interact with increasing CO2 and vice versa; that is, the two effects are additive.
    Citation
    Khosravi, R.; Brasseur, G.; Smith, A.; Rusch, D.; Walters, S.; Chabrillat, S.; Kockarts, G. (2002). Response of the mesosphere to human-induced perturbations and solar variability calculated by a 2-D model. , Journal of Geophysical Research: Atmospheres, Vol. 107, Issue 18, A4358, DOI: 10.1029/2001JD001235.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/5213
    doi: http://dx.doi.org/10.1029/2001JD001235
    scopus: 2-s2.0-33646500321
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

    Browse

    All of ORFEOCommunities & CollectionsBy Issue DateAuthorsTitlesDisciplinesThis CollectionBy Issue DateAuthorsTitlesDisciplines
     

    DSpace software copyright © 2002-2016  DuraSpace
    Send Feedback | Cookie Information
    Theme by 
    Atmire NV