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    Case study of a tropopause fold and of subsequent mixing in the subtropics of the Southern Hemisphere

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    Gouget(2000a).pdf (342.7Kb)
    Authors
    Gouget, H.
    Discipline
    Physical sciences
    Subject
    Atmospheric chemistry
    Atmospheric composition
    Atmospheric humidity
    Atmospheric movements
    Atmospheric temperature
    Carbon monoxide
    Methane
    Ozone
    Tropics
    Troposphere
    Upper atmosphere
    Vortex flow
    Equivalent potential temperature
    Stratosphere-troposphere exchanges (STE)
    Tropopause
    Air pollution
    ozone
    atmospheric dynamics
    fold
    mixing
    Southern Hemisphere
    subtropical region
    tropopause
    Argentina
    article
    humidity
    meteorology
    ozone layer
    priority journal
    stratosphere
    temperature
    troposphere
    Audience
    Scientific
    Date
    2000
    Metadata
    Show full item record
    Description
    Aircraft measurements of ozone, methane, carbon monoxide, relative humidity and equivalent potential temperature were performed during the TROPOZ II campaign. During the descent down to Buenos Aires (34°S, 58°W) at 19:00 UTC on 22 January 1991, a double-peaked layer of elevated ozone was observed. Both a physico-chemical interpretation of each peak and diagnoses based on potential vorticity and ageostrophic circulations indicate the stratospheric origin of the ozone maxima. The relative minimum of ozone and significant increase of relative humidity present in the shallow layer between the peaks, in a region of wind shear, is identified as the signature of real mixing. This intermediate layer shows that ozone originating in the stratosphere was subsequently mixed into the troposphere by folding processes associated with the jet. This result suggests the relative importance of stratosphere-troposphere exchanges to the ozone budget in the Southern Hemisphere, due to a lesser extent of anthropogenic sources in this hemisphere. Copyright (C) 2000 Elsevier Science B.V.Aircraft measurements of ozone, methane, carbon monoxide, relative humidity and equivalent potential temperature were performed during the TROPOZ II campaign. During the descent down to Buenos Aires (34°S, 58°W) at 19:00 UTC on 22 January 1991, a double-peaked layer of elevated ozone was observed. Both a physico-chemical interpretation of each peak and diagnoses based on potential vorticity and ageostrophic circulations indicate the stratospheric origin of the ozone maxima. The relative minimum of ozone and significant increase of relative humidity present in the shallow layer between the peaks, in a region of wind shear, is identified as the signature of real mixing. This intermediate layer shows that ozone originating in the stratosphere was subsequently mixed into the troposphere by folding processes associated with the jet. This result suggests the relative importance of stratosphere-troposphere exchanges to the ozone budget in the Southern Hemisphere, due to a lesser extent of anthropogenic sources in this hemisphere.
    Citation
    Gouget, H. (2000). Case study of a tropopause fold and of subsequent mixing in the subtropics of the Southern Hemisphere. , Atmospheric Environment, Vol. 34, Issue 16, 2653-2658, DOI: 10.1016/S1352-2310(99)00508-7.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/5335
    doi: http://dx.doi.org/10.1016/S1352-2310(99)00508-7
    scopus: 2-s2.0-0034079172
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

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