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    Global observations of tropospheric BrO columns using GOME-2 satellite data

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    Authors
    Theys, N.
    Van Roozendael, M.
    Hendrick, F.
    Yang, X.
    De Smedt, I.
    Richter, A.
    Begoin, M.
    Errera, Q.
    Johnston, P.V.
    Kreher, K.
    De Maziere, M.
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    Discipline
    Earth and related Environmental sciences
    Subject
    aerosol
    atmospheric chemistry
    atmospheric plume
    bromine
    computer simulation
    global perspective
    GOME
    ground-based measurement
    ion
    numerical model
    observational method
    polar region
    quantitative analysis
    SCIAMACHY
    sea salt
    stratosphere
    tropopause
    troposphere
    Audience
    Scientific
    Date
    2011
    Metadata
    Show full item record
    Description
    Measurements from the GOME-2 satellite instrument have been analyzed for tropospheric BrO using a residual technique that combines measured BrO columns and estimates of the stratospheric BrO content from a climatological approach driven by O3 and NO2 observations. Comparisons between the GOME-2 results and BrO vertical columns derived from correlative ground-based and SCIAMACHY nadir observations, present a good level of consistency. We show that the adopted technique enables separation of stratospheric and tropospheric fractions of the measured total BrO columns and allows quantitative study of the BrO plumes in polar regions. While some satellite observed plumes of enhanced BrO can be explained by stratospheric descending air, we show that most BrO hotspots are of tropospheric origin, although they are often associated to regions with low tropopause heights as well. Elaborating on simulations using the p-TOMCAT tropospheric chemical transport model, this result is found to be consistent with the mechanism of bromine release through sea salt aerosols production during blowing snow events. No definitive conclusion can be drawn however on the importance of blowing snow sources in comparison to other bromine release mechanisms. Outside polar regions, evidence is provided for a global tropospheric BrO background with column of 1–3 × 1013 molec cm−2, consistent with previous estimates.
    Citation
    Theys, N.; Van Roozendael, M.; Hendrick, F.; Yang, X.; De Smedt, I.; Richter, A.; Begoin, M.; Errera, Q.; Johnston, P.V.; Kreher, K.; De Maziere, M. (2011). Global observations of tropospheric BrO columns using GOME-2 satellite data. , Atmospheric Chemistry and Physics, Vol. 11, Issue 4, 1791-1811, DOI: 10.5194/acp-11-1791-2011.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/3131
    doi: http://dx.doi.org/10.5194/acp-11-1791-2011
    scopus: 2-s2.0-79952080505
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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