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    Characterisation of vertical BrO distribution during events of enhanced tropospheric BrO in Antarctica, from combined remote and in-situ measurements

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    Roscoe(2014).pdf (2.084Mb)
    Authors
    Roscoe, H.K.
    Brough, N.
    Jones, A.E.
    Wittrock, F.
    Richter, A.
    Van Roozendael, M.
    Hendrick, F.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Discrepancy
    Halogens
    Ozone
    Troposphere
    Audience
    Scientific
    Date
    2014
    Metadata
    Show full item record
    Description
    Tropospheric BrO was measured by a ground-based remote-sensing spectrometer at Halley in Antarctica in spring 2007, and BrO was measured by satellite-borne remote-sensing spectrometers using similar spectral regions and similar Differential Optical Absorption Spectroscopy (DOAS) analyses. Near-surface BrO was simultaneously measured in situ at Halley by Chemical Ionisation Mass Spectrometer (CIMS), and in an earlier year near-surface BrO was measured at Halley over a long path by a ground-based DOAS spectrometer. During enhancement episodes, total amounts of tropospheric BrO from the ground-based remote-sensor were similar to those from space, but if we assume that the BrO was confined to the mixed layer they were very much larger than values measured by either near-surface technique. This large apparent discrepancy can be resolved if substantial amounts of BrO were in the free troposphere during most enhancement episodes. Amounts observed by the ground-based remote sensor at different elevation angles, and their formal inversions to vertical profiles, demonstrate that much of the BrO was indeed often in the free troposphere. This is consistent with the ~5 day lifetime of Bry and with the enhanced BrO observed during some Antarctic blizzards.
    Citation
    Roscoe, H.K.; Brough, N.; Jones, A.E.; Wittrock, F.; Richter, A.; Van Roozendael, M.; Hendrick, F. (2014). Characterisation of vertical BrO distribution during events of enhanced tropospheric BrO in Antarctica, from combined remote and in-situ measurements. , Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 138, 70-81, DOI: 10.1016/j.jqsrt.2014.01.026.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2820
    doi: http://dx.doi.org/10.1016/j.jqsrt.2014.01.026
    scopus: 2-s2.0-84894470265
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

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