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    A new software suite for NO2 vertical profile retrieval from ground-based zenith-sky spectrometers

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    Denis(2005).pdf (247.1Kb)
    Authors
    Denis, L.
    Roscoe, H.K.
    Chipperfield, M.P.
    Van Roozendael, M.
    Goutail, F.
    Show allShow less
    Discipline
    Earth and related Environmental sciences
    Subject
    Climatology
    Computer software
    Error analysis
    Mathematical models
    Spectrometers
    Transfer functions
    Upper atmosphere
    Radiative transfer models
    Stratospheric circulations
    Twilight
    Zenith-sky spectrometers
    Nitrogen oxides
    instrumentation
    nitrogen oxides
    spectrometer
    vertical profile
    zenith angle
    Audience
    Scientific
    Date
    2005
    Metadata
    Show full item record
    Description
    Here we present an operational method to improve accuracy and information content of ground-based measurements of stratospheric NO2. The motive is to improve the investigation of trends in NO2, and is important because the current trend in NO2 appears to contradict the trend in its source, suggesting that the stratospheric circulation has changed. To do so, a new software package for retrieving NO2 vertical profiles from slant columns measured by zenith-sky spectrometers has been created. It uses a Rodgers optimal linear inverse method coupled with a radiative transfer model for calculations of transfer functions between profiles and columns, and a chemical box model for taking into account the NO2 variations during twilight and during the day. Each model has parameters that vary according to season and location. Forerunners of each model have been previously validated. The scheme maps random errors in the measurements and systematic errors in the models and their parameters on to the retrieved profiles. Initialisation for models is derived from well-established climatologies. The software has been tested by comparing retrieved profiles to simultaneous balloon-borne profiles at mid-latitudes in spring.
    Citation
    Denis, L.; Roscoe, H.K.; Chipperfield, M.P.; Van Roozendael, M.; Goutail, F. (2005). A new software suite for NO2 vertical profile retrieval from ground-based zenith-sky spectrometers. , Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 92, Issue 3, 321-333, DOI: 10.1016/j.jqsrt.2004.07.030.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4638
    doi: http://dx.doi.org/10.1016/j.jqsrt.2004.07.030
    scopus: 2-s2.0-11944275040
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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