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    Zernike polynomials applied to apparent solar disk flattening for pressure profile retrievals

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    Authors
    Dekemper, E.
    Vanhellemont, F.
    Mateshvili, N.
    Franssens, G.
    Pieroux, D.
    Bingen, C.
    Robert, C.
    Fussen, D.
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    Discipline
    Earth and related Environmental sciences
    Subject
    algorithm
    atmospheric dynamics
    atmospheric modeling
    atmospheric pressure
    data inversion
    data set
    error analysis
    mesosphere
    numerical method
    pressure gradient
    refraction
    solar activity
    Audience
    Scientific
    Date
    2013
    Metadata
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    Description
    We present a passive method for the retrieval of atmospheric pressure profiles based on the measurement of the apparent flattening of the solar disk as observed through the atmosphere by a spaceborne imager. This method was applied to simulated sunsets. It relies on accurate representation of the solar disk, including its limb darkening, and how its image is affected by atmospheric refraction. The Zernike polynomials are used to quantify the flattening in the Sun images. The inversion algorithm relies on a transfer matrix providing the link between the atmospheric pressure profile and a sequence of Zernike moments computed on the sunset frames. The transfer matrix is determined by a training dataset of pressure profiles generated from a standard climatology. The performance and limitations of the method are assessed by two test cases. Pressure profiles similar to the training dataset show that retrieval error can be up to 10 times smaller than the natural variability in the lower mesosphere, and up to 500 times smaller in the upper troposphere. Tests with other independent profiles emphasize the need for better representativeness of the training dataset.
    Citation
    Dekemper, E.; Vanhellemont, F.; Mateshvili, N.; Franssens, G.; Pieroux, D.; Bingen, C.; Robert, C.; Fussen, D. (2013). Zernike polynomials applied to apparent solar disk flattening for pressure profile retrievals. , Atmospheric Measurement Techniques, Vol. 6, Issue 3, 823-835, DOI: 10.5194/amt-6-823-2013.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2891
    doi: http://dx.doi.org/10.5194/amt-6-823-2013
    scopus: 2-s2.0-84882747650
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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