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    Angular distribution models, anisotropic correction factors, and mixed clear-scene types: A sensitivity study

    Authors
    Bertrand, C.
    Clerbaux, N.
    Ipe, A.
    Dewitte, S.
    Gonzalez, L.
    Show allShow less
    Discipline
    Earth and related Environmental sciences
    Subject
    atmospheric techniques
    Microwave measurement
    radiative transfer
    radiometry
    remote sensing
    sunldightAdd-drop multiplexers
    Anisotropic magnetoresistance
    Atmosphere
    Atmospheric measurements
    Atmospheric modeling
    Clouds
    Earth
    Layout
    Radiometers
    Satellite broadcasting
    Audience
    General Public
    Scientific
    Date
    2005
    Publisher
    IRM
    KMI
    RMI
    Metadata
    Show full item record
    Description
    Because radiometers do not measure the earth's outgoing flux directly, angular distribution models (ADMs) are used to invert measured radiances at the top of atmosphere (TOA) to flux. However, data used to build ADMs are generally not sorted for mixed scene types, and anisotropic correction factors for such scenes are not usually available. In the present study, we have analyzed shortwave (SW) flux values retrieved over nine areas representative of a junction between two different ADM scene types in the Meteosat-7 field of view. The Clouds and the Earth's Radiant Energy System (CERES) broadband SW ADMs were used to perform the radiance-to-flux conversion. Because of the large anisotropy difference that can exist between ADMs, use of the ADM that corresponds to the scene type with the highest percent coverage over footprints containing a mixture of scene types generates instantaneous as well as systematic errors in the retrieved SW flux values. Nevertheless, in the absence of available mixed scene type ADMs, we show that the CERES on the Tropical Rainfall Measuring Mission satellite SW ADMs can be combined together to provide reliable mixed scene types anisotropic correction factors. The use of such anisotropic factors appears to be especially well suited along the coastline of continents.
    Citation
    Bertrand, C.; Clerbaux, N.; Ipe, A.; Dewitte, S.; Gonzalez, L. (2005). Angular distribution models, anisotropic correction factors, and mixed clear-scene types: A sensitivity study. , Issue IEEE Transactions on geoscience and remote sensing, Vol.43, no 1, pp. 92-102, IRM,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/8677
    Type
    Article
    Peer-Review
    Not pertinent
    Language
    eng
    Links
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