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    Assessing cloud spatial and vertical distribution with Cloud Infrared Radiometer CIR-7

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    Genkova(2004a).pdf (371.0Kb)
    Authors
    Genkova, I.
    Long, C.
    Besnard, T.
    Gillotay, D.
    Show allShow less
    Discipline
    Physical sciences
    Subject
    Algorithms
    Clouds
    Image sensors
    Infrared devices
    Interferometers
    Precipitation (meteorology)
    Remote sensing
    Satellites
    Sensors
    Cloud amount
    Cloud map
    Ground-based retrieval techniques
    Vertical cloud distribution
    Radiometers
    Audience
    Scientific
    Date
    2004
    Metadata
    Show full item record
    Description
    Recently developed, the Cloud Infrared Radiometer CIR-7, operates 7 infrared sensors, each with a 6-degree field of view, and spectral range 8-14 μm. The sensors are mounted on a semi-circular band at angles 0, 12, 24, 36, 48, 60 and 72°. A "hemisphericalα mosaic of 181 brightness temperature measurements centered on the zenith is obtained by the rotation of the band around the vertical axis, performing 30 scans, every 12° from 0α (North) to 348α. We present an algorithm that utilizes the brightness temperatures from the CIR-7 given the precipitable water vapor amounts and vertical profiles of the thermodynamic state of the atmosphere from independent measurements. It estimates the total cloud amount, the amount of low, middle and high clouds, maps out the spatial distribution of the cloud field and determines the vertical distribution of the clouds by computing cloud base heights. The algorithm is validated through comparisons with well studied ground-based and satellite retrieval techniques. Initial analyses show good cloud amount assessment and spatial mapping abilities. The estimated mean absolute cloud amount difference for day time is 12.3% when compared to the amount of opaque clouds derived with a total sky imager (TSI). For night time, this difference is 19.4% comparing to the effective cloud fraction derived with an atmospheric emitted radiance interferometer (AERI). The vertical distribution understanding is currently limited; however, the amounts of low, middle and high clouds could be determined and studied further.
    Citation
    Genkova, I.; Long, C.; Besnard, T.; Gillotay, D. (2004). Assessing cloud spatial and vertical distribution with Cloud Infrared Radiometer CIR-7. (Comeron, A., Ed.), Proceedings of SPIE 5571, Remote Sensing of Clouds and the Atmosphere IX, Vol. 5571, A1, DOI: 10.1117/12.564234.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/5080
    doi: http://dx.doi.org/10.1117/12.564234
    scopus: 2-s2.0-15944404270
    Type
    Conference
    Peer-Review
    No
    Language
    eng
    Links
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