A Time-Varying Radiometric Bias Correction for the TRMM Microwave Imager

    Authors

    K. Gopalan; W. L. Jones; S. Biswas; S. Bilanow; T. Wilheit;T. Kasparis

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Geosci. Remote Sensing

    Keywords

    Intersatellite radiometric calibration; microwave radiometer; special; sensor microwave imager (SSMI); Tropical Rainfall Measurement Mission; Microwave Imager (TMI); WindSat; WATER; SURFACE; MODEL; Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote; Sensing; Imaging Science & Photographic Technology

    Abstract

    Recent intersatellite radiometric comparisons of the Tropical Rainfall MeasurementMission Microwave Imager (TMI) with polar orbiting satellite radiometer data and modeled clear-sky radiances have uncovered a time-variable radiometric bias in the TMI brightness temperatures. The bias is consistent with a source that generally cools during orbit night and warms during sunlight exposure. The likely primary source has been identified as a slightly emissive parabolic antenna reflector. This paper presents an empirical brightness temperature correction to TMI based on the position around each orbit and the Sun elevation above the orbit plane. The results of radiometric intercomparisons with WindSat and special sensor microwave imager are presented, which demonstrate the effectiveness of the recommended correction approach based on four years of data.

    Journal Title

    Ieee Transactions on Geoscience and Remote Sensing

    Volume

    47

    Issue/Number

    11

    Publication Date

    1-1-2009

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    3722

    Last Page

    3730

    WOS Identifier

    WOS:000271140400014

    ISSN

    0196-2892

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