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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Evaluation of ISCCP Multisatellite Radiance Calibration for Geostationary Imager Visible Channels Using the Moon
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Evaluation of ISCCP Multisatellite Radiance Calibration for Geostationary Imager Visible Channels Using the Moon

机译：利用月球对静止卫星成像器可见通道的ISCCP多卫星辐射定标的评估

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Since 1983, the International Satellite Cloud Climatology Project (ISCCP) has collected Earth radiance data from the succession of geostationary and polar-orbiting meteorological satellites operated by weather agencies worldwide. Meeting the ISCCP goals of global coverage and decade-length time scales requires consistent and stable calibration of the participating satellites. For the geostationary imager visible channels, ISCCP calibration provides regular periodic updates from regressions of radiances measured from coincident and collocated observations taken by Advanced Very High Resolution Radiometer instruments. As an independent check of the temporal stability and intersatellite consistency of ISCCP calibrations, we have applied lunar calibration techniques to geostationary imager visible channels using images of the Moon found in the ISCCP data archive. Lunar calibration enables using the reflected light from the Moon as a stable and consistent radiometric reference. Although the technique has general applicability, limitations of the archived image data have restricted the current study to Geostationary Operational Environmental Satellite and Geostationary Meteorological Satellite series. The results of this lunar analysis confirm that ISCCP calibration exhibits negligible temporal trends in sensor response but have revealed apparent relative biases between the satellites at various levels. However, these biases amount to differences of only a few percent in measured absolute reflectances. Since the lunar analysis examines only the lower end of the radiance range, the results suggest that the ISCCP calibration regression approach does not precisely determine the intercept or the zero-radiance response level. We discuss the impact of these findings on the development of consistent calibration for multisatellite global data sets.
机译：自1983年以来，国际卫星云气候学项目（ISCCP）从全球气象机构运行的一系列对地静止和极轨气象卫星中收集了地球辐射数据。要达到ISCCP的全球覆盖范围和十年长度的时标，就需要对参与的卫星进行一致且稳定的校准。对于地球静止成像仪的可见通道，ISCCP校准会定期提供定期定期更新，这些更新是根据由超高分辨率高分辨率辐射计仪器进行的同时观测和并置观测所测得的辐射回归得出的。作为对ISCCP校准的时间稳定性和卫星间一致性的独立检查，我们使用了在ISCCP数据档案中找到的月球图像，将月球校准技术应用于对地静止成像仪的可见通道。月球校准可将来自月球的反射光用作稳定且一致的辐射参考。尽管该技术具有普遍适用性，但存档图像数据的局限性将当前的研究限于对地静止业务环境卫星和地球静止气象卫星系列。这项月球分析的结果证实，ISCCP校准在传感器响应方面表现出可忽略的时间趋势，但已揭示出卫星在不同水平上的明显相对偏差。但是，这些偏差导致绝对反射率的测量值仅相差几个百分点。由于月球分析仅检查辐射范围的下限，因此结果表明，ISCCP校准回归方法无法精确确定截距或零辐射响应水平。我们讨论了这些发现对多卫星全球数据集一致性校准发展的影响。

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