Global Space-based Inter-Calibration System (GSICS) is a critical space component of Global
Earth Observation System of Systems (GEOSS) that provided users with high-quality inter-calibrated
satellite measurements. As part of the GSICS, imaging instruments on geostationary (GEO) satellites have
been inter-calibrated with hyperspectral instrument Atmospheric Infrared Sounder (AIRS) and Infrared
Atmospheric Sounding Interferometer (IASI) on Low Earth Orbit (LEO) satellites. This paper reports the
GSICS GEO-LEO inter-calibration at NOAA/NESDIS, for GOES-11/12 with AIRS (since January 2007)
and IASI (since June 2007), and of METEOSAT-7/8/9, MTSAT-1R, and FY-2C with AIRS and IASI since
August 2008. Major components of the operation are reviewed, including algorithm development, data
processing, product generation, results dissemination, and selected inter-calibration examples. The
preliminary results of the GSICS correction show that the fully functioning GSICS is a powerful tool to
monitor instrument performance, to correct sensor bias, and to diagnose the root cause of calibration
anomalies.
The advent of hyperspectral sounders, such as the Atmospheric Infrared Sounder (AIRS) and the Infrared Atmospheric Sounding Interferometer (IASI), makes it possible for us to independently assess the radiance measurements of GOES Infrared (IR) imagers, which also provide an effective way to evaluate the GOES IR on-board calibration. In this study, we demonstrate the utility of the AIRS and IASI radiances to evaluate the GOES-11 IR channel measurements. We use the AIRS and IASI measurements to inter-calibrate the IR channels on GOES-11. The collocated GOES pixels inside each AIRS (IASI) pixel are averaged spatially. Then the spatially-averaged radiance from GOES IR channels are compared to AIRS (IASI) observations by convolving the AIRS (IASI) measured spectra with the GOES imager spectral response functions. This study demonstrates that the high-spectral resolution radiance measurements can serve as a
relative reference for the inter-calibration of operational GOES imagers for the Global Space-based Inter-Calibration System (GSICS).
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