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15 October 2012 Relative trends of AIRS and IASI radiometric calibrations
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This study examines relative trends in the radiometric calibrations of AIRS and IASI. The stability of the AIRS calibration in window channels over tropical oceans has been shown to be 5 mK/yr or better using 9 years of data. IASI data have been available for five years, and during IASI’s time in operation there have been significant El Niño and La Niña events. Those events introduce uncertainty into trend determinations that are more significant for IASI because of its shorter time in operation. When IASI and AIRS are directly compared in a double difference, the El Niño / La Niña effects cancel, allowing for an improved measurement of any instrumental trends in IASI over what can be done using IASI data alone. We find no significant relative trend between the two instruments. We do, however, find some data incompleteness effects for IASI that could introduce spurious trends over certain areas if ignored.
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Denis A. Elliott and Hartmut H. Aumann "Relative trends of AIRS and IASI radiometric calibrations", Proc. SPIE 8510, Earth Observing Systems XVII, 85100S (15 October 2012);

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