AIRS radiance validation over ocean from sea surface temperature measurements

Demonstrates the accuracy of methods and in situ data for early validation of calibrated Earth scene radiances measured by the Atmospheric InfraRed Sounder (AIRS) on the Aqua spacecraft. We describe an approach for validation that relies on comparisons of AIRS radiances with drifting buoy measuremen...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2003-02, Vol.41 (2), p.432-441
Main Authors: Hagan, D.E., Minnett, P.J.
Format: Article
Language:English
Subjects:
AQUA spacecraft
Atmospheric infrared sounder
Atmospheric measurements
Brightness temperature
Calibration
Channels
Earth
Equivalence
Layout
Marine vehicles
Meteorological satellites
Meteorology
Ocean temperature
Radiance
Sea measurements
Sea surface
Sea surface temperature
Space vehicles
Temperature
Temperature measurement
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Summary:Demonstrates the accuracy of methods and in situ data for early validation of calibrated Earth scene radiances measured by the Atmospheric InfraRed Sounder (AIRS) on the Aqua spacecraft. We describe an approach for validation that relies on comparisons of AIRS radiances with drifting buoy measurements, ship radiometric observations and mapped sea surface temperature products during the first six months after launch. The focus of the validation is on AIRS channel radiances in narrow spectral window regions located between 800-1250 cm/sup -1/ and between 2500 and 2700 cm/sup -1/. Simulated AIRS brightness temperatures are compared to in situ and satellite-based observations of sea surface temperature colocated in time and space, to demonstrate accuracies that can be achieved in clear atmospheres. An error budget, derived from single channel, single footprint matchups, indicates AIRS can be validated to better than 1% in absolute radiance (equivalent to 0.5 K in brightness temperature, at 300 K and 938 cm/sup -1/) during early mission operations. The eventual goal is to validate instrument radiances close to the demonstrated prelaunch calibration accuracy of about 0.4% (equivalent to 0.2 K in brightness temperature, at 300 K and 938 cm/sup -1/).
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2002.808316