2 November 1993 Ice radiance method for backscatter UV instrument monitoring
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Proceedings Volume 2047, Atmospheric Ozone; (1993); doi: 10.1117/12.163469
Event: High Latitude Optics, 1993, Tromso, Norway
Abstract
The radiance of large, ice covered land masses has been used to monitor TOMS instrument sensitivities. Greenland and Antarctica provide uniform and stable ice surfaces whose average albedo appears to be constant within the desired accuracy for instrument monitoring. Instrument radiance response will depend upon view and illumination angles, the sun-earth distance, and atmospheric conditions. Restriction to nadir views eliminates view angle dependence, and corrections are made for sun-earth distance. The effect of atmospheric conditions, such as ozone and clouds, is minimized by monitoring at wavelengths above 340 nm and by the high surface radiance. Relative instrument response is determined by the ratio of signals measured at different times using a binning technique to account for differences in solar illumination angles. The only remaining limit to long term monitoring accuracy is the albedo stability of the ice surface itself. Changes in the Nimbus-7/TOMS instrument response at long wavelengths are monitored within 1% accuracy over the lifetime of the instrument.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Glen Jaross, Arlin J. Krueger, "Ice radiance method for backscatter UV instrument monitoring", Proc. SPIE 2047, Atmospheric Ozone, (2 November 1993); doi: 10.1117/12.163469; http://dx.doi.org/10.1117/12.163469
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KEYWORDS
Calibration

Ozone

Diffusers

Reflectivity

Atmospheric monitoring

Backscatter

Clouds

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