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Proceedings Paper

The slow mode of the CERES scanning radiometers
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Paper Abstract

Clouds and the Earth's Radiant Energy System (CERES) instrument uses scanning radiometers on board the Terra and Aqua satellites use thermistor bolometers as detectors, with a sampling rate of 0.01s. During calibration testing a slow mode of detectors was found which had a magnitude of about three percent of the signal, and a characteristic time of 0.3 sec. To reduce the effect of this mode, a numerical filter was introduced. However, an analysis of the data from the CERES instruments aboard the Terra and Aqua satellites shows a difference of radiances in the forward scan compared to radiances from the backward scan. This difference is due to the slow mode not being characterized correctly. A focus of this work is to show results of setting slow mode filter parameters based on in-flight data. A gradient-based minimization strategy is employed to effectively find the filter parameters for each instrument to meet the performance goal of 0.15%. The newly designed numerical filters are to be used in processing the Edition 3 of CERES ERBE-like data products.

Paper Details

Date Published: 17 October 2007
PDF: 9 pages
Proc. SPIE 6745, Remote Sensing of Clouds and the Atmosphere XII, 674514 (17 October 2007); doi: 10.1117/12.737954
Show Author Affiliations
Z. Peter Szewczyk, Science Applications International Corp. (United States)
G. Louis Smith, National Institute of Aerospace (United States)
Kory J. Priestley, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6745:
Remote Sensing of Clouds and the Atmosphere XII
Adolfo Comerón; Richard H. Picard; Klaus Schäfer; James R. Slusser; Aldo Amodeo, Editor(s)

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