17 October 2007 The slow mode of the CERES scanning radiometers
Author Affiliations +
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Z. Peter Szewczyk, Z. Peter Szewczyk, G. Louis Smith, G. Louis Smith, Kory J. Priestley, Kory J. Priestley, } "The slow mode of the CERES scanning radiometers", Proc. SPIE 6745, Remote Sensing of Clouds and the Atmosphere XII, 674514 (17 October 2007); doi: 10.1117/12.737954; https://doi.org/10.1117/12.737954

Back to Top