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Proceedings Paper

Validation protocol for climate quality CERES measurements
Author(s): Kory J. Priestley; G. Louis Smith; Susan Thomas; Grant Matthews
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Paper Abstract

The CERES Flight Model-1 and -2 instruments flew aboard the Terra into orbit in December 1999 and the FM-3 and -4 instruments flew on the Aqua spacecraft in May 2002. To date these instruments have provided seven years of measurements on Terra and five years on Aqua. The accuracy requirement for CERES is 0.5% for longwave radiances and 1.0% for shortwave. Achieving this objective is possible by using experience from the ERBE instrument to evolve the CERES design and the methods for analyzing the data. In order to achieve and maintain this accuracy, an internal calibration system and an attenuated view of the Sun are used. Subsequently, to validate that this accuracy has been achieved, a number of techniques have been developed which cover a range of temporal and spatial scales. This ensemble of methods provides a protocol which assures that the CERES measurements are of climate quality. In addition to retrieving fluxes at the top of the atmosphere, the CERES program uses data from other instruments aboard the spacecraft to compute the radiation balance at the surface and at levels through the atmosphere. Finally, the CERES data products are upgraded as higher-level data products show the need for revisions. The calibration stability is better than 0.2% and traceability from ground to in-flight calibration is 0.25%

Paper Details

Date Published: 6 October 2007
PDF: 12 pages
Proc. SPIE 6678, Infrared Spaceborne Remote Sensing and Instrumentation XV, 66781I (6 October 2007); doi: 10.1117/12.735312
Show Author Affiliations
Kory J. Priestley, NASA Langley Research Ctr. (United States)
G. Louis Smith, National Institute for Aerospace (United States)
Susan Thomas, Science Systems and Applications, Inc. (United States)
Grant Matthews, Applied Science and Materials, Inc. (United States)

Published in SPIE Proceedings Vol. 6678:
Infrared Spaceborne Remote Sensing and Instrumentation XV
Marija Strojnik-Scholl, Editor(s)

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