Validation protocol for climate quality CERES measurements

Kory J. Priestley; G. Louis Smith; Susan Thomas; Grant Matthews

doi:10.1117/12.735312

6 October 2007 Validation protocol for climate quality CERES measurements

Kory J. Priestley, G. Louis Smith, Susan Thomas, Grant Matthews

Proceedings Volume 6678, Infrared Spaceborne Remote Sensing and Instrumentation XV; 66781I (2007) https://doi.org/10.1117/12.735312
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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%

Citation Download Citation

Kory J. Priestley, G. Louis Smith, Susan Thomas, and Grant Matthews "Validation protocol for climate quality CERES measurements", Proc. SPIE 6678, Infrared Spaceborne Remote Sensing and Instrumentation XV, 66781I (6 October 2007); https://doi.org/10.1117/12.735312

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