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The Clouds and the Earth’s Radiant Energy System (CERES) project was designed to provide precise radiance measurements crucial to creating a seamless Earth Radiation Budget (ERB) Climate Data Record (CDR). CERES instruments currently operating on NASA’s Earth Observing System (EOS) Terra and Aqua, Suomi National Polar-Orbiting Partnership (S-NPP), and NOAA-20 platforms have provided more than two decades of continuous ERB data. To ensure that required accuracies are attained and calibration consistency is maintained, each CERES instrument is subjected to rigorous on-orbit calibration protocols and comprehensive validation procedures. Algorithm improvements and validation of CERES data products are described and presented. The approach to accounting for in-flight calibration changes are briefly described. Validation tools include intercomparison studies between the sensors of the different CERES instruments carried out by directly comparing observations using spatially and temporally matched measurements from sensors on different platforms at orbit cross-over regions. Additionally, tropical deep convective clouds (DCC), viewed by these Earth-observing satellites at all scan angles, and considered to be highly invariant Earth targets in some remote-sensing applications, are also used in evaluating data product consistency. Results from the Tropical Mean validation technique are also discussed. To facilitate this study, Level 2 data products that incorporate the most recent calibration algorithm improvements as well as improved cloud property algorithms and newest Angular Distribution models (ADMs) are used. Long-term trends in radiances and global fluxes show consistency among the instruments and no indication of changes or drifts in performance.
Topic : Theme 1: Earth Energy Balance.
Reference : T1-C19
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