From Event: SPIE Optical Engineering + Applications, 2016
The goal of the Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission is to provide high-accuracy data for evaluation of long-term climate change trends. Essential to the CLARREO project is demonstration of SI-traceable, reflected measurements that are a factor of 10 more accurate than current state-of-the-art sensors. The CLARREO approach relies on accurate, monochromatic absolute radiance calibration in the laboratory transferred to orbit via solar irradiance knowledge. The current work describes the results of field measurements with the Solar, Lunar for Absolute Reflectance Imaging Spectroradiometer (SOLARIS) that is the calibration demonstration system (CDS) for the reflected solar portion of CLARREO. Recent measurements of absolute spectral solar irradiance using SOLARIS are presented. The ground-based SOLARIS data are corrected to top-of-atmosphere values using AERONET data collected within 5 km of the SOLARIS operation. The SOLARIS data are converted to absolute irradiance using laboratory calibrations based on the Goddard Laser for Absolute Measurement of Radiance (GLAMR). Results are compared to accepted solar irradiance models to demonstrate accuracy values giving confidence in the error budget for the CLARREO reflectance retrieval.
Kurtis J. Thome, Joel McCorkel, and Amit Angal, "Demonstrating the error budget for the climate absolute radiance and refractivity observatory through solar irradiance measurements
(Conference Presentation)," Proc. SPIE 9972, Earth Observing Systems XXI, 997217 (Presented at SPIE Optical Engineering + Applications: September 01, 2016; Published: 18 November 2016); https://doi.org/10.1117/12.2238302.5178520088001.
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