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13 September 2011 Longwave infrared sensitivity of the clouds and Earth's radiant energy system (CERES) instrument sensors
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The Clouds and Earth's Radiant Energy System (CERES) mission currently employs four instruments onboard two spacecraft to measure the earth's reflected shortwave energy and the earth emitted thermal energy that represents two components of the earth's energy budget. These measurements are made through three sensors that measure different spectral channels- a shortwave channel that measures the 0.3 to 5 microns wavelength band, a total channel that measures all the incident energy (0.3 to ~200 microns) and a window channel that measures the 8 to 12 micron wavelength band. The radiances measured in each channel (filtered radiances) are used to estimate the incident (unfiltered) shortwave and longwave radiances using knowledge of the response functions of each of the measurement channels as well as theoretical knowledge of the energy spectrum of the earth scene being measured. For longer wavelengths particularly in the far infrared, both the earth scene spectra as well as the instrument spectral response functions are not very well characterized because of the difficulties in obtaining models for the earth scene spectra as well as the limitations in the capabilities to measure the spectral responses over a very large spectral range. This results in errors in obtaining estimates of the unfiltered radiances. This paper will focus on studying the sensitivity of the CERES instrument to these inaccuracies and its impact on the errors in estimation. In addition, those spectral regions in the longwave infrared where the CERES instruments are most sensitive will be identified.
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Mohan Shankar, Susan Thomas, and Kory Priestley "Longwave infrared sensitivity of the clouds and Earth's radiant energy system (CERES) instrument sensors", Proc. SPIE 8153, Earth Observing Systems XVI, 815315 (13 September 2011);

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