1 September 1990 Accuracy of ERB measurements from the Clouds and the Earth's Radiant Energy System Instrument
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Abstract
In February 1989 NASA announced the projects it will fund for an eighteen month definition phase study as part of its planned Earth Observing System program. One of these projects was the " Clouds and the Earth''s Radiant Energy System Instrument" (CERES-I). The instrument is composed of two scanning components each very similar in design to the successful ERBE scanner. One operates continuously in the ERBE " cross-track" scan mode while the other rotates the scan plane through 180 degrees every 30 to 45 seconds. A computer simulation code for ERB measurement developed at NOAA/NESDIS has been used to evaluate the potential performance of the cross-track component of this instrument. Specifically we have estimated the error in ERB instantaneous flux measurements for five different CERES-I designs and for two different earth surface resolutions 1 and 2. 5degree latitude and longitude regions. This study is limited to the effects of spatial sampling errors by assuming that the Earth/atmosphere system reflects radiation isotropically. A subsequent study will treat the effects of angular sampling errors and evaluate the value of the rotating azimuth scanner in minimizing this error. To allow for a margin in meeting user requirements (RMS error 10 W*M2) it has been concluded that a triangular (bi-directional) scanner with a field-of-view of 1. 8 degrees (half the ERBE design) averaged into 2. 5 degree target areas is the preferred design (RMS error
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Larry L. Stowe, Larry L. Stowe, Peter Abel, Peter Abel, Herbert Jacobowitz, Herbert Jacobowitz, Philip E. Ardanuy, Philip E. Ardanuy, R. Hucek, R. Hucek, R. Joyce, R. Joyce, } "Accuracy of ERB measurements from the Clouds and the Earth's Radiant Energy System Instrument", Proc. SPIE 1299, Long-Term Monitoring of the Earth's Radiation Budget, (1 September 1990); doi: 10.1117/12.21370; https://doi.org/10.1117/12.21370
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