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Proceedings Paper

On-orbit radiometric calibrations of the Earth Radiation Budget Experiment (ERBE) active-cavity radiometers on the Earth Radiation Budget Satellite (ERBS)
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Paper Abstract

Between November 1984 and July 2002, the Earth Radiation Budget Satellite (ERBS)/Earth Radiation Budget Experiment (ERBE) nonscanning, active cavity radiometers (ACR) were used to measure incoming total solar irradiance, earth-reflected solar irradiance, and earth-emitted outgoing longwave radiation (OLR) irradiance. The ERBE shortwave wide field-of view (SWFOV) and toal wide field-of-view (TWFOV) ACR's measured irradiances from the entire earth disc in the shortwave (0.2-5.0 μm) and total (0.2-100 μm) broadband spectral regions. On-orbit, the ACR's observations of the incoming total solar irradiance, and of reference irradiance from on-board tungsten lamp and blackbodies were used to determine drifts and shifts in the ACR responses/gains. In the cases of the SWFOV ACR, its response/gain changed as much as 8.8% while the TWFOV response was stable at levels better than 0.1%. The precise measurements of gain and offset variations have permitted the generations of ERBE level 1 data products [earth-reflected solar (≈240 Wm-2)and earth-emitted (≈100 Wm-2) irradiances] at the precision levels better than 0.3 Wm-2. In this paper, the ACR radiometric on-orbit calibration approaches and systems are outlined.

Paper Details

Date Published: 24 September 2002
PDF: 11 pages
Proc. SPIE 4814, Earth Observing Systems VII, (24 September 2002); doi: 10.1117/12.451614
Show Author Affiliations
Robert Benjamin Lee, NASA Langley Research Ctr. (United States)
Jack Paden, Science Applications International Corp. (United States)
Dhirendra K. Pandey, Science Applications International Corp. (United States)
Robert S. Wilson, Science Applications International Corp. (United States)
Kathryn A. Bush, Science Applications International Corp. (United States)
G. Louis Smith, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 4814:
Earth Observing Systems VII
William L. Barnes, Editor(s)

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