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

Robert Benjamin Lee III; Jack Paden; Dhirendra K. Pandey; Robert S. Wilson; Kathryn A. Bush; G. Louis Smith

doi:10.1117/12.451614

24 September 2002 On-orbit radiometric calibrations of the Earth Radiation Budget Experiment (ERBE) active-cavity radiometers on the Earth Radiation Budget Satellite (ERBS)

Robert Benjamin Lee III, Jack Paden, Dhirendra K. Pandey, Robert S. Wilson, Kathryn A. Bush, G. Louis Smith

Author Affiliations +

Proceedings Volume 4814, Earth Observing Systems VII; (2002) https://doi.org/10.1117/12.451614
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

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Robert Benjamin Lee III, Jack Paden, Dhirendra K. Pandey, Robert S. Wilson, Kathryn A. Bush, and G. Louis Smith "On-orbit radiometric calibrations of the Earth Radiation Budget Experiment (ERBE) active-cavity radiometers on the Earth Radiation Budget Satellite (ERBS)", Proc. SPIE 4814, Earth Observing Systems VII, (24 September 2002); https://doi.org/10.1117/12.451614

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