Determination of wavelength-dependent spectral darkening occurring on a broadband Earth observing radiometer: application to clouds and the Earth's radiant energy system (CERES)

Grant Matthews; Kory Priestley; Norman G. Loeb; Konstantin Loukachine; Susan Thomas; Dale Walikainen; Bruce A. Wielicki

doi:10.1117/12.687921

3 October 2006 Determination of wavelength-dependent spectral darkening occurring on a broadband Earth observing radiometer: application to clouds and the Earth's radiant energy system (CERES)

Grant Matthews, Kory Priestley, Norman G. Loeb, Konstantin Loukachine, Susan Thomas, Dale Walikainen, Bruce A. Wielicki

Author Affiliations +

Proceedings Volume 6361, Sensors, Systems, and Next-Generation Satellites X; 63610Y (2006) https://doi.org/10.1117/12.687921
Event: SPIE Remote Sensing, 2006, Stockholm, Sweden

Abstract

It is estimated that in order to best detect real changes in the Earth's climate system, space based instrumentation measuring the Earth Radiation Budget (ERB) needs to remain calibrated with a stability of 0.3% per decade. This stability is beyond the specification of existing ERB programs such as the Clouds and the Earth's Radiant Energy System (CERES, using three broadband radiometric scanning channels: the shortwave 0.3 - 5μm, total 0.3- > 100μm, and window 8 - 12μm). It is known that when in low earth orbit, optical response to blue/UV radiance can be reduced significantly due to UV hardened contaminants deposited on the surface of the optics. Typical onboard calibration lamps do not emit sufficient energy in the blue/UV region, hence this darkening is not directly measurable using standard internal calibration techniques. This paper details a study using a model of contaminant deposition and darkening, in conjunction with in-flight vicarious calibration techniques, to derive the spectral shape of darkening to which a broadband instrument is subjected. The model ultimately uses the reflectivity of Deep Convective Clouds as a stability metric. The results of the model when applied to the CERES instruments on board the EOS Terra satellite are shown. Given comprehensive validation of the model, these results will allow the CERES spectral responses to be updated accordingly prior to any forthcoming data release in an attempt to reach the optimum stability target that the climate community requires.

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Grant Matthews, Kory Priestley, Norman G. Loeb, Konstantin Loukachine, Susan Thomas, Dale Walikainen, and Bruce A. Wielicki "Determination of wavelength-dependent spectral darkening occurring on a broadband Earth observing radiometer: application to clouds and the Earth's radiant energy system (CERES)", Proc. SPIE 6361, Sensors, Systems, and Next-Generation Satellites X, 63610Y (3 October 2006); https://doi.org/10.1117/12.687921

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KEYWORDS

Calibration

Clouds

Instrument modeling

Molecules

Polymers

Carbon monoxide

Data modeling

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