Dr. Grant Matthews Profile

Dr. Grant Matthews

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Publications (12)

Proceedings Article | 20 August 2008 Paper

Radiometric performance of the CERES broadband radiometers on the Terra and Aqua spacecraft

Kory Priestley, G. Louis Smith, Susan Thomas, Grant Matthews, Z. Peter Szewczyk

Proceedings Volume 7081, 70811A (2008) https://doi.org/10.1117/12.797957

KEYWORDS: Shortwaves, Calibration, Space operations, Solar radiation, Radiometry, Space telescopes, Solids, Aerospace engineering, Clouds, Telescopes

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Proceedings Article | 6 October 2007 Paper

Validation protocol for climate quality CERES measurements

Kory Priestley, G. Louis Smith, Susan Thomas, Grant Matthews

Proceedings Volume 6678, 66781I (2007) https://doi.org/10.1117/12.735312

KEYWORDS: Shortwaves, Calibration, Clouds, Space operations, Climatology, Earth's atmosphere, Optical filters, Quality measurement, Instrument modeling, Sun

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Proceedings Article | 5 October 2007 Paper

Analysis of clouds and the Earth's radiant energy system (CERES) lunar measurements

Susan Thomas, K. Priestley, G. Matthews

Proceedings Volume 6677, 667715 (2007) https://doi.org/10.1117/12.735839

KEYWORDS: Sensors, Shortwaves, Clouds, Space operations, Phase measurement, Calibration, Aerospace engineering, Instrument modeling, Sensor performance, Analytical research

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Proceedings Article | 5 October 2007 Paper

Transfer of radiometric standards between multiple low earth orbit climate observing broadband radiometers: application to CERES

Grant Matthews, Kory Priestley, Susan Thomas

Proceedings Volume 6677, 66770I (2007) https://doi.org/10.1117/12.734478

KEYWORDS: Calibration, Contamination, Clouds, Radiometry, Climatology, Satellites, Radio optics, Telescopes, Black bodies, Ocean optics

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Proceedings Article | 26 September 2007 Paper

Spectral balancing of a broadband Earth observing radiometer with co-aligned short wave channel to ensure accuracy and stability of broadband daytime outgoing long-wave radiance measurements: application to CERES

Grant Matthews, Kory Priestley, Susan Thomas

Proceedings Volume 6678, 66781H (2007) https://doi.org/10.1117/12.734492

KEYWORDS: Calibration, Clouds, Channel projecting optics, Radiometry, Contamination, Solar energy, Ocean optics, Ultraviolet radiation, MODIS, Climatology

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Proceedings Article | 8 December 2006 Paper

Radiometric stability results of clouds and the Earth's radiant energy system (CERES) instrument sensors aboard EOS Terra and Aqua spacecraft

Susan Thomas, K. Priestley, R. Wilson, G. Matthews, D. Walikainen, D. Cooper, P. Hess

Proceedings Volume 6408, 640805 (2006) https://doi.org/10.1117/12.694077

KEYWORDS: Sensors, Shortwaves, Calibration, Space operations, Clouds, Sensor calibration, Black bodies, Diffusers, Lamps, Mirrors

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Proceedings Article | 3 October 2006 Paper

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 Loeb, Konstantin Loukachine, Susan Thomas, Dale Walikainen, Bruce Wielicki

Proceedings Volume 6361, 63610Y (2006) https://doi.org/10.1117/12.687921

KEYWORDS: Calibration, Clouds, Instrument modeling, Molecules, Polymers, Data modeling, Carbon monoxide, Radiometry, Ultraviolet radiation, Climatology

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Proceedings Article | 20 September 2006 Paper

Validation studies performed on Clouds and the Earth's Radiant Energy system (CERES) instrument sensors aboard EOS Terra and Aqua spacecraft

Susan Thomas, K. Priestley, R. Wilson, D. Walikainen, G. Matthews

Proceedings Volume 6296, 62960L (2006) https://doi.org/10.1117/12.681626

KEYWORDS: Sensors, Shortwaves, Calibration, Space operations, Clouds, Sensor calibration, Black bodies, Diffusers, Lamps, Mirrors

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Proceedings Article | 8 September 2006 Paper

Coloration determination of 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 Loeb, Konstantin Loukachine, Susan Thomas, Dale Walikainen, Bruce Wielicki

Proceedings Volume 6296, 62960M (2006) https://doi.org/10.1117/12.680884

KEYWORDS: Calibration, Clouds, Instrument modeling, Molecules, Polymers, Data modeling, Carbon monoxide, Radiometry, Ultraviolet radiation, Climatology

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Proceedings Article | 22 August 2005 Paper

Compensation for spectral darkening of short wave optics occurring on the cloud's and the Earth's radiant energy system

Grant Matthews, Kory Priestley, Peter Spence, Denise Cooper, Dale Walikainen

Proceedings Volume 5882, 588212 (2005) https://doi.org/10.1117/12.618972

KEYWORDS: Lamps, Climatology, Optical filters, Calibration, Satellites, Ultraviolet radiation, Clouds, Ocean optics, Sensors, Space telescopes

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Cloud's and the Earth's Radiant Energy System (CERES) is an investigation into the role of clouds and radiation in the Earth's climate system. Four CERES scanning thermistor bolometer instruments are currently in orbit. Flight model 1 (FM1) and 2 (FM2) are aboard the Earth Observing System (EOS) Terra satellite and FM3 and FM4 are aboard the EOS Aqua satellite. Each CERES instrument measures in three broadband radiometric regions: the shortwave (SW 0.3-5μm), total (0.3- > 100μm), and window (8-12μm). It has been found that both CERES instruments on the Terra platform imply that the SW flux scattered from the Earth had dropped by up to 2% from 2000 to 2004. No climatological explanation for this drop could be found, suggesting the cause was a drift in both the Terra instruments. However, the onboard calibration lamps for the SW channels do not show a change in gain of this magnitude. Experience from other satellite missions has shown that optics in the orbital environment can become contaminated, severely reducing their transmission of ultra-violet (UV) radiation. Since the calibration lamps emit little radiance in the UV spectral region it was suggested that contaminates could be responsible for an undetectable 'spectral darkening' of the CERES SW channel optics and hence the apparent drop in SW flux. Further evidence for this was found by looking at the comparison between simultaneous measurements made by FM1 and FM2. The proposed mechanisms for contaminant build up would not apply to a CERES instrument operating in the normal cross track scan mode. Indeed it was found from the comparison between CERES instruments on Terra that the response of the instrument operating in rotating azimuth plane (RAPS) mode consistently dropped relative to the other cross track instrument. Since at all times one of the instruments operates in cross track mode, where it is not subject to spectral darkening, it allowed that unit to be used as a calibration standard from which the darkening of the other RAPS instrument can be measured. A table of adjustment coefficients to compensate for this spectral darkening are therefore derived in this paper. These figures are designed to be multiplied by SW fluxes or radiances produced in the climate community using Edition 2 CERES data. SW CERES measurements that have been revised using these coeffcients are therefore to be referred to as ERBE-like Edition2_Rev1 or SSF Edition2B_Rev1 data in future literature. Current work to fully characterize the effect of spectral darkening on the instrument spectral response before the release of Edition 3 data is also described.

Proceedings Article | 22 August 2005 Paper

Z-domain numerical filter for removal of thermistor bolometer slow mode transients

Grant Matthews, Kory Priestley, Peter Spence

Proceedings Volume 5882, 588213 (2005) https://doi.org/10.1117/12.613981

KEYWORDS: Sensors, Bolometers, Optical filters, Neodymium, Calibration, Wheatstone bridges, Electronic filtering, Clouds, Thermal modeling, Signal detection

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Proceedings Article | 26 October 2004 Paper

Instantaneous sampling accuracy of the Geostationary Earth Radiation Budget (GERB) experiment

Grant Matthews

Proceedings Volume 5542, (2004) https://doi.org/10.1117/12.560640

KEYWORDS: Sensors, Point spread functions, Digital signal processing, Error analysis, Clouds, Satellites, Climatology, Mirrors, Filtering (signal processing), Climate change

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Showing 5 of 12 publications

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