On-orbit stability and performance of the Clouds and Earth’s Radiant Energy System (CERES) instrument sensors onboard the Aqua and Terra Spacecraft

Shankar, Mohan; Priestley, Kory J.; Smith, N.; Thomas, Susan; Walikainen, Dale R.

doi:10.1117/12.2060871

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The sensor gains applied to the CERES Edition4 data products are calculated as a 5-month running mean centered on the current month to reduce noise in the monthly gains. The resulting gains are trended over the length of the mission in order to monitor any changes in sensor performance 10 .…”

Section: Gain Correctionsmentioning

confidence: 99%

Assessment of the clouds and the Earth’s Radiant Energy System (CERES) instrument performance and stability on the Aqua, Terra, and S-NPP spacecraft

et al. 2015

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The Clouds and the Earth's Radiant Energy System (CERES) scanning radiometer is designed to measure reflected solar radiation and thermal radiation emitted by the Earth. Five CERES instruments are currently taking active measurements in-orbit with two aboard the Terra spacecraft (FM1 and FM2), two aboard the Aqua spacecraft (FM3 and FM4), and one aboard the S-NPP spacecraft (FM5). The CERES instrument uses three scanning thermistor bolometers to make broadband radiance measurements in the shortwave (0.3 -5.0 micrometers), total (0.3 ->100 micrometers) and water vapor window (8 -12 micrometer) regions. An internal calibration module (ICM) used for in-flight calibration is built into the CERES instrument package consisting of an anodized aluminum blackbody source for calibrating the total and window sensors, and a shortwave internal calibration source (SWICS) for the shortwave sensor. The ICM sources, along with a solar diffusor called the Mirror Attenuator Mosaic (MAM), are used to define shifts or drifts in the sensor response over the life of the mission. In addition, validation studies are conducted to understand any spectral changes that may occur with the sensors and assess the pointing accuracy of the instrument, allowing for corrections to be made to the radiance calculations in CERES data products. This paper covers the observed trends in the internal and solar calibration data, discusses the latest techniques used to correct for sensor response, and explains the validation studies used to assess the performance and stability of the instrument.

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Section: Gain Correctionsmentioning

confidence: 99%

Assessment of the clouds and the Earth’s Radiant Energy System (CERES) instrument performance and stability on the Aqua, Terra, and S-NPP spacecraft

et al. 2015

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“…The CERES instrument is calibrated on board using concentric groove blackbodies for the window and total channels and a stable tungsten lamp for the shortwave channel [ Priestley et al , ]. Additionally, the calibration is assessed using several vicarious techniques including direct comparison between the FM1 and FM2 instruments, use of tropical mean value comparisons, and a deep convective cloud‐based three channel intercomparison [ Shankar et al , ]. MISR is calibrated on board using a combination of Spectralon diffuse calibration panels and two sets of photodiodes that are used to measure the panel reflected radiance during calibration periods [ Chrien et al , ].…”

Section: Data Setsmentioning

confidence: 99%

On the relative stability of CERES reflected shortwave and MISR and MODIS visible radiance measurements during the Terra satellite mission

Corbett

Loeb

2015

JGR Atmospheres

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Fifteen years of visible, near‐infrared, and broadband shortwave radiance measurements from Clouds and the Earth's Radiant Energy System (CERES), Multiangle Imaging Spectroradiometer (MISR), and Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on board NASA's Terra satellite are analyzed in order to assess their long‐term relative stability for climate purposes. A regression‐based approach between CERES, MODIS, and MISR (An camera only) reflectances is used to calculate the bias between the different reflectances relative to a reference year. When compared to the CERES shortwave broadband reflectance, relative drift between the MISR narrowbands is within 1% decade−1. Compared to the CERES shortwave reflectance, the MODIS narrowband reflectances show a relative drift of less than −1.33% decade−1. When compared to MISR, the MODIS reflectances show a relative drift of between −0.36% decade−1 and −2.66% decade−1. We show that the CERES Terra SW measurements are stable over the time period relative to CERES Aqua. Using this as evidence that CERES Terra may be absolutely stable, we suggest that the CERES, MISR, and MODIS instruments meet the radiometric stability goals for climate applications set out in Ohring et al. (2005).

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Tropical Mean Fluxes: A Tool for Calibration and Validation of CERES Radiometers

Smith

Thomas

Priestley

et al. 2016

IEEE Trans. Geosci. Remote Sensing

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On-orbit stability and performance of the Clouds and Earth’s Radiant Energy System (CERES) instrument sensors onboard the Aqua and Terra Spacecraft

Cited by 3 publications

References 6 publications

Assessment of the clouds and the Earth’s Radiant Energy System (CERES) instrument performance and stability on the Aqua, Terra, and S-NPP spacecraft

Assessment of the clouds and the Earth’s Radiant Energy System (CERES) instrument performance and stability on the Aqua, Terra, and S-NPP spacecraft

On the relative stability of CERES reflected shortwave and MISR and MODIS visible radiance measurements during the Terra satellite mission

Tropical Mean Fluxes: A Tool for Calibration and Validation of CERES Radiometers

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