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Proceedings Paper

Radiometric calibration and performance trends of the Clouds and Earth’s Radiant Energy System (CERES) instrument sensors onboard the Terra and Aqua spacecraft
Author(s): Mohan Shankar; Kory Priestley; Nathaniel Smith; Nitchie Smith; Susan Thomas; Dale Walikainen
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Paper Abstract

The Clouds and Earth’s Radiant Energy System (CERES) instruments help to study the impact of clouds on the earth's radiation budget. There are currently five instruments- two each on board Aqua and Terra spacecraft and one on the Suomi NPP spacecraft to measure the earth’s reflected shortwave and emitted longwave energy, which represent two components of the earth’s radiation energy budget. Flight Models (FM) 1 and 2 are on Terra, FM 3 and 4 are on Aqua, and FM5 is on Suomi NPP. The measurements are made by three sensors on each instrument: a shortwave sensor that measures the 0.3-5 microns wavelength band, a window sensor that measures the water vapor window between 8-12 microns, and a total sensor that measures all incident energy (0.3- >100 microns). The required accuracy of CERES measurements of 0.5% in the longwave and 1% in the shortwave is achieved through an extensive pre-launch ground calibration campaign as well as on-orbit calibration and validation activities. Onorbit calibration is carried out using the Internal Calibration Module (ICM) that consists of a tungsten lamp, blackbodies, and a solar diffuser known as the Mirror Attenuator Mosaic (MAM). The ICM calibration provides information about the stability of the sensors’ broadband radiometric gains on-orbit. Several validation studies are conducted in order to monitor the behavior of the instruments in various spectral bands. The CERES Edition-4 data products for the FM1-FM4 instruments incorporate the latest calibration methodologies to improve on the Edition-3 data products. In this paper, we discuss the updated calibration methodology and present some validation studies to demonstrate the improvement in the trends using the CERES Edition-4 data products for all four instruments.

Paper Details

Date Published: 12 October 2015
PDF: 13 pages
Proc. SPIE 9639, Sensors, Systems, and Next-Generation Satellites XIX, 963915 (12 October 2015); doi: 10.1117/12.2194468
Show Author Affiliations
Mohan Shankar, Science Systems and Applications, Inc. (United States)
Kory Priestley, NASA Langley Research Ctr. (United States)
Nathaniel Smith, Science Systems and Applications, Inc. (United States)
Nitchie Smith, Science Systems and Applications, Inc. (United States)
Susan Thomas, Science Systems and Applications, Inc. (United States)
Dale Walikainen, Science Systems and Applications, Inc. (United States)


Published in SPIE Proceedings Vol. 9639:
Sensors, Systems, and Next-Generation Satellites XIX
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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