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Proceedings Paper

Performance trends of Clouds and the Earth’s Radiant Energy System (CERES) instruments aboard terra, aqua, S-NPP and NOAA-20 missions
Author(s): Susan Thomas; K. J. Priestley; M. Shankar; P. C. Hess; R. S. Wilson; N. P. Smith; N. M. Smith; D. R. Walikainen; Z. P. Szewczyk
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Paper Abstract

Clouds and the Earth’s Radiant Energy System (CERES) instrument was designed to provide accurate measurements for the long-term monitoring of Earth’s radiation energy budget. Seven copies of the CERES instruments were built by Northrop Grumman Aerospace Systems (NGAS) and has been flying aboard five spacecraft platforms. The CERES instrument with the three scanning sensors measure radiances in 0.3 to 5.0 micron region with Shortwave sensor, 0.3 to >100 microns with Total sensor, and either a 8 - 12 micron region Window sensor on the first six instruments or a 5 – 35 micron longwave sensor on the seventh Flight Model 6 (FM6) instrument. Currently there are six instruments actively collecting Longwave and Shortwave measurements. Four of the CERES instruments (Flight Models1 through 4) fly aboard Earth Observing System (EOS) Terra and Aqua platforms with two instruments aboard each spacecraft. Flight Models 5 and 6 are aboard the Suomi-NPP and NOAA-20 spacecrafts. The pre-launch accuracy goal for the CERES instrument measurements is to have the emitted longwave radiances within 0.5% and the shortwave radiances within 1.0%. The in-flight evaluation of the sensor performance are carried out using the internal calibration module (ICM) comprising of blackbody sources and tungsten lamp, and a solar diffuser plate known as the Mirror Attenuator Mosaic (MAM). The ICM and MAM calibration results are instrumental in understanding the ground to flight shift and in-flight drifts in CERES sensors’ gains. In addition, several validation studies utilising targets such as tropical ocean and deep convective clouds are performed as part of the Cal/Val protocol. Comparisons of sensor measurements from instruments on the same spacecraft as well as coincident measurements of CERES instruments on different spacecraft at overpass regions are also performed to support the intercomparison studies between the sensors of different instruments. The calibration and validation studies collectively provide good understanding of the instrument performance and any changes occuring at different spectral regions of the sensors. This paper discusses the various studies utilized to evaluate the sensor perform.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11127, Earth Observing Systems XXIV, 1112716 (9 September 2019); doi: 10.1117/12.2530828
Show Author Affiliations
Susan Thomas, Science Systems and Applications, Inc. (United States)
K. J. Priestley, NASA Langley Research Ctr. (United States)
M. Shankar, Science Systems and Applications, Inc. (United States)
P. C. Hess, Science Systems and Applications, Inc. (United States)
R. S. Wilson, Science Systems and Applications, Inc. (United States)
N. P. Smith, Science Systems and Applications, Inc. (United States)
N. M. Smith, Science Systems and Applications, Inc. (United States)
D. R. Walikainen, Science Systems and Applications, Inc. (United States)
Z. P. Szewczyk, Science Systems and Applications, Inc. (United States)

Published in SPIE Proceedings Vol. 11127:
Earth Observing Systems XXIV
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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