Flight and ground calibrations: TRMM and EOS-AM1 clouds and the Earth's radiant energy system (CERES) instrument zero radiance offsets determination

Susan Thomas; Bruce R. Barkstrom; Robert Benjamin Lee III; Kory J. Priestley; Herbert C. Bitting; Jack Paden; Dhirendra K. Pandey; G. Louis Smith; K. Lee Thornhill; Robert S. Wilson

doi:10.1117/12.325637

3 October 1998 Flight and ground calibrations: TRMM and EOS-AM1 clouds and the Earth's radiant energy system (CERES) instrument zero radiance offsets determination

Susan Thomas, Bruce R. Barkstrom, Robert Benjamin Lee III, Kory J. Priestley, Herbert C. Bitting, Jack Paden, Dhirendra K. Pandey, G. Louis Smith, K. Lee Thornhill, Robert S. Wilson

Author Affiliations +

Proceedings Volume 3439, Earth Observing Systems III; (1998) https://doi.org/10.1117/12.325637
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The Clouds and the Earth's Radiant Energy System (CERES) instrument has scanning thermistor bolometers that measure broadband radiances in the shortwave, total and 8-12 micron water vapor window regions. On November 27, 1997, the CERES Protoflight model (PFM) instrument was launched aboard the Tropical Rainfall measuring Mission spacecraft. In December 1998, the CERES FLight models I and II instruments are scheduled for launch on the Earth Observing System-AM1 platform. The instrument generally operates in three scan modes; crosstrack normal, rotating azimuth normal and rotating azimuth short modes, while measuring the earth reflected and emitted radiances. The sensor measurements have shown a dependency on observation geometry during each of these scan modes of operation. At each elevation observation angle, the zero radiance offsets of the sensors were measured on the ground using end caps and a constant radiance reference source, consisting of a curved strip blackbody. On-orbit, offsets were determined from observations of cold space. This paper describes the procedures and facilities used to determine the zero radiance offsets. The offset values calculated from ground and in-flight data for TRMM sensors, as well as the ground measurements for the FM1 and FM2 sensors are presented.

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Susan Thomas, Bruce R. Barkstrom, Robert Benjamin Lee III, Kory J. Priestley, Herbert C. Bitting, Jack Paden, Dhirendra K. Pandey, G. Louis Smith, K. Lee Thornhill, and Robert S. Wilson "Flight and ground calibrations: TRMM and EOS-AM1 clouds and the Earth's radiant energy system (CERES) instrument zero radiance offsets determination", Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); https://doi.org/10.1117/12.325637

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