Yamada, Y; Harris, S; Hayes, M; Simpson, R; Wimmer, W; Holmes, R; Nightingale, T; Lee, A; Jepsen, N; Morgan, N; Gottsche, F M; Niclos, R; Perello, M; Donlon, C; Fox, N (2024) 2022 CEOS International Thermal Infrared Radiometer Comparison: Part I: Laboratory Comparison of Radiometers and Blackbodies. Journal of Atmospheric and Oceanic Technology, 41 (3). pp. 295-307.

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Abstract

An international comparison of field deployed radiometers for sea surface temperature measurement was conducted in June 2022. The comparison comprised a laboratory comparison and a field comparison. In the field comparison following the laboratory comparison, the radiometers were installed at the tip of a pier facing south on the south coast of England so as to measure the same area of the sea. During the five-day period, six radiometers were compared against each other, and the difference from the reference value, derived as the mean SST measured by the participants, was evaluated. This paper reports the result of the second half of the comparison, the field comparison of radiometers.

For the blackbody comparison, the brightness temperature reported by the participants agreed with the reference value measured by the NPL transfer standard radiometer within the uncertainties for all temperatures and for all blackbodies. As for the radiometer comparison, the temperature range of most interest from the SST measurement point of view is 10 °C to 30 °C, and in this temperature range, and up to the maximum comparison temperature of 50 °C, all participants reported results that were in agreement with the reference, while below 0 °C the reported values showed divergence from the reference and exceeded the uncertainties. The divergence shows there is room for improvement in uncertainty estimation, although it will have limited implication in the SST measurement. Together with the agreement confirmed in the field comparison, the results support the reliability of the SST measurements by the radiometers.

Item Type:	Article
Keywords:	Ocean; Sea surface temperature; Infrared radiation; Instrumentation/sensors; Remote sensing; Measurements
Subjects:	Optical Radiation and Photonics > Radiometry and Detectors
Divisions:	Thermal & Radiometric Metrology
Identification number/DOI:	10.1175/JTECH-D-23-0059.1
Last Modified:	24 Jun 2025 14:18
URI:	https://eprintspublications.npl.co.uk/id/eprint/10177