Yamada, Y; Harris, S; Wimmer, W; Holmes, R; Nightingale, T; Lee, A; Jepsen, N; Morgan, N; Gottsche, F M; Niclos, R; Perello, M; Garcia-Santos, V; Donlon, C; Fox, N (2024) 2022 CEOS International Thermal Infrared Radiometer Comparison: Part II: Field Comparison of Radiometers. Journal of Atmospheric and Oceanic Technology, 41 (3). pp. 309-318.

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Abstract

An international comparison of field-deployed radiometers for sea surface temperature measurement was conducted during two weeks in June 2022. The comparison comprised a laboratory comparison and a field comparison. The field comparison of the radiometers took place on the second week at a seaside pier on the south coast of England. Six thermal infrared radiometers were compared against each other while continuously viewing the same surface of the sea from the tip of the pier. This paper reports the results of this field comparison.

All participants agreed with the reference value, evaluated as the simple mean of the participant reported values, within the claimed uncertainties. The sea surface temperature variation during the five-day period was 3 °C around 18.3 °C, which is two times larger in range than in the previous comparison in 2016, while the mean of the difference from the reference value over the period evaluated for each participant, were all found to be within 0.07 °C, which is a two-times improvement from the previous.

An insignificant but noticeable abrupt shift in measured value occurred in one of the radiometers, which could not have been detected without comparison with other instruments. This demonstrated the effectiveness of having long term stable internal references in the instrument, a feature the particular radiometer did not have.

The combined results from the laboratory comparison and the field comparison contribute to improve confidence in the sea surface temperature measurements.

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-23-0060.1
Last Modified:	25 Jun 2025 13:13
URI:	https://eprintspublications.npl.co.uk/id/eprint/10178