2022 CEOS International Thermal Infrared Radiometer Comparison: Part I: Laboratory Comparison of Radiometers and Blackbodies

Yoshiro Yamada, Subrena Harris, Michael Hayes, Rob Simpson, Werenfrid Wimmer, Raymond Holmes, Tim Nightingale, Arrow Lee, Nis Jepsen, Nicole Morgan, F. Göttsche, R. Niclós, Martín Perelló, Craig Donlon, Nigel Fox
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引用次数: 2

Abstract

An international comparison of field deployed radiometers for sea surface skin temperature (SSTskin) retrieval was conducted in June 2022. The campaign comprised a laboratory and a field comparison. In the laboratory part the radiometers were compared against reference standard blackbodies, while the same was done with the blackbodies used for the calibration of the radiometers against a transfer standard radiometer. Reference values were provided by the National Physical Laboratory (NPL), traceable to the primary standard on the International Temperature Scale of 1990. This was followed by the field comparison at a seaside pier on the south coast of England, where the radiometers were compared against each other while viewing the closely adjacent surface of the sea. This paper reports the results of the laboratory comparison of radiometers and blackbodies. For the blackbody comparison, the brightness temperature of the blackbody 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. For the radiometer comparison, the temperature range of most interest from the SSTskin retrieval 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 were in agreement with the reference. On the other hand, below 0 °C the reported values showed divergence from the reference and the differences exceeded the uncertainties. The divergence shows there is room for improvement in uncertainty estimation at lower temperatures, although it will have limited implication in the SSTskin retrieval.
2022 CEOS 国际热红外辐射计比较:第一部分:辐射计和黑体的实验室比较
2022 年 6 月,对用于海表皮肤温度(SSTskin)检索的实地部署辐射计进行了国际比较。这次活动包括实验室和实地对比。在实验室部分,将辐射计与参考标准黑体进行比较,同时将用于校准辐射计的黑体与转移标准辐射计进行比较。参考值由国家物理实验室(NPL)提供,可追溯到 1990 年国际温标的主要标准。随后,在英格兰南部海岸的一个海滨码头进行了实地比较,在那里,辐射计在观察紧邻的海面时相互比较。在黑体比对中,参与者报告的黑体亮度温度与 NPL 转移标准辐射计测量的参考值一致,所有温度和所有黑体的测量值都在不确定范围内。在辐射计比对中,从 SSTskin 数据检索的角度来看,最感兴趣的温度范围是 10 ℃ 至 30 ℃,在这一温度范围内,以及最高比对温度 50 ℃ 之前,所有参与者报告的结果都与参考值一致。另一方面,在 0 °C 以下,报告值与参考值有差异,差异超过了不确定性。这种差异表明,在较低温度下的不确定性估计还有改进的余地,尽管这对 SSTskin 数据检索的影响有限。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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