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DOE OSTI · 2318708

Traceability of Surface Longwave Irradiance Measurements to SI Using the IRIS Radiometers

Grobner, Julian·Thomann, Christian·Reda, Ibrahim·Turner, David D.·Feierabend, Moritz·Monte, Christian·McComisky, Allison·Reiniger, Max
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Abstract

The traceability of the World Infrared Standard Group of Pyrgeometers (WISG) was established through the comparison to several independently calibrated radiometers (Infrared Integrating Sphere Radiometer (IRIS), Absolute Cavity Pyrgeometer (ACP), Atmospheric Emittance Radiance Interferometer (AERI)). The traceability of the longwave irradiance measurements to SI was validated by a comparison of two independently characterized blackbody cavities.

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Grobner, Julian, Thomann, Christian, Reda, Ibrahim, Turner, David D., Feierabend, Moritz, Monte, Christian, McComisky, Allison, Reiniger, Max. 2024-01-18. Traceability of Surface Longwave Irradiance Measurements to SI Using the IRIS Radiometers. https://doi.org/10.1063/5.0183304

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DOE OSTI2022

Traceability of Surface Longwave Irradiance Measurements to SI Using the IRIS Radiometers: Preprint

The World Radiation Center at PMOD/WRC is operated on behalf of the WMO. The Infrared Radiometry Section of the WRC (WRC-IRS) provides traceability of downwelling atmospheric longwave radiation measured with pyrgeometers by comparison to the World Infrared Standard Group (WISG) [1]. As has been discussed previously [2], the current implementation of the WISG measures lower longwave irradiances than the two candidate reference radiometers IRIS (Infrared Integrating Sphere Radiometer) and the ACP (Absolute Cavity Pyrgeometer). To validate the findings reported in [2], additional measurements since that publication in 2014 have been performed and are discussed in this paper. Specifically, Measurements during cloud-free nights at PMOD/WRC between the WISG and IRIS radiometers, A field campaign at the Atmospheric Radiation Monitoring Site (ARM) at Southern Great Plains, Oklahoma with IRIS, ACP, AERI (Atmospheric Emittance Radiance Interferometer) and WISG traceable pyrgeometers, Laboratory comparison between the reference blackbody of PMOD/WRC with the hemispherical blackbody developed by PTB.

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