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

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

Research output: Contribution to conferencePaper


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.
Original languageAmerican English
Number of pages8
StatePublished - 2022
EventInternational Radiation Symposium 2022 - Thessaloniki, Greece
Duration: 4 Jul 20228 Jul 2022


ConferenceInternational Radiation Symposium 2022
CityThessaloniki, Greece

Bibliographical note

See NREL/TP-1900-89020 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-1900-83945


  • ACR
  • atmospheric longwave irradiance
  • black body
  • IRIS
  • pyrgeometer


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