A Procedure to Correct the Historical Atmospheric Longwave Irradiance Data When the World Reference Is Established with Respect to the International System of Units

Journal Article · 10 April 2022 · Advances in Image and Video Processing

DOI: https://doi.org/10.14738/aivp.102.12098 · OSTI ID:1863538

Reda, Ibrahim ^[1]; Andreas, Afshin  ^[1]; Gotseff, Peter ^[1]

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1. National Renewable Energy Lab. (NREL), Golden, CO (United States)

Historical atmospheric longwave irradiance data sets with traceability to the International System of Units (SI) are essential for renewable energy and atmospheric science research and applications. To date, all pyrgeometers used to measure the irradiance are traceable to the interim World Infrared Standard Group (WISG), not to SI units. In 2013, the Absolute Cavity Pyrgeometer (ACP) (Reda et al. 2012) was developed at the National Renewable Energy Laboratory (NREL) to measure the atmospheric longwave irradiance. The ACP has been compared against the InfraRed Integrating Sphere (IRIS), developed by the Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center (PMOD/WRC) (Grobner 2012). The ACP and the IRIS are absolute instruments traceable to SI units through the International Temperature Scale of 1990. Results of six comparisons between the ACP and the IRIS at different locations have shown that the irradiance measured by WISG pyrgeometers underestimates clear-sky atmospheric longwave irradiance by 2 W/m² to 6 W/m² (Grobner et al. 2014); therefore, once the world reference is established with traceability to SI units, the WISG would be corrected, then used to calibrate field pyrgeometers with traceability to SI units. The following described method is used to correct the historical atmospheric longwave irradiance data sets in anticipation of the WISG scale change.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC36-08GO28308
• OSTI ID: 1863538
• Report Number(s): NREL/JA-1900-82264; {MainId:83037,"Journal ID: ISSN 2054-7412",UUID:185267a8-1f67-48ef-97e3-95a5d66a7c28,MainAdminID:64108}
• Journal Information: Advances in Image and Video Processing, Journal Name: Advances in Image and Video Processing Journal Issue: 2 Vol. 10; ISSN 2054-7412
• Publisher: Services for Science and Education LtdCopyright Statement
• Country of Publication: United States
• Language: English