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Title: Results of Absolute Cavity Pyrgeometer and Infrared Integrating Sphere Comparisons

Abstract

Accurate and traceable atmospheric longwave irradiance measurements are required for understanding radiative impacts on the Earth's energy budget. The standard to which pyrgeometers are traceable is the interim World Infrared Standard Group (WISG), maintained in the Physikalisch-Meteorologisches Observatorium Davos (PMOD). The WISG consists of four pyrgeometers that were calibrated using Rolf Philipona's Absolute Sky-scanning Radiometer [1]. The Atmospheric Radiation Measurement (ARM) facility has recently adopted the WISG to maintain the traceability of the calibrations of all Eppley precision infrared radiometer (PIR) pyrgeometers. Subsequently, Julian Grobner [2] developed the infrared interferometer spectrometer and radiometer (IRIS) radiometer, and Ibrahim Reda [3] developed the absolute cavity pyrgeometer (ACP). The ACP and IRIS were developed to establish a world reference for calibrating pyrgeometers with traceability to the International System of Units (SI). The two radiometers are unwindowed with negligible spectral dependence, and they are traceable to SI units through the temperature scale (ITS-90). The two instruments were compared directly to the WISG three times at PMOD and twice at the Southern Great Plains (SGP) facility to WISG-traceable pyrgeometers. The ACP and IRIS agreed within +/- 1 W/m2 to +/- 3 W/m2 in all comparisons, whereas the WISG references exhibit a 2-5 Wm2 low biasmore » compared to the ACP/IRIS average, depending on the water vapor column, as noted in Grobner et al. [4]. Consequently, a case for changing the current WISG has been made by Grobner and Reda. However, during the five comparisons the column water vapor exceeded 8 mm. Therefore, it is recommended that more ACP and IRIS comparisons should be held under different environmental conditions and water vapor column content to better establish the traceability of these instruments to SI with established uncertainty.« less

Authors:
 [1]; ORCiD logo [1];  [1];  [2];  [2];  [3];  [3];  [3];  [4]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Physikalisch-Meteorologisches Observatorium Davos (PMOD)
  3. National Oceanic and Atmospheric Administration
  4. Deutscher Wetterdienst
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1425572
Report Number(s):
NREL/PO-5D00-70955
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the ARM/ASR Science Team Meeting at the 2018 Joint ARM User Facility and ASR PI Meeting, 19-23 March 2018, Tysons, Virginia
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; absolute cavity pyrgeometers; ACPs; infrared integrating sphere; IRIS

Citation Formats

Reda, Ibrahim M, Sengupta, Manajit, Dooraghi, Michael R, Grobner, Julian, Thomann, Christian, Long, Chuck, McComiskey, Allison, Hall, Emiel, and Wacker, Stefan. Results of Absolute Cavity Pyrgeometer and Infrared Integrating Sphere Comparisons. United States: N. p., 2018. Web.
Reda, Ibrahim M, Sengupta, Manajit, Dooraghi, Michael R, Grobner, Julian, Thomann, Christian, Long, Chuck, McComiskey, Allison, Hall, Emiel, & Wacker, Stefan. Results of Absolute Cavity Pyrgeometer and Infrared Integrating Sphere Comparisons. United States.
Reda, Ibrahim M, Sengupta, Manajit, Dooraghi, Michael R, Grobner, Julian, Thomann, Christian, Long, Chuck, McComiskey, Allison, Hall, Emiel, and Wacker, Stefan. Mon . "Results of Absolute Cavity Pyrgeometer and Infrared Integrating Sphere Comparisons". United States. doi:. https://www.osti.gov/servlets/purl/1425572.
@article{osti_1425572,
title = {Results of Absolute Cavity Pyrgeometer and Infrared Integrating Sphere Comparisons},
author = {Reda, Ibrahim M and Sengupta, Manajit and Dooraghi, Michael R and Grobner, Julian and Thomann, Christian and Long, Chuck and McComiskey, Allison and Hall, Emiel and Wacker, Stefan},
abstractNote = {Accurate and traceable atmospheric longwave irradiance measurements are required for understanding radiative impacts on the Earth's energy budget. The standard to which pyrgeometers are traceable is the interim World Infrared Standard Group (WISG), maintained in the Physikalisch-Meteorologisches Observatorium Davos (PMOD). The WISG consists of four pyrgeometers that were calibrated using Rolf Philipona's Absolute Sky-scanning Radiometer [1]. The Atmospheric Radiation Measurement (ARM) facility has recently adopted the WISG to maintain the traceability of the calibrations of all Eppley precision infrared radiometer (PIR) pyrgeometers. Subsequently, Julian Grobner [2] developed the infrared interferometer spectrometer and radiometer (IRIS) radiometer, and Ibrahim Reda [3] developed the absolute cavity pyrgeometer (ACP). The ACP and IRIS were developed to establish a world reference for calibrating pyrgeometers with traceability to the International System of Units (SI). The two radiometers are unwindowed with negligible spectral dependence, and they are traceable to SI units through the temperature scale (ITS-90). The two instruments were compared directly to the WISG three times at PMOD and twice at the Southern Great Plains (SGP) facility to WISG-traceable pyrgeometers. The ACP and IRIS agreed within +/- 1 W/m2 to +/- 3 W/m2 in all comparisons, whereas the WISG references exhibit a 2-5 Wm2 low bias compared to the ACP/IRIS average, depending on the water vapor column, as noted in Grobner et al. [4]. Consequently, a case for changing the current WISG has been made by Grobner and Reda. However, during the five comparisons the column water vapor exceeded 8 mm. Therefore, it is recommended that more ACP and IRIS comparisons should be held under different environmental conditions and water vapor column content to better establish the traceability of these instruments to SI with established uncertainty.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 05 00:00:00 EST 2018},
month = {Mon Mar 05 00:00:00 EST 2018}
}

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