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Title: A proposed working standard for the measurement of diffuse horizontal shortwave irradiance

Abstract

Atmospheric radiative transfer model estimates of diffuse horizontal broadband shortwave (solar) irradiance have historically been larger than measurements from a shaded pyranometer. A reference standard for the diffuse horizontal shortwave irradiance does not exist. There are no current efforts to develop an absolute standard that are known to the authors. This paper presents the case for a working standard for this measurement. Four well-behaved pyranometers from two previous intensive observation periods (IOP) were chosen for this study. The instruments were characterized for spectral and angular response before the IOP and calibrated during the IOP using a shade/unshade technique with reference direct irradiance from an absolute cavity radiometer. The results of the comparison and detailed analyses to explain the differences suggest selecting three of the four for the working standard. The 95% confidence uncertainty in this standard is estimated at 2.2% of reading + 0.2 W/m 2. In lieu of a comparison to this trio, a procedure for obtaining low-uncertainty diffuse horizontal shortwave irradiance is suggested.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1344972
Report Number(s):
NREL/JA-581-42489
Journal ID: ISSN 0148-0227; JGREA2
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Geophysical Research; Journal Volume: 112; Journal Issue: D16
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; 54 ENVIRONMENTAL SCIENCES; diffuse irradiance; working standard; pyranometer

Citation Formats

Michalsky, J. J., Gueymard, C., Kiedron, P., McArthur, L. J. B., Philipona, R., and Stoffel, T. A proposed working standard for the measurement of diffuse horizontal shortwave irradiance. United States: N. p., 2007. Web. doi:10.1029/2007JD008651.
Michalsky, J. J., Gueymard, C., Kiedron, P., McArthur, L. J. B., Philipona, R., & Stoffel, T. A proposed working standard for the measurement of diffuse horizontal shortwave irradiance. United States. doi:10.1029/2007JD008651.
Michalsky, J. J., Gueymard, C., Kiedron, P., McArthur, L. J. B., Philipona, R., and Stoffel, T. Mon . "A proposed working standard for the measurement of diffuse horizontal shortwave irradiance". United States. doi:10.1029/2007JD008651.
@article{osti_1344972,
title = {A proposed working standard for the measurement of diffuse horizontal shortwave irradiance},
author = {Michalsky, J. J. and Gueymard, C. and Kiedron, P. and McArthur, L. J. B. and Philipona, R. and Stoffel, T.},
abstractNote = {Atmospheric radiative transfer model estimates of diffuse horizontal broadband shortwave (solar) irradiance have historically been larger than measurements from a shaded pyranometer. A reference standard for the diffuse horizontal shortwave irradiance does not exist. There are no current efforts to develop an absolute standard that are known to the authors. This paper presents the case for a working standard for this measurement. Four well-behaved pyranometers from two previous intensive observation periods (IOP) were chosen for this study. The instruments were characterized for spectral and angular response before the IOP and calibrated during the IOP using a shade/unshade technique with reference direct irradiance from an absolute cavity radiometer. The results of the comparison and detailed analyses to explain the differences suggest selecting three of the four for the working standard. The 95% confidence uncertainty in this standard is estimated at 2.2% of reading + 0.2 W/m2. In lieu of a comparison to this trio, a procedure for obtaining low-uncertainty diffuse horizontal shortwave irradiance is suggested.},
doi = {10.1029/2007JD008651},
journal = {Journal of Geophysical Research},
number = D16,
volume = 112,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}