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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 4 — Feb. 1, 2001
  • pp: 472–484

Determination of the thermal offset of the Eppley precision spectral pyranometer

Martial Haeffelin, Seiji Kato, Amie M. Smith, C. Ken Rutledge, Thomas P. Charlock, and J. Robert Mahan  »View Author Affiliations


Applied Optics, Vol. 40, Issue 4, pp. 472-484 (2001)
http://dx.doi.org/10.1364/AO.40.000472


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Abstract

Eppley’s precision spectral pyranometer (PSP) is used in networks around the world to measure downwelling diffuse and global solar irradiance at the surface of the Earth. In recent years several studies have shown significant discrepancy between irradiances measured by pyranometers and those computed by atmospheric radiative transfer models. Pyranometer measurements have been questioned because observed diffuse irradiances sometimes are below theoretical minimum values for a pure molecular atmosphere, and at night the instruments often produce nonzero signals ranging between +5 and -10 W m-2. We install thermistor sondes in the body of a PSP as well as on its inner dome to monitor the temperature gradients within the instrument, and we operate a pyrgeometer (PIR) instrument side by side with the PSP. We derive a relationship between the PSP output and thermal radiative exchange by the dome and the detector and a relationship between the PSP output and the PIR thermopile output (net–IR). We determine the true PSP offset by quickly capping the instrument at set time intervals. For a ventilated and shaded PSP, the thermal offset can reach -15 W m-2 under clear skies, whereas it remains close to zero for low overcast clouds. We estimate the PSP thermal offset by two methods: (1) using the PSP temperatures and (2) using the PIR net–IR signal. The offset computed from the PSP temperatures yields a reliable estimate of the true offset (±1 W m-2). The offset computed from net–IR is consistent with the true offset at night and under overcast skies but predicts only part of the true range under clear skies.

© 2001 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.6810) Instrumentation, measurement, and metrology : Thermal effects

History
Original Manuscript: May 11, 2000
Revised Manuscript: October 2, 2000
Published: February 1, 2001

Citation
Martial Haeffelin, Seiji Kato, Amie M. Smith, C. Ken Rutledge, Thomas P. Charlock, and J. Robert Mahan, "Determination of the thermal offset of the Eppley precision spectral pyranometer," Appl. Opt. 40, 472-484 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-4-472


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References

  1. L. J. B. McArthur, Baseline Surface Radiation Network (BSRN) operations manual, Version 1.0, WMO/TD 879 (World Meteorological Organization, Geneva, 1998).
  2. Guide to meteorological instruments and methods of observation, WMO 8, 6th ed. (Secretariat of the World Meteorological Organization, Geneva, 1996).
  3. I. R. Reda, “Improving the accuracy of using pyranometers to measure the clear sky global solar irradiance,” in Proceedings of the Ninth ARM Science Team Meeting (available from the U.S. Department of Commerce, Springfield, Va. 22161, 1999).
  4. J. Michalsky, E. Dutton, M. Rubes, D. Nelson, T. Stoffel, M. Wesley, M. Splitt, J. DeLuisi, “Optimal measurement of surface shortwave irradiance using current instrumentation,” J. Atmos. Oceanic Technol. 16, 55–69 (1999). [CrossRef]
  5. A. J. Drummond, J. J. Roche, “Corrections to be applied to measurements made with Eppley (and other) spectral radiometers when used with Schott colored glass filters,” J. Appl. Meteorol. 4, 741–744 (1965). [CrossRef]
  6. N. Robinson, Solar Radiation (Elsevier, New York, 1966), pp. 247–271.
  7. A. Gulbrandsen, “On the use of pyranometers in the study of spectral solar radiation and atmospheric aerosols,” J. Appl. Meteorol. 17, 899–904 (1978). [CrossRef]
  8. T. P. Charlock, T. L. Alberta, “The CERES/ARM/GEWEX experiment (CAGEX) for the retrieval of radiative fluxes with satellite data,” Bull. Am. Meteorol. Soc. 77, 2673–2683 (1996). [CrossRef]
  9. S. Kato, T. P. Ackerman, E. E. Clothiaux, J. H. Mather, G. G. Mace, M. L. Wesely, F. Murcray, J. Michalsky, “Uncertainties in modeled and measured clear-sky surface shortwave irradiances,” J. Geophys. Res. 102, 25881–25898 (1997). [CrossRef]
  10. S. Kato, T. P. Ackerman, E. G. Dutton, N. Laulainen, N. Larson, “A comparison of modeled and measured surface shortwave irradiance for a molecular atmosphere,” J. Quant. Spectrosc. Radiat. Transfer 61, 493–502 (1999). [CrossRef]
  11. R. D. Cess, Institute for Planetary Atmospheres, Marine Sciences Research Center, State University of New York, Stony Brook, N.Y. 11794–5000 (personal communication, 1999).
  12. M. Wild, “Discrepancies between model-calculated and observed shortwave atmospheric absorption in areas with high aerosol loadings,” J. Geophys. Res. 104, 27361–27373 (1999). [CrossRef]
  13. W. C. Conant, “An observational approach for determining aerosol surface radiative forcing: results from the first field phase of INDOEX,” J. Geophys. Res. 105, 15347–15360 (2000). [CrossRef]
  14. B. C. Bush, F. P. J. Valero, A. S. Simpson, L. Bignone, “Characterization of thermal effects in pyranometers: a data correction algorithm for improved measurement of surface insolation,” J. Atmos. Oceanic Technol. 17, 165–175 (2000). [CrossRef]
  15. J. Hickey, The Eppley Laboratory, Inc., P.O. Box 419, 12 Sheffield Ave., Newport, R.I. 02840 (personal communication, 1999).
  16. R. Gardon, “The emissivity of transparent materials,” J. Am. Ceramic Soc. 39, 278–285 (1956). [CrossRef]
  17. M. F. Modest, Radiative Heat Transfer (McGraw-Hill, New York, 1993).
  18. B. W. Forgan, “A new method for calibrating reference and field pyranometers,” J. Atmos. Oceanic Technol. 13, 638–645 (1996). [CrossRef]
  19. B. Albrecht, M. Peollet, S. K. Cox, “Pyrgeometer measurements from aircraft,” Rev. Sci. Instrum. 45, 33–38 (1974). [CrossRef]
  20. R. Philipona, C. Frohlich, Ch. Betz, “Characterization of pyrgeometers and the accuracy of atmospheric long-wave radiation measurements,” Appl. Opt. 34, 1598–1605 (1995). [CrossRef] [PubMed]
  21. C. W. Fairall, P. O. G. Persson, E. F. Bradley, R. E. Payne, S. P. Anderson, “A new look at calibration and use of Eppley precision infrared radiometers. Part I: theory and applications,” J. Atmos. Oceanic Technol. 15, 1229–1242 (1998). [CrossRef]
  22. M. P. Haeffelin, C. K. Rutledge, S. Kato, A. M. Smith, J. R. Mahan, “The uncertainty in surface shortwave radiation measurements: experimental tests and numerical simulations of pyranometers,” in Proceedings of the Ninth ARM Science Team Meeting (available from the U.S. Department of Commerce, Springfield, Va. 22161, 1999).
  23. A. M. Smith, M. P. Haeffelin, F. J. Nevarez, J. R. Mahan, S. Kato, C. K. Rutledge, “Experimental and theoretical study of uncertainty in pyranometers for surface radiation,” in Sensors, Systems, and Next-Generation Satellites III, H. Fujisada, J. Lurie, eds., Proc. SPIE3870, 536–547 (1999). [CrossRef]
  24. O. B. Toon, C. P. Mckay, T. P. Ackerman, “Rapid calculation of radiative heating rates and photodissociation rates in inhomogeneous multiple scattering atmosphere,” J. Geophys. Res. 94, 16287–16301 (1989). [CrossRef]
  25. J. E. Hansen, L. D. Travis, “Light scattering in planetary atmospheres,” Space Sci. Rev. 16, 527–610 (1974). [CrossRef]
  26. E. G. Dutton, Climate Monitoring and Diagnostics Laboratory, National Oceanic and Atmospheric Administration R/CMDL1, 325 Broadway, Boulder, Colo. 80303 (personal communication, 2000).
  27. T. L. Alberta, T. P. Charlock, “A comprehensive resource for the investigation of shortwave fluxes in clear conditions: CAGEX version 3,” in Preprints of the Tenth Conference on Atmospheric Radiation (American Meteorological Society, Boston, Mass., 1999), pp. 279–282.
  28. R. N. Halthore, S. E. Schwartz, E. G. Dutton, “Diffuse shortwave irradiance at surface—further issues and implications,” in Proceedings of the Ninth ARM Science Team Meeting (available from the U.S. Department of Commerce, Springfield, Va. 22161, 1999).

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