Temperature Correction of Solar Radiation on Clear Sky Using by Modified Pyranometer

Title & Authors
Temperature Correction of Solar Radiation on Clear Sky Using by Modified Pyranometer
Zo, Il-Sung; Jeong, Myeong-Jae; Lee, Kyu-Tae; Jee, Joon-Bum; Kim, Bu-Yo;

Abstract
Pyranometer have many uncertainty factors (sensitivity function, thermal offset, other spectral effect, geometric, environment, and equipment etc.) than pyrheliometer. The solution for most of the uncertainty factors have been researched, but the problem for thermal offset is being continued research so far. Under the clear sky, due to the thermal offset of pyranometer, the diffuse and global radiation have been negative value for the nighttime and lower value for the daytime, respectively. In order to understand the uncertainty of the thermal offset effect, solar radiation are observed and analyzed using Ji and Tsay method and data from modified pyranometer. As a result of performing temperature correction using the modified pyranometer, the slope (dome factor; k) and intercept ($\small{r_0}$) from a linear regression method are 0.064 and $\small{3.457g{\cdot}m^{-2}{\cdot}k^{-1}}$, respectively. And the solar radiation is decreased significantly due to the effect of thermal offset during nighttime. The solar radiation from modified pyranometer increased approximately 8% higher than its observed by general pyranometer during daytime. By the way, these results did not generalize because its result is for only single case in clear sky. Accordingly, it is to required for accurate results obtained by the various cases (clear, cloudy and rainy) with longterm observations.
Keywords
Language
Korean
Cited by
References
1.
Jee. J. B, Zo. I. S, Lee. K. T, and Choi. Y. J, Distribution of photovoltaic energy including topography effect, Journal of Korea Earth Science Society, Vol. 32, No. 2, pp. 190-199, 2011.(in Korea with English abstract)

2.
C. G. Abbot and L. B. Aldrich, The pyranometer- An instrument for measuring sky radiation, Smithsonian Miscellaneous Collections, Vol. 66, No. 7, pp. 1-7, 1916.

3.
WMO, WMO-8 Guide to Meteorological Instruments and Methods of Observation, Secretariat of the World Meteorological Organization, 1997. [Available from World Meteorological Organization, Case Postale 2300, CH-1211 Geneva 2, Switzerland.]

4.
C. Frohlich, World Radiometric Reference: WMO/CIMO Final Report, WMO No. 490, pp. 97-100, 1977.

5.
L. J. B. McArthur, Baseline Surface Radiation Network (BSRN), Operations Manual, WMO/TD-No. 1274, WCRP/WMO, 2004.

6.
A. G. Christian and R. M. Daryl, Modeling solar radiation at the earth surface - Chapter 1 Solar radiation measurement: progress in radiometry for improved modeling, Springer, PP. 12-17, 2007.

7.
S. Kato, T. P. Ackerman, E. E. Clothiaux, J. H. Mather, G. G. Mace, M. L. Wesley, F. Murcray and J. Michalsky, Uncertainties in modeled and measured and measured clear-sky surface shortwave irradiance. Journal of Geophysics Earth Research, Vol. 32, No. D22, PP. 25881-25898, 1997.

8.
A. J. Drummond and J. J. Roche, Corrections to be applied to measurements made with wppley (and other) spectral radiometers when used with schott colored glass filters, Journal of Applied Meteorology, Vol. 4, pp. 741-744, 1965.

9.
M. S. Amie, Prediction and measurement of thermal exchanges within pyranometers, pp. 8, 1999.

10.
J. R. Garratt, Incoming shortwave fluxes at the surface - a comparison of GCM results with observations. Journal of Climate, Vol. 7, pp. 72-80, 1994.

11.
M. Wild, A. Ohmura, H. Gilgen, E. Roeckner, Validation of GCM simulated radiative fluxes using surface observations, Journal of Climate, Vol. 8, pp. 1309-1324, 1995.

12.
M. Wild, A. Ohmura, H. Gilgen, E. Roeckner, M. Giorgetta, J. J. Morcrette, The disposition of radiative energy in the global climate system: GCM versus observational estimates, Climate Dynamics, Vol. 14, pp. 853-869, 1998.

13.
A. Berk, G. P. Anderson, P. K. Acharya and E. P. Shettle, "MODTRAN$^{(R)}$5.2.1 User's Manual," April 2011, to be published.

14.
R. Philipona, Underestimation of Solar Global and Diffuse Radiation Measured at Earth's Surface, Journal of Geophysics Research, Vol. 107, No. D22, pp. 4654, 2002.

15.
J. J. Michalsky, R. Dolce, M. Rubes, D. Nelson, T. Stoffel, M. Wesley, M. Split and J. DeLuisi, Optimal measurement of surface shortwave irradiance using current instrumentation. Journal of Atmospheric Ocean Technical, Vol. 16, pp. 55-69, 1999.

16.
E. G. Dutton, J. J. Michalsky, T. Stoffel, B. W. Forgan, J. Hickey, D. W. Nelson, T. L. Alberta and I. Reda, Measurement of broadband diffuse solar irradiance using current commercial instrumentation with a correction for thermal offset error, Journal of Atmospheric Ocean Technical, Vol. 18, pp. 297-314, 2001.

17.
Q. Ji and S.C. Tsay, A novel nonintrusive method to resolve the thermal dome effect of pyranometers: instrumentation and observational basis, Journal of Geophysics Research, Vol. 115, 2010. doi:10.1029/2009JD013483.

18.
Q. Ji,, S. C. Tsay, K. M. Lau, R. A. Hansell, J. J. Butler and J. W. Cooper, A novel nonintrusive method to resolve the thermal dome effect of pyranometers: radiometric calibration and implications. Journal of Geophysics Research, Vol. 116, 2011. D24105, doi:10.1029/2011JD016466.

19.
B. M. Hickey, Physical Oceanography. Pages 19-70 in M. D. Dailey, D. J. Reish and J. W. Anderson (eds), Ecology of the Southern California Bight. University of California Press, Berkeley, California, 1993.

20.
J. Walker, C. L. Cromer and J. T. McLean, A Technique for Improving the Calibration of Large-area Sphere Sources, Proc. SPIE, 1493, pp. 224-230, 1991. doi:10.1117/12.46707.