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Studies concerning the empirical relationship of cloud shade to point cloudiness (Romania)

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Summary

This paper analyses the accuracy of three simple relationships of cloud shade (CS) to point cloudiness (PC). 1740 pairs of monthly average values (CS, PC) from twenty-nine weather stations of Romania were used. The following statistical indicators of accuracy were used: the mean bias error, the mean absolute error and the root mean square error. Also, a bootstraping technique provided a general way to evaluate the confidence and significance associated with each of the statistical indicators of accuracy. The paper deals with the accuracy of the empirical relationships when applied in other areas and time intervals than the ones where the relations were determined.

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References

  • Alterio, S., Barbaro, S., Gullotti, A., 1983: Un abaco indicatore per lo studio del clima.Energie Alternative HTE 5(22), 131.

    Google Scholar 

  • Atlas, Romania. 1972–1979: Bucarest: Ed. Academiei.

  • Bădescu, V. et al., 1984: Elemente pentru un model climatologic al României util in calculul radiatiei solare, Sesiune ICEMENERG, paper II.1, Bucarest 27–28 Nov. 1984.

  • Bădescu, V., Popa, C., 1986: Criteriu climatic de stabilire a regiunilor omogene din punct de vedere meteorologic şi a anului tipic de determinare a disponibilului de radiatie solarā.Hidrotehnica 31(9), 265–268.

    Google Scholar 

  • Bădescu, V., 1987: Can the model proposed by Barbaro et al. be used to compute global solar radiation on the Romanian territory?Solar Energy 38, 247–254.

    Google Scholar 

  • Bădescu, V., 1990: Observations concerning the empirical relationship of cloud shade to point cloudiness (Romania).J. Appl. Meteor. 29(12), 1358–1360.

    Google Scholar 

  • Bâzâc, Gh., C., 1983:Influenta reliefului asupra principalelor caracteristici ale climei României. Bucarest: Ed. Academiei.

    Google Scholar 

  • Efron,B., 1981a: Nonparametric estimates of standard error, the jakknife, the bootstrap and other methods.Biometrika 68, 589–599.

    Google Scholar 

  • Efron, B., 1981b: Nonparametric standard errors and confidence intervals.Can. J. Statist. 9, 139–172.

    Google Scholar 

  • Efron, B., Gong, G., 1983: A leisurely look at the bootstrap, the jackknife and cross-validation.Am. Statist. 37, 36–48.

    Google Scholar 

  • Fox, D. G., 1981: Judging air quality model performance.Bull. Amer. Meteor. Soc. 62, 599–609.

    Google Scholar 

  • Fox, D. G., 1984: Uncertainty in air quality modeling.Bull. Amer. Meteor. Soc. 65, 27–36.

    Google Scholar 

  • Harrison, A. W., Coombes, C. A., 1986: Empirical relationship of cloud shade to point cloudiness (Canada).Solar Energy 37(6), 417–421.

    Google Scholar 

  • Hay, J. E., 1979: Calculation of monthly mean solar radiation for horizontal and inclined surfaces.Solar Energy 23, 301–307.

    Google Scholar 

  • Hoyt, D. V., 1977: Percent of possible sunshine and total cloud cover.Mon. Wea. Rev. 105, 648.

    Google Scholar 

  • IEA, 1984:Handbook of methods of estimating solar radiation. IEA Task V, Subtask B, Norrkoping: Swedish Meteorological and Hidrological Institute, 109 pp.

    Google Scholar 

  • IEA, 1988: Validation of models for estimating solar radiation on horizontal surfaces, IEA Task IX, Downsview: Atmospheric Environment Service of Canada, 99 pp.

    Google Scholar 

  • IMHR, 1962–1972: Meteorological Annual, Bucarest: Romanian Meteorological and Hydrological Institute.

    Google Scholar 

  • Page, J. K., 1961: The estimation of monthly mean values of daily total shortwave radiation on vertical and inclined surfaces from sunshine records for latitudes 40 °N–40 °S, Proc.U.N.Conference on New Sources of Energy, Paper No 35/S/98, p. 378–390.

  • Painter, H. E., 1981: The performance of a Campbell — Stokes sunshine recorder compared with a simultaneous record of normal incidence radiance.Meteor. Mag. 110, 102.

    Google Scholar 

  • Raju, A. S. N., Karuna Kumar, K., 1982: Comparison of point cloudiness and sunshined derived cloud cover in India.Pageoph. 120, 495.

    Google Scholar 

  • Rangarajan, S., Swaminsthan, M. S., Mani, A., 1984: Computation of solar radiation from observations of cloud cover.Solar Energy 32, 553.

    Google Scholar 

  • Reddy, S. J., 1974: An empirical method for estimating sunshine from total cloud amount.Solar Energy 15, 281.

    Google Scholar 

  • Willmott, C. J., 1981: On the validation of models.Phys. Geogr. 2, 184–194.

    Google Scholar 

  • Willmott, C. J., 1982: Some comments on the evaluation of model performance.Bull. Amer. Meteor. Soc. 63, 1309–1313.

    Google Scholar 

  • Willmott, C. J., 1984: On the evaluation of model performance in physical geography. In: Gaile, G. L., Willmott, C. J., (eds).Spatial Statistics and Models. Dordrecht: D. Reidel Publishing Company.

    Google Scholar 

  • Willmott, C. J. et al, 1985: Statistics for the evaluation and comparison of models.J. Geophys. Res. 90 (C5), 8999–9005.

    Google Scholar 

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Bădescu, V. Studies concerning the empirical relationship of cloud shade to point cloudiness (Romania). Theor Appl Climatol 44, 187–200 (1991). https://doi.org/10.1007/BF00868174

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  • DOI: https://doi.org/10.1007/BF00868174

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