Global Journal of Environmental Sciences

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Estimation of global solar radiation from sunshine hours for Warri, Nigeria

MD Umoh, SO Udoh


Multiple linear regression models were developed to estimate the monthly daily sunshine hours using four parameters during a period of eleven years (1997 to 2007) for Warri, Nigeria (Latitude of 5o 34’ 21.0’’); the parameters include, Relative Humidity, Maximum and Minimum Temperature, Rainfall and Wind Speed. The result of the correlations showed that four Variable correlations with the highest value of correlation coefficient R gives the best result when considering the error term Root Mean Square Error (RMSE). The correlation is given as S = - 22.424 + 0.272RH + 1.388T – 9.791RF – 0.623W Where RH is the Relative Humidity, T is the difference of the Maximum and Minimum Temperature, RF is the average rainfall and W is the Wind Speed. The developed correlation can be used for estimating Sunshine hours for Warri and other locations with similar climatic conditions.



AJOL African Journals Online