Determination of linke turbidity factor from the precipitable water vapor and visibility data

Abstract

The Linke turbidity factor (T_L) is calculated from of direct solar radiation in a clear day. The data between years 2011-2013 from three measurement stations including Chiang Mai, Ubon Ratchathani and Songkhla were used in the calculation. The relationship between T_L with the precipitable water vapor and visibility in a mathematical model was investigated. The results showed that the relationship has a relatively high of reliability. The model was validated using independent data do not take modeling, found that predominantly high correlations and relatively high coefficients of variation were obtained for the linear relationships at whole dataset. T_L models were used to calculate nationwide, found that the Linke turbidity factor is high in the dry season (November-April), and decrease in the rainy season (May-October).