A determination of atmospheric turbidity coefficient from visibility data

Abstract

This research determined the ÅngströmWs turbidity coefficient in Khon Kaen province (16.43 PN and102.83 PE) and studied the variation of atmospheric turbidity to find out relation between turbidity and visibilityin Khon Kaen province. The quantity of atmospheric turbidity was shown in ÅngströmWs turbidity coefficient(β ). Values of the β were determined from direct irradiance calculation, ozone data, precipitable water vapordata, and visibility data at the same station in clear skies. The result showed that the average amount of βwas 0.152 0.008. This indicated the beginning of turbidity. The relation between β and the monthly averagevisibility was relatively high. Moreover, the values of the ÅngströmWs turbidity coefficient were relatively highin the dry season (December March) but were likely to decrease in the wet season (April November).