Abstract
This work deals with the Linke turbidity factor, based on total spectrum observations of the direct solar beam and aerosol turbidity parametersa a , β, and α based on observations in broad spectral bands. Diurnal and seasonal variations of these turbidity parameters were analyzed for the period 1975 to 1991. Annual variations of these parameters show low values in winter and high values in both spring and summer. The extinction coefficients decrease with increase of both wavelength and optical airmass. Trend analysis shows an increase in aerosol extinction coefficient below 0.63 μm, and a slight decrease for longer wave-lengths. Linear regression relations are also constructed to estimate botha a and β whenT L is available. The relations show thata a can be estimated with errors below 20%. The relation with the β parameter, may give better results when it is estimated by assigning a fixed value of α.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
