Abstract
The Linke turbidity coefficient has been measured for the first time
in the island of Crete, in the Mediterranean sea. Short time series
data were used to calculate the beam irradiance through the global
and diffuse irradiance on a horizontal plane. Strong seasonal effects
on the monthly averaged TL values are not observed, while their profile
displays a smooth transition from lower to higher values. Examination
of the daily averages reveals TL values as low as 2.0 and as high
as 4.0. The most frequent values of the turbidity are found in the
range of 2.3â3.5. Archival global irradiance data from the same
site are also used to estimate the turbidity with the aid of a robust
estimator and two simple, analytical models. The usefulness of this
approach is validated with data from a number of networks registering
the solar radiation. The proposed method allows to estimate the turbidity
with an rms error of 0.3, using only, good quality, global irradiance
data. Large amounts of data can easily be processed with the proposed
method.
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