Zusammenfassung
We have analyzed the variability of solar radiation in the Mediterranean
and Black Sea regions by comparing yearly and monthly averages to
long-term average values calculated from the HelioClim-1 database.
Daily sums of global horizontal irradiation are considered for 18
years in the period 1985-2004. Standard deviation of yearly sums
of global horizontal irradiation shows low interannual variability,
being mostly in the range of 4% to 6%. While in arid climate of Northern
Africa, Middle East, and Southern Europe standard deviation goes
below 4%, values up to 10% are identified along coasts and in mountains.
In the least sunny year out of 18, the solar resource was generally
never more than 9% below the long-term average, and only in a few
regions the radiation deficit reached 15%. The most stable weather
is found in summer with standard deviation in June below 12%. The
least stable season is winter, with variability higher then 20% in
December, and regionally going above 35%. The solar resource has
distinctive time and geographical patterns that might affect financing
of large photovoltaic systems, as well as management of the distributed
electricity generation.
Nutzer