Abstract
This paper presents several maps of the annual Global Horizontal Irradiation, GHI, over Qatar, based on ground measurements of daily GHI for the period 2007-2012, from as many as 12 monitoring stations. Considering the longest coincident operation period of these stations, a map of 4-year averages from 2009 to 2012 was produced and yearly GHI variations with respect to this map are also presented, showing a maximum inter-annual variability of 6.5%. Moreover, a map produced with yearly values from the HelioClim1 database for the period 1985 to 2005 is shown and compared to the ground based map using the same locations. The ground-measured yearly average for Qatar is 2113 kWh/m2/year, calculated considering the 4-year period of coincident data.
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