energy. The
average net downward shortwave radiation flux at the Earth’s surface during July – August 2008
was found to be 122 W m 2. With a sun altitude angle of 28.86 degrees at solar noon on 1 Au-
gust 2008, the net shortwave radiation flux, rescaled to the central latitude of Iceland (65 N), is
given by
178 W m 2, and is therefore within the range of overcast and clear-sky values over the
snow
/media/vedurstofan/utgafa/skyrslur/2015/VI_2015_006.pdf