Trends in Downward Solar Radiation at the Surface over North America from Climate Model Projections and Implications for Solar Energy
(a) The July climatology of total cloud fraction from the 21st century run with GFDL CM2.0, based on 2080–2100 average. (b) The same as (a) but from the 20th century run, based on 1980–2000 average. (c) The trend, defined as (a) minus (b). The color scales with units in percentage are shown on the right.