Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 32, Issue 17, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL023320
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From the 1950s to the 1980s, a significant decrease of surface solar radiation has been observed at different locations throughout the world. Here we show that this phenomenon, widely termed global dimming, is dominated by the large urban sites. The global-scale analysis of year-to-year variations of solar radiation fluxes shows a decline of 0.41 W/m(2)/yr for highly populated sites compared to only 0.16 W/m(2)/yr for sparsely populated sites (<0.1 million). Since most of the globe has sparse population, this suggests that solar dimming is of local or regional nature. The dimming is sharpest for the sites at 10 degrees N to 40 degrees N with great industrial activity. In the equatorial regions even the opposite trend to dimming is observed for sparsely populated sites.
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