Global dimming or local dimming? Effect of urbanization on sunlight availability

Pinhas Alpert*, Pavel Kishcha, Yoram J. Kaufman, Rotem Schwarzbard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

158 Scopus citations


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/m2/yr for highly populated sites compared to only 0.16 W/m2/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°N to 40°N with great industrial activity. In the equatorial regions even the opposite trend to dimming is observed for sparsely populated sites.

Original languageEnglish
Article numberL17802
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Issue number17
StatePublished - 16 Sep 2005


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