Quantification of the effect of urbanization on solar dimming

Details Quantification of the effect of urbanization on solar dimming Quantification of the effect of urbanization on solar dimming

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3508801a&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 8, CiteID L08801

Physics

Optics

10

Atmospheric Composition And Structure: Radiation: Transmission And Scattering, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Optics, Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Radiative Processes

Scientific paper

During the 25-year period (1964-1989), a noticeable decline in surface solar radiation, termed global dimming, over worldwide sites was essentially a local phenomenon associated with human activity as expressed by the sites' population density. Specifically, our findings indicate that solar dimming was observed only over a limited part (~30%) of the total land area, restricted to highly-populated sites with population density higher than 10 person/km2. Dimming was dominated by anthropogenic aerosol emissions: the decline in surface solar radiation intensified from -0.05 W/m2/yr to -0.32 W/m2/yr, with population density increasing from 10 to 200 person/km2. At sites with population density >200 person/km2, a saturation effect was observed: declining trends were much less pronounced than those over sites with a lower population density. Overall, it is demonstrated that urban areas obtained less solar radiation, compared to rural areas, in the amount of ~12 W/m2 which is equivalent to about 8%.

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