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Friday, 29 November 2013 00:00

Demonstrated effectiveness of greenhouses to counter global warming

The study offers a geophysical explanation of the phenomenon, based on a climate model developed through the use of powerful supercomputers in the Department of Energy of the United States.

Paul Campra, a scientist from Almería, who belongs to one of the research groups Agrifood Campus of International Excellence ceiA3, has published paper in the American Journal Environmental Science & Technology, showing that the greenhouses of Almeria counteract global warming.

In this research he explains that these greenhouses are able to generate a local temperature cooling through the reflection of sunlight by plastic covers.

This phenomenon of weather modification by high solar reflectance in Almeria’s protected agriculture was discovered by Paul Campra in 2008. He named it the "albedo effect".

The simulation was carried out by a complex computer model and it shows that the average reduction in peak summer temperatures of more than 0.4 degrees can reach more than 1.3 on very hot days.

After analyzing the historical temperature records of Campo de Dalías, in Almería, Campra showed that, despite global and regional warming of more than 0.4 degrees per decade in southern Spain, mean annual temperatures of this agricultural region "not only had not increased in the last 30 years, but showed a pronounced cooling trend of minus 0.3 degrees per decade".

The study offers a geophysical explanation of the phenomenon, based on a climate model that was  through the use of powerful supercomputers in the Department of Energy of the United States, during a stay carried out by Campra at Lawrence Berkeley National Laboratory, at the University of Berkeley, in California.

The research was supported by the Department of Energy of the United States, where the phenomenon of cooling by surface reflectance in Almería stirred great interest, since its application in metropolitan areas by whitewashing ceilings and floors, would considerably reduce summer temperatures, energy consumption, and pollution.

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