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Politics : Formerly About Advanced Micro Devices
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To: i-node who wrote (877036)8/1/2015 1:19:22 AM
From: Wharf Rat  Read Replies (1) of 1576826
 
"It is getting warmer," which we now know, of course, yes, it was, but I don't see any article explaining why it started cooling a few years later and cooled for several decades thereafter."

Mostly our smog. Also some volcanic eruptions.

The mid-century cooling appears to have been largely due to a high concentration of sulphate aerosols in the atmosphere, emitted by industrial activities and volcanic eruptions. Sulphate aerosols have a cooling effect on the climate because they scatter light from the Sun, reflecting its energy back out into space.

The rise in sulphate aerosols was largely due to the increase in industrial activities at the end of the second world war. In addition, the large eruption of Mount Agung in 1963 produced aerosols which cooled the lower atmosphere by about 0.5°C, while solar activity levelled off after increasing at the beginning of the century







The clean air acts introduced in Europe and North America reduced emissions of sulphate aerosols. As levels fell in the atmosphere, their cooling effect was soon outweighed by the warming effect of the steadily rising levels of greenhouse gases. The mid-century cooling can be seen in this NASA/GISS animation, which shows temperature variation from the annual mean for the period from 1880 through 2006. The warmest temperatures are in red.

newscientist.com
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