Azara Blog: More effects creating global warming

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Date published: 2006/04/07

The BBC says:

Reduced air pollution and increased water evaporation appear to be adding to man-made global warming.

Research presented at a major European science meeting adds to other evidence that cleaner air is letting more solar energy through to the Earth's surface.

Other studies show that increased water vapour in the atmosphere is reinforcing the impact of man-made greenhouse gas emissions.

Scientists suggest both trends may push temperatures higher than believed.

But they say there is an urgent need for further research, particularly at sea.

Between the 1950s and 1980s, the amount of solar energy penetrating through the atmosphere to the Earth's surface appeared to be declining, by about 2% per decade.

This trend received some publicity under the term "global dimming".

But in the 1980s, it appears to have reversed, according to two papers published last year in the journal Science.

The decline in Soviet industry and clean air laws in western countries apparently reduced concentrations of aerosols, tiny particles, in the atmosphere.

These aerosols may block solar radiation directly, or help clouds to form which in turn constitute a barrier; or both effects may occur.

Nothing really new here, but obviously this is yet another effect that needs understanding better.

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