The number of foggy, misty and hazy days is diminishing across the continent, say scientists who have analysed the meteorological data. The researchers found this clearing of the air in the past 30 years may have amplified the warming of Europe. They report their findings in the journal Nature Geoscience.
The research was led by Robert Vautard at the Atomic Energy Commission, Gif sur Yvette, France. Since the 1970s, European temperatures have risen by about half-a-degree Celsius per decade. This warming rate is faster than the global mean change (roughly equal to 0.18C per decade) and the trend averaged over all the Earth's land (roughly equal to 0.27C per decade) during the same period.
The regional climate models used by scientists have failed to simulate the European experience, say Vautard and colleagues; and they point to legislation that has cleaned up Europe's air as the probable cause. This has limited the presence of the tiny particles, or aerosols, in the atmosphere which help trigger the low-visibility phenomena.
Posted on 29th January 2009
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