"Alastair McDonald" wrote in message
...
Weather extremes provoked by trapping of giant waves in the atmosphere
02/2572013 - The world has suffered from severe regional weather extremes
in recent years, such as the heat wave in the United States in 2011 or the
one in Russia 2010 coinciding with the unprecedented Pakistan flood.
Behind these devastating individual events there is a common physical
cause, propose scientists of the Potsdam Institute for Climate Impact
Research (PIK). The study will be published this week in the US
Proceedings of the National Academy of Sciences and suggests that man-made
climate change repeatedly disturbs the patterns of atmospheric flow around
the globe's Northern hemisphere through a subtle resonance mechanism.

http://www.pik-potsdam.de/news/press...the-atmosphere

"Scientists were surprised by how far outside past experience some of the
recent extremes have been. The new data show that the emergence of
extraordinary weather is not just a linear response to the mean warming
trend, and the proposed mechanism could explain that."

It sounds as if progress is being made in linking weather and climate
change.


I would concur with their findings in terms of long periods of the same type
of weather. I have noticed this trend over the years. Gone are the days in
summer of "3 fine days and a thunderstorm". Instead we either get 60 days of
wet or 60 days of dry, I exagerrate but you get the drift. A good and
interesting study into Rossby wave behaviour in our modern climate. Also
amplifying Rossby waves will exacerbate or even trigger SSWs due to
breaking at the tropopause. This year's exceptionally strong one would link
in with their work too. Thanks.

Will
--
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
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