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Post date: Apr 15, 2010 5:18:42 PM
SUN CONTROL
The Sun magnetic field is as low as in 17th century with extreme cold winters in Europe
Global warming not touched by magnetic low
source: news.bbc.co.uk
Sun activity link to cold winters
Maunder Minimum low magnetic
Sun activity leads to cold Europe
The UK and northern Europe
could be gripped by more frequent cold winters as a result of
low solar activity, say researchers.
Europe is particularly susceptible because it lies underneath the jet stream
Mike Lockwood, professor of space environment physics at the University of Reading, UK.
Jet Stream in disorder due to magnetic low or general climate change ?
This affects the dynamics of jet streams, which are very strong winds about 7-12km above the Earth's surface that can have a major influence on weather systems. There is one jet stream present in each hemisphere.
Blocking of Jet stream"Europe is particularly susceptible because, firstly, it lies underneath the (northern hemisphere's) jet stream," he explained. A "blocking" occurs when the jet stream forms an "s" shape over the north-eastern Atlantic, causing the wind to fold back over itself. "If you haven't got blocking, then the jet stream brings the mild, wet westerly winds to give us the weather we are famous for." But, he added, if the jet stream is "blocked", and pushed further northwards, then cold, dry winds from the east flow over Europe, resulting in a sharp fall in temperatures. "This... 'blocking' does seem to be one of the things that can be modulated by solar activity," he said.
UV Radiation levels
The way in which solar activity affects the behaviour of blocking episodes is linked to the amount of ultraviolet (UV) emissions being produced by the Sun.
Solar UV heats the stratosphere (20-50km above the surface), particularly the equatorial stratosphere. This results in a temperature gradient, which leads to the formation of high level winds.
Comment:
The depletion of the Ozone layer over years, or the Ozone hole,
means less heating up by UV of the upper Stratosphere
(UV radiation reaches the Ocean and glaciers through the ozone hole, shock heating them) This results in a lower temperature gradient, which leads to the formation of less high level winds.
Worth thinking about this possible cause of cold winters, less Jet stream by Ozone hole
Related:
Climate chaos ?
Why not drop the "speculation" and say, as we can with assurance, that in the 21st century a warming ocean and atmosphere means increasing overall variability with a far greater chance of climate chaos?
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