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Some Weather Extremes are Real, but Causes are Natural by Joseph D’Aleo
Sunday, October 3rd 2010, 9:49 AM EDT
Co2sceptic (Site Admin)
Image AttachmentWe have had some extreme conditions the last few years – of cold, heat, snow and rain. Detailed summaries on the cold last winter can be found here and on the hot summer here. Both were memorable seasons indeed. Though the second author did an excellent job detailing the summer records and did mention the amplified and frozen jet stream, he went on to say man made global warming contributed to it.

Whereas the media and alarmists like to portray extremes (Holdren has called it “Climate Disruption”) as the result of or greatly amplified by man made greenhouse gases, natural factors can be shown as the cause. Too many scientists and media ‘enviro’ bloggers have stated “it must be man-made – what else could it be?”

THE ROLE OF THE SUN

The sun is the major driver for climate. The variations in the sun including irradiance, ultraviolet warming through ozone chemistry, galactic cosmic ray diffusion through the solar wind cause variations in the earths atmospheric and surface temperatures, changes in the jet stream and affect the tendency for blocking events. The sun is a factor probably through its effect on blocking also in how persistent patterns are which leads to anomalies to build for the seasons. The actual anomalies vary year to year with other factors such as ENSO and the state of the ocean multidecadal cycles – PDO and AMO.

As New Scientist magazine recently reported “Mike Lockwood at the University of Reading, and Joanna Haigh of Imperial College London have found that although the sun’s brightness does not change much during solar maxima and minima, the type of radiation it emits does. During maxima the sun emits more ultraviolet radiation, which is absorbed by the stratosphere. This warms up, generating high-altitude winds…a stronger jet stream. The reverse is true in solar minima, and the effect is particularly evident in Europe, where minima increase the chances of extreme weather. Indeed, this year’s cold winter and the Russian heat wave in July have been linked to the sun’s current lull, which froze weather systems in place for longer than normal.”

CLICK to download PDF file and read FULL report from Joseph D’Aleo
Source Link: scienceandpublicpolicy.org
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