nuclear-news

[T]he probability of cold winters with much snow in Central Europe rises when the Arctic is covered by less sea ice in summer. Scientists of the Research Unit Potsdam of the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association have decrypted a mechanism in which a shrinking summertime sea ice cover changes the air pressure zones in the Arctic atmosphere and impacts our European winter weather. These results of a global climate analysis were recently published in a study in the scientific journal Tellus A.

That’s the news release for yet another new study examining what will inevitably be the huge implications for extreme weather from the massive amount of heat released by the declining Arctic sea ice cover. Arctic sea ice in September 2007 reached its lowest extent on record, approximately 40% lower than when satellite records began in 1979. Sea ice loss in 2011 was virtually tied with the ice loss in 2007, despite weather conditions that were not as unusual in the Arctic. ”Such a large area of open water is bound to cause significant impacts on weather patterns, due to the huge amount of heat and moisture that escapes from the exposed ocean into the atmosphere over a multi-month period following the summer melt.”  

You may recall the recent repost of the discussion by meteorologist Dr. Jeff Masters (see “Our Extreme Weather: Is Arctic Sea Ice Loss Partly to Blame?” the source of the figure above):

“The question is not whether sea ice loss is affecting the large-scale atmospheric circulation…. It’s how can it not?” That was the take-home message from Dr. Jennifer Francis of Rutgers University, in her talk “Does Arctic Amplification Fuel Extreme Weather in Mid-Latitudes?”, presented at last week’s American Geophysical Union meeting in San Francisco.

Dr. Francis presented new research in review for publication, which shows that Arctic sea ice loss may significantly affect the upper-level atmospheric circulation, slowing its winds and increasing its tendency to make contorted high-amplitude loops. High-amplitude loops in the upper level wind pattern (and associated jet stream) increases the probability of persistent weather patterns in the Northern Hemisphere, potentially leading to extreme weather due to longer-duration cold spells, snow events, heat waves, flooding events, and drought conditions.

The new German study looks at the specific case of winters in central Europe.  The UK Independent storyexplains, “A growing number of experts believe complex wind patterns are being changed because melting Arctic sea ice has exposed huge swaths of normally frozen ocean to the atmosphere above.”

As cold weather hit much of Europe, the story describes the findings this way:

In particular, the loss of Arctic sea ice could be influencing the development of high-pressure weather systems over northern Russia, which bring very cold winds from the Arctic and Siberia to Western Europe and the British Isles, the scientists believe. An intense anticyclone over north-west Russia is behind the bitterly cold easterly winds that have swept across Europe and some climate scientists say the lack of Arctic sea ice brought about by global warming is responsible.

“The current weather pattern fits earlier predictions of computer models for how the atmosphere responds to the loss of sea ice due to global warming,” said Professor Stefan Rahmstorf of the Potsdam Institute for Climate Impact Research. “The ice-free areas of the ocean act like a heater as the water is warmer than the Arctic air above it. This favours the formation of a high-pressure system near the Barents Sea, which steers cold air into Europe.”…….

I added “for now” to the subhed “Less Summer Arctic Sea Ice Cover Means Colder, Snowier Winters in Central Europe” because if we stay on our current emissions path, then the warming is going to be so great in the second half of the century it will generally overcome even these cold blasts……

http://theenergycollective.com/josephromm/75958/climate-change-bringing-arctic-europe?utm_source=tec_newsletter&utm_medium=email&utm_campaign=newsletter