The snow cover winter 2009-2010 (left) and 2010-2011 (right) years compared to the average of the previous 30 years. Here and below, the difference is specified as a percentage. (Here and below the image Jiping Liu.)
An international team of researchers has discovered a new link between the melting ice in the Arctic and cold winter in the Northern Hemisphere. SUT $ $
Since 2007, the area in the summer ice of the Arctic Ocean reached a record low, the northern U.S., in the north-western and central Europe, as well as in northern and central China have from time to time there are unprecedented frosts. Winter 2009-2010 and 2010-2011 in the Northern Hemisphere were second and third in the recent history of the volume of snow, respectively.
Judith Curry of the Georgia Institute of Technology (USA) and her colleagues analyzed data from the 1979-2010 years, and found that the reduction in autumn Arctic sea ice at one million miles? coincides with heavy winter snowfall in these areas.
The researchers believe that this relationship can be explained by two factors — the change of atmospheric circulation and changes in the concentration of water vapor in the atmosphere. Ice goes, reflective of the Arctic Ocean is reduced, the water absorbs more heat. This leads to a weakening of the westerly winds, strengthening jet stream in the atmosphere and an increase in the final amount of moisture. All this increases the rate of formation of atmospheric blocks, which in turn contribute to the movement of air masses in the middle and lower latitudes.
Computer simulation and indeed showed that the reduction in the mass of Arctic ice would lead to a warming of the surface of the Arctic Ocean, as well as in Greenland and the north-eastern Canada. At the same time in the north of North America, Europe, Siberia and East Asia should expect cold weather and snowfall.
This is not the first study to show the link between global warming and the unusually cold and snowy winters in the Northern Hemisphere.
Moreover, scientists have linked not only with the cold ice melting, but with the game Atlantic currents.
Concentration of Arctic sea ice in winter (A) 2007-2008, (B) 2008-2009, (C) 2009-2010, and (D) 2010-2011 period, compared to the average of the previous 30 years.
The incidence of air units in recent years compared to the average of previous years.
The study is published in the journal Proceedings of the National Academy of Sciences.
Prepared according to the Georgia Institute of Technology.