U.S. East Coast February 11, 2010. Snapshot satellite Terra. (Image NASA MODIS Rapid Response Team / Jeff Schmaltz.)
If the Atlantic warms, it can lead to a stalemate in North America and Europe. The point is, that this or that weather will last longer than they should, and eventually will flood some places the rain (or fill up with snow), while others wither.
As we have already mentioned in connection with last year's Russian heat, this situation by changing the course of so-called atmospheric jet streams — high-altitude winds blowing strongly. Because of this huge air masses that they had to pick up, remain standing in one spot. On jet streams always something affects, and that here and there the air is stagnant — sometimes for five days. But sometimes there is an anomaly, able to hold out for several weeks (as in "native" If we-2010). Latest aptly called blocking (blocking event).
In the North Atlantic, such blocking usually occur over Greenland and Western Europe. In the winter of 2009-2010, when Britain and the eastern United States is filled up and covered with snow, this is what happened. Many ordinary people then finally decided that global warming — a myth.
Not likely, said oceanographer Sirpa Hyakkinen Space Flight Center NASA. Goddard (USA) and his colleagues. Analysis of atmospheric data for XX century, a correlation between periods of warming waters of the North Atlantic and the increase of atmospheric blocking.
The researchers ruled out the effects of global warming and found that the lock happened 30% more in 1930, 1960, and with the end of the 1990s to the present. During these periods the North Atlantic Ocean was warmer than usual due to natural causes.
Initial hypothesis that blocking is the North Atlantic Oscillation, had to be discarded, because from 1996, this climatic phenomenon does not manifest itself, and the lock is still the case.
The most interesting is that the coincidence of several locks can knock off the usual course of Atlantic hurricanes, and this in turn will lead to a shift in ocean currents, or to change their speed. If a large-scale water circulation will slow down, weaken, to the north will get the excess heat and more saline water. Intensify erosion base of glaciers, accelerated melting of Greenland, there is a change in the sub-polar ecosystems.
Black and blue denotes the number of winter lock red — temperature variations in the North Atlantic. (The picture of the authors.)
The study is published in the journal Science.
Prepared according to NASA.