Jakobshavn Glacier, one of the fastest melting of ice masses in the world, surprised his followers by NASA scientists. After more than 20 years of decline – suddenly it started to grow. Researchers believe that a trend change is temporary.
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The researchers found that the fastest melting glaciers in Greenland began in 2016 unexpectedly gaining in thickness, and his forehead – and not retreat internal – extends into the ocean.
Although Jakobshavn continues to lose mass and promotes the growth of global sea level – a reserve of publication in «Nature Geoscience» – this is happening at a much slower pace.
Ala Khazdendar charge of auditing the Jet Propulsion Laboratory of NASA (JPL) admits that he and his colleagues were shocked by the sudden return of the processes occurring in the glacier.
"At first we could not believe we have assumed that the Jakobshavn will behave the same way and for the past 20 years", – says the researcher.
Data from NASA's mission "Oceans melting of the Greenland» (OMG) has shown that for three consecutive years (from 2016). Water around the forehead of the glacier was colder than expected. Their temperature is now the lowest since the mid-80s.
Scientists believe that the cooling of the ocean due to changes in the North Atlantic Oscillation (IDA). This meteorological with & # 39; reality that makes every 5-20 years, the North Atlantic cooled and cyclical warming. He recently entered the phase of cool.
If they are right, it means that the slowdown in Jakobshavn glacier melting with & # 39 is temporary. If March comes again in the warm phase, the disappearance of ice is likely to accelerate again.
". Jakobshavn makes a temporary break, but in the long term in the warmer ocean and seeing how great the influence of the oceans may have on the glaciers, it means bad news for the Greenland ice sheet, "- says working for the mission OMG Josh Willis from the Jet Propulsion Laboratory.
Climate warming increases the risk of melting glaciers in the world, but there are many factors that can speed up or slow down the melting of it. "For example, it is very important to the & # 39 is the shape of the land beneath the glacier (…) We have shown that the temperature of the ocean can be as important," – said Khazendar.
Jakobshavn is located on the west coast of Greenland, and it flows into the ocean from approx. 7 per cent. Greenland ice. Because of its size and the potential for sea-level rise for many years under the supervision of NASA.
Its decay is greatly accelerated in the early twenty-first century, when the ice shelf lost. The loss of ice in the years 2000-2011 led to an increase in the level of the seas and oceans in the world, with 1 mm.