Earth's heat loss pushing Greenland's ice sheet towards sea

London, Jan 23: Researchers have found that the loss of heat that comes up from the interior of the Earth melts the Greenland’s ice sheet from below and triggers the sliding of glaciers towards the sea.

Greenland’s ice sheet is becoming smaller and smaller. The melting is taking place with an increased strength and at a speed that no models have previously predicted. As a result, the deep bottom water of the north-eastern Greenland’s fjords is also warming up, the research showed.

“North-East Greenland has several hot springs where the water becomes up to 60 degrees warm and, like Iceland, the area has abundant underground geothermal activity,” said Soren Rysgaard, Professor at the Aarhus University in Denmark. In the study, the team focussed on an isolated basin in the fjord with a depth range between 200 and 340 metre and measured how the deep water is heated over a 10-year period.  If the Earth releases heat to a fjord, heat also seeps up to the bottom part of the glaciers. This means that the glaciers melt from below and thus slide more easily over the terrain on which they sit when moving to the sea, the researchers said. “There is no doubt that the heat from the Earth’s interior affects the movement of the ice, and we expect that a similar heat seepage takes place below a major part of the ice cap in the north-eastern corner of Greenland,” explained Soren Rysgaard from the varsity. (IANS)