Geology

More Evidence for Glaciers melting from below in Greenland

Heat loss from the Earth's interior Young Sound fjord in northeast Greenland. Image: Newsweak.com

Heat loss from the Earth’s interior. Young Sound fjord in northeast Greenland. Image: Newsweek.com

Comment AEC: Some glaciers around the world have been receding, while at the same time, temperature was constant of decreasing, land locked Antarctic ice sheets are growing. while Arctic sea ice had been officially receding until recent years.

In 2015, we learned that “Heat From Deep Ocean Fault Punches Hole in Arctic Ice Sheet”. By now, also Antarctic ice shelves are affected by heat from below. In 2017, scientists “discover 91 volcanoes below Antarctic ice sheet”.

New research published in Scientific Report now reviles that also Greenland ice cover has been affected by heat sources from below. (Keep in mind, the actual degree of loss of ice in recent years is a highly politically charged issue and was repeatedly shown to be subject to data manipulation committed by proponents of the theory of anthropogenic climate change.)

 

Newsweek.com BY

PUZZLING HEAT FROM DEEP INSIDE THE EARTH IS MELTING GREENLAND’S GLACIERS

Scientists already know that the Greenland ice sheet is melting. But the hidden heat source originating from deep inside the Earth partially responsible for that melting has been a mystery. Now, researchers have pinned down evidence of that heat, revealing yet another force pushing glaciers into the ocean.

SØREN RYSGAARD

For more than a decade, researchers have measured temperatures and saltiness in the Young Sound fjord at depths of 650 to 1,100 feet. Fjords are deep, U-shaped valleys connected to the sea and formed by glacial erosion. The region in which the Young Sound fjord is located is filled with hot springs, where water can reach 140 degrees Fahrenheit.

Similar to Iceland, according to the researchers, a significant amount of geothermal activity is bubbling beneath the Earth’s surface in Greenland. The heat loss radiating from the geothermal activity of the Earth’s interior is melting glaciers from below—making it easier for them to slide into the sea, adding to sea level rise.

“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 northeastern corner of Greenland,” Søren Rysgaard, lead author from the bioscience department at Aarhus University said in a statement. The findings published Monday in Scientific Reports, by researchers also at Arctic Research Centre and the Greenland Institute of Natural Resources, will help to improve predictions of sea level rise as well as the stability of the Greenland ice sheet.

WIETER BOONE

The combination of rising temperatures in the air and sea, precipitation from above, particular dynamics of the ice sheet and now heat loss from the Earth’s interior is causing the Greenland ice sheet to lose its mass, according to Rysgaard. The Earth’s interior heat loss causes deep sea temperatures in the fjords to warm up, which results in yet another source of glacial melting.

This source of heat—scientifically known as the geothermal heat flux—is found all over the planet and dates back to Earth’s formation, according to co-author, Jørgen Bendtsen, of Aarhus University. Geothermal heat fluxes are difficult to measure and aren’t distributed evenly across the planet, so “our results are very unique because we determine the relatively small heat flux from a decade-long warming of an almost stagnant water mass,” Bendtsen told Newsweek by email. 

The warming and melting from below the ice sheets caused by these heat fluxes “lubricates the interface between the ice and the ground resulting in a much faster ice flow,” Bendtsen said. The speed of the ice flow—meaning, how quickly glaciers slide into the sea—can increase from this warmth beneath them.

 

 

 

 

 

 

 

 

Categories: Geology, Recently, Vulcano

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