"A team of researchers understands more about the melting of the Greenland ice sheet. They discovered a flow of hot rocks, known as a mantle plume, rising from the core-mantle boundary beneath central Greenland that melts the ice from below.

The results of their two-part study were published in the Journal of Geophysical Research.

"Knowledge about the Greenland plume will bolster our understanding of volcanic activities in these regions and the problematic issue of global sea-level rising caused by the melting of the Greenland ice sheet," said Dr. Genti Toyokuni, co-author of the studies.

The North Atlantic region is awash with geothermal activity. Iceland and Jan Mayen contain active volcanoes with their own distinct mantle plumes, whilst Svalbard - a Norwegian archipelago in the Arctic Ocean - is a geothermal area. However, the origin of these activities and their interconnectedness has largely been unexplored.

The research team discovered that the Greenland plume rose from the core-mantle boundary to the mantle transition zone beneath Greenland. The plume also has two branches in the lower mantle that feed into other plumes in the region, supplying heat to active regions in Iceland and Jan Mayen and the geothermal area in Svalbard.

Their findings were based on measurements of the 3-D seismic velocity structure of the crust and whole mantle beneath these regions. To obtain the measurements, they used seismic topography. Numerous seismic wave arrival times were inverted to obtain 3-D images of the underground structure. The method works similarly to a CT scan of the human body.

Toyokuni was able to utilize seismographs he installed on the Greenland ice sheet as part of the Greenland Ice Sheet Monitoring Network. Set up in 2009, the project sees the collaboration of researchers from 11 countries. The US-Japan joint team is primarily responsible for the construction and maintenance of the three seismic stations on the ice sheet.

Looking ahead, Toyokuni hopes to explore the thermal process in more detail. "This study revealed the larger picture, so examining the plumes at a more localized level will reveal more information." "

https://www.eurekalert.org/pub_releases/2020-12/tu-ndg120720.php

The earth is beginning to rumble.
The Oceans are rising, the ice is melting.
The fires are burning, the methane is seeping.
The Waves are getting bigger, the landslides longer.
Cites burn like fires at night, generating heat both day and night. 80% of Global Forests, Bushlands, Jungles and Woodlands have been decimated. Kelp Forests are vanishing. Plankton are becoming less. The air is thinning and we don't even know it as we poison it and compromise it. We are taking in more than is being replaced. Oxygen levels are probably down as well. A far cry from the quality atmosphere the Dinosaurs enjoyed. This world is dying.
Best give your money to NASA and get a seat to MARS to start the same crap all over again and ruin it as well, in any way or form.

Meanwhile people are living under the ocean and wondering what all the fuss is about?

LOL 

The plume has been there for tens of millions of years. It does not account for the rapid loss of ice sheet that has been a result of Global Warming.

Full marks for a desperate attempt to muddy the waters though! Bobby fell for it straight away. 

Bobby. wrote on Dec 9^th, 2020 at 11:41am:


It appears to have been unpopulated until Erik the Red landed.

"The name Greenland comes from Scandinavian settlers. In the Norse sagas, it is said that Erik the Red was exiled from Iceland for murder. He set out in ships to find land rumoured to be to the northwest. After settling there, he named the land Grfnland (Greenland), possibly to attract more people to settle there." Google search.

... wait ... there's more:

"Why is it called Iceland?
Iceland got its name when a Viking named Hrafna-Flóki ran up a mountain, saw a fjord full of icebergs, and called the country Iceland. The name stuck. Even though the rumor back then was that Iceland was so fertile that “butter dripped from every blade of grass.”

Captain Nemo wrote on Dec 9^th, 2020 at 8:35am:


Exactly.
The same argument has been used for the recent loss of ice on the Antarctic peninsular. Blaming volcanic vents that have been there thousands of years

Captain Nemo wrote on Dec 9^th, 2020 at 8:35am:



You have proof? Has it come out of new fractures in the rock? Interested people want to know.

perhaps you have link for your claim.

"A researcher from MIPT has proposed a new explanation for the Arctic's rapid warming. In his recent paper in Geosciences, he suggests that the warming could have been triggered by a series of great earthquakes.

Global warming is one of the pressing issues faced by civilization. It is widely believed to be caused by human activity, which increases the concentration of greenhouse gases in the atmosphere. However, this view does not explain why temperatures sometimes rise fairly abruptly.

In the Arctic, one of the factors driving climate warming is the release of methane from permafrost and metastable gas hydrates in the shelf zone. Since researchers began to monitor temperatures in the Arctic, the region has seen two periods of abrupt warming: first in the 1920s and '30s, and then beginning in 1980 and continuing to this day.

Leopold Lobkovsky, who authored the study reported in this story, is a member of the Russian Academy of Sciences and the head of the MIPT Laboratory for Geophysical Research of the Arctic and Continental Margins of the World Ocean. In his paper, the scientist hypothesized that the unexplained abrupt temperature changes could have been triggered by geodynamic factors. Specifically, he pointed to a series of great earthquakes in the Aleutian Arc, which is the closest seismically active area to the Arctic.

To test his hypothesis, Lobkovsky had to answer three questions. First, did the dates of the great earthquakes coincide with temperature jumps? Second, what is the mechanism that enables the lithospheric disturbances to propagate over more than 2,000 kilometers from the Aleutian Islands to the Arctic shelf region? Third, how do these disturbances intensify methane emissions?

The answer to the first question came from historical data analysis. It turned out that the Aleutian Arc was indeed the site of two series of great earthquakes in the 20th century (more details below the text). Each of them preceded an abrupt rise in temperature by about 15 to 20 years.

It took a model of lithospheric excitation dynamics to answer the second question. The model used by the researcher describes the propagation of so-called tectonic waves and predicts that they should travel at about 100 kilometers per year. This agrees with the delay between each of the great earthquake series and the subsequent temperature hike, as it took the disturbances 15 to 20 years to get transmitted over 2,000 kilometers.

To answer the third question, the researcher proposed the following explanation: The deformation waves arriving in the shelf zone cause minor additional stresses in the lithosphere, which are sufficient to disrupt the internal structure of the metastable gas hydrates and permafrost storing captured methane. This releases methane into the water of the shelf and atmosphere, leading to climate warming in the region due to the greenhouse effect.

"There is a clear correlation between the great earthquakes in the Aleutian Arc and the phases of climate warming. A mechanism exists for physically transmitting the stresses in the lithosphere at the appropriate velocities. And these added stresses are capable of destroying metastable gas hydrates and permafrost, releasing methane. Each of the three components in this scheme is logical and lends itself to mathematical and physical explanation. Importantly, it explains a known fact -- the abrupt rise in temperature anomalies in the Arctic -- which remained unaccounted for by the previous models," Lobkovsky commented.

According to the researcher, his model will benefit from discussion and will likely be improved, and there is much to be done in order to confirm or rule out the proposed mechanism."

https://www.eurekalert.org/pub_releases/2020-12/miop-ssg122320.php