© Tohoku UniversityA map view of P wave velocity tomography at 5 km depth beneath Greenland and surrounding regions (left). Blue and red colors denote high and low velocity perturbations, respectively, whose scale (in %) is shown beside the map. The white dotted lines are the thermal tracks of Iceland and Jan Mayen plumes that are affected by the Greenland plume. The area surrounded by the black dotted lines is where the flow, caused by melting at the bottom of the ice sheets, exists (Northeast Greenland Ice Stream); its water source is located at the intersection of the two heat tracks. A vertical cross-section of whole-mantle tomography passing through central Greenland and Jan Mayen (right). We can see that the Greenland plume is the heat source for the Jan Mayen volcano.
"Newly Discovered Greenland Hot Rock Mantle Plume Drives Thermal Activities in the Arctic," reads the title.
"A team of researchers 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 (emphasis added).
"The results of their two-part study were published in the Journal of Geophysical Research.
Comment: Also relevant: Earth's hot core, not global warming, responsible for Greenland's melting ice sheet