Greenland's ice sheet behaves like a boiling pot of pasta
In short: Beneath nearly two miles of ice, Greenland's frozen landscape is churning. Scientists have discovered that parts of the ice sheet undergo thermal convection, moving in a process similar to the hot rock in Earth's mantle. This discovery challenges our understanding of ice as a static, solid material.
The Greenland Ice Sheet, the world's second-largest ice sheet, covers 80% of the island and reaches thicknesses of nearly 3.2 kilometers. While it appears to be a solid mass, researchers have identified vast structures known as "plumes" beneath the surface. A study published in the journal Cryosphere suggests these plumes are caused by thermal convection—where temperature differences cause hot material to rise and cool material to fall—creating a cycling motion similar to a boiling pot of pasta.
Such internal shifts suggest that sections of the glacier might possess a lower density than formerly assumed. Grasping these mechanics is vital given that the frozen expanse covers over 650,000 square miles. Scientists estimate that if the entire sheet were to melt, it could raise global sea levels by approximately 24 feet. While the discovery does not necessarily mean the ice will melt faster, it provides essential clues for modeling how the mass balance will change as the climate warms.
The ice also acts as a geological time capsule. In 2019, scientists examined a 15-foot-long tube of sediment pulled from nearly a mile deep in 1966. They discovered perfectly preserved twigs and leaves, suggesting that most, or all, of Greenland was ice-free within the last million years—and possibly as recently as a few hundred thousand years ago. This confirms that the ice sheet is highly vulnerable and has melted entirely during previous warm periods in Earth's history.
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Sources
- Summary by Intellect · source: Scientists Stunned To Discover What's Hidden Under The Ice In Greenland
- Also: Scientists stunned to discover plants beneath mile-deep Greenland ice | ScienceDaily
- Also: Scientists may have just solved one of the strangest mysteries of Greenland’s ice sheet | Scientific American
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