An ice sheet, as a geophysical substance, is a massive, contiguous body of glacial ice that covers more than 50,000 km² and is sufficiently thick (often >2–3 km) for its internal deformation and basal sliding to dominate flow dynamics. Composed primarily of recrystallized freshwater ice with embedded air bubbles, dust, and minor impurities, it exhibits anisotropic rheological behavior described by non-Newtonian creep laws (e.g., Glen’s flow law). Ice sheets thermally stratify between cold and temperate regimes, store the majority of Earth’s terrestrial freshwater, and interact with bedrock and subglacial hydrological systems, influencing isostasy, basal lubrication, and large-scale mass balance.
Global sea levels may rise faster than previously expected, suggests a new study in Nature Communications. The reason is that warming oceans appear to be melting Antarctic ice shelves from below much more rapidly than expected.
Earth Sciences
May 7, 2026
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In a new paper, an international team led by scientists from Charles University, Czechia, has brought evidence linking widespread release of methane (CH₄)—a strong greenhouse gas—from the Greenland Ice Sheet (GrIS) to a warmer ...
Earth Sciences
May 5, 2026
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Models of glacial flow and retreat rely on estimates of glacial ice viscosity, the measure of the ice's resistance to flow. Ice viscosity is dependent on the stress applied to the glacier. Most ice sheet models use a standard ...
Earth Sciences
Apr 14, 2026
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A growing network of meltwater lakes at the edge of the Greenland ice sheet is accelerating the flow of major glaciers, potentially increasing the pace of global sea-level rise. Warmer air and sea temperatures have led to ...
Earth Sciences
Apr 1, 2026
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Global navigation satellite systems (GNSS), which include GPS, are traditionally used for positioning, timing, and mapping information. In an open-access study published Feb. 27 in Geophysical Research Letters, MIT Haystack ...
Earth Sciences
Mar 24, 2026
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New analyses of ancient ice from Antarctica and the air contained inside it are extending the history of Earth's climate records and expanding researchers' understanding of how the planet has changed over the last 3 million ...
Earth Sciences
Mar 18, 2026
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The future of one of Antarctica's most iconic glaciers could be far more dramatic than scientists previously thought. Using satellite calibrated ice sheet models, a team of researchers from the University of Edinburgh found ...
Melting glaciers and ice sheets are raising sea levels while the Arctic is poised to log one of its worst winters on record.
Environment
Mar 11, 2026
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An article published recently in Nature Geoscience warns that Antarctica's ice masses have begun to experience a process scientists call "Greenlandification." The term refers to the unprecedented retreat of Greenland's outlet ...
Earth Sciences
Mar 10, 2026
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A comprehensive 30-year study led by University of California, Irvine glaciologists has produced a circumpolar ice grounding line migration map of Antarctica. An amalgamation of three decades of satellite data compiled and ...
Earth Sciences
Mar 2, 2026
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