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 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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Greenland's largest glacier, Jakobshavn Glacier, may be edging closer to a critical threshold as meltwater runoff from the Greenland Ice Sheet accelerates in ways not seen in over a century, according to new research published ...
Scientists say they have drilled deeper than ever beneath the West Antarctic Ice Sheet, peering back millions of years to reveal signs it was once, at least in part, open ocean.
Earth Sciences
Feb 21, 2026
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A study led by the University of Barcelona and published in the journal Nature Communications shows that climate change has profoundly altered extreme episodes of melting in the Greenland ice sheet by making them more frequent, ...
Earth Sciences
Feb 21, 2026
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The Antarctic ice sheet does not behave as one single tipping element, but as a set of interacting basins with different critical thresholds. This is the finding of a new study by the Potsdam Institute for Climate Impact ...
Earth Sciences
Feb 18, 2026
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