Sea-level change refers to temporal variations in the height of the global or regional ocean surface relative to a reference datum, driven by combined effects of eustatic, isostatic, and steric processes. Eustatic change primarily arises from alterations in ocean mass, notably through glacial–interglacial ice-sheet dynamics and contemporary land ice melt. Isostatic and tectonic processes modify the vertical position of the solid Earth, producing relative sea-level change at specific locations. Steric contributions reflect temperature- and salinity-driven density changes that alter ocean volume. Quantifying sea-level change integrates tide-gauge records, satellite altimetry, gravimetry, and glacial isostatic adjustment models for reconstructing past variability and constraining projections.
A July 2025 report from the U.S. Department of Energy (DOE) claims that U.S. tide gauge measurements "in aggregate show no obvious acceleration in sea level rise beyond the historical average rate." However, a new study by ...
Earth Sciences
Dec 17, 2025
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Salt marshes, those critical habitats that protect coastal towns from flooding, store massive amounts of blue carbon, support fisheries and play a key role in ecological resilience, are struggling to survive as oceans rise ...
Earth Sciences
Dec 16, 2025
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On many days, Apple Street looks like a picture postcard of New England. Oaks shade a time-worn stone wall, boat sheds loll behind granite outcrops. But during storms, this pretty lane only a few feet above sea level can ...
Environment
Dec 11, 2025
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If it were to melt completely, the vast West Antarctic Ice Sheet (WAIS) holds enough ice to raise the global sea levels by 4 to 5 meters (13 to 16 feet).
Earth Sciences
Dec 11, 2025
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In an age of rising sea levels, as polar ice sheets melt in a climate warmed by fossil fuel emissions, climate modelers are racing to understand what the future might hold for coastlines around the world. But uncertainties ...
Earth Sciences
Dec 11, 2025
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The Greenland and Antarctic ice sheets are highly vulnerable to global warming and scientists are being increasingly worried about the possibility of large parts of the ice sheets collapsing, if global temperatures keep on ...
Earth Sciences
Dec 9, 2025
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A new study led by researchers at the University of Ottawa provides a series of highly detailed 3D models of the Earth's temperature beneath Greenland and northeastern Canada, providing insights into the region's geological ...
Earth Sciences
Dec 8, 2025
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The speed at which glaciers move changes predictably each year, according to the first-ever global map of how glacier and ice sheet speeds vary with the seasons. Knowing this yearly rhythm could help us better predict sea-level ...
New research shows how the combination of extreme climate events, sea-level rise and land subsidence could create larger and deeper floods in coastal cities in future.
Earth Sciences
Dec 2, 2025
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48
Canada has a marine coastline twice as long as any other country and shares four Great Lakes with the United States. A new report warns that without coordinated planning, coastal communities face increasing flooding and erosion ...
Earth Sciences
Nov 25, 2025
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