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.
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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When polar ice sheets melt, the effects ripple across the world. The melting ice raises average global sea level, alters ocean currents and affects temperatures in places far from the poles.
Environment
Nov 25, 2025
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80
A University of Houston scientist has teamed with international partners to examine how Antarctica's massive glaciers are shifting and how that could predict sea level changes. Their latest collaboration offers the most precise ...
Earth Sciences
Nov 24, 2025
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As a result of climate change, rising sea levels are threatening low-lying coastal areas around the world, such as the Wadden Sea in the North Sea. Tidal basins form a natural protective barrier there. They connect the mainland ...
Earth Sciences
Nov 21, 2025
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35
If heat-trapping pollution from burning coal, oil and gas continues unchecked, thousands of hazardous sites across the United States risk being flooded from sea level rise by the turn of the century, posing serious health ...
Earth Sciences
Nov 20, 2025
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139
Water levels are creeping upward on shorelines across the world, and decision-making systems are not keeping up. One barrier to including sea level rise projections in adaptation plans is limited information on the full range ...
Earth Sciences
Nov 18, 2025
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Researchers at the University of California, Irvine and NASA's Jet Propulsion Laboratory have identified stormlike circulation patterns beneath the Antarctic ice shelves that are causing aggressive melting, with major implications ...
Earth Sciences
Nov 18, 2025
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114
Arctic coastlines are falling into the sea. Wave action, rising sea levels, and thawing permafrost are all contributing to the massive erosion that has forced whole towns to move farther from the water's edge.
Earth Sciences
Nov 17, 2025
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34
Groundwater rise as a result of climate change poses a significant threat to coastal cities, says University of Rhode Island assistant professor of geosciences Christopher Russoniello. Russoniello and colleagues recently ...
Earth Sciences
Nov 13, 2025
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In the summer of 2022, 20 islands in the Maldives were flooded when a distant swell event in the Indian Ocean coincided with an extremely high tide level.
Earth Sciences
Nov 13, 2025
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