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.
The rise in global mean sea level (GMSL) is a critical indicator of climate change. Hong Kong Polytechnic University (PolyU) researchers have utilized advanced space geodetic technologies to deliver the first precise 30-year ...
Earth Sciences
Sep 1, 2025
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In recent years, Pacific island nations have earned global credibility as champions of climate action. Pacific leaders view sea level rise as an existential threat.
Earth Sciences
Sep 1, 2025
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Small island nations such as Tuvalu, Kiribati, the Maldives and Marshall Islands are particularly vulnerable to climate change. Rising seas, stronger storms, freshwater shortages and damaged infrastructure all threaten their ...
Environment
Aug 28, 2025
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Global sea-level change has now been measured by satellites for more than 30 years, and a comparison with climate projections from the mid-1990s shows that they were remarkably accurate, according to two Tulane University ...
Earth Sciences
Aug 22, 2025
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According to the 35th annual State of the Climate report, greenhouse gas concentrations, the global temperature across land and oceans, global sea level, and ocean heat content all reached record highs in 2024, and glaciers ...
Environment
Aug 14, 2025
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By 2080, rising sea levels could cause seasonal waves to reach Ahu Tongariki, the iconic ceremonial platform that is part of the Rapa Nui National Park, a UNESCO world heritage site, according to a study published in the ...
Earth Sciences
Aug 12, 2025
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An international study by marine scientists based in Singapore has revealed that sea-level rise in the Indian Ocean began accelerating far earlier than previously thought, with corals providing an unbroken natural record ...
Earth Sciences
Aug 12, 2025
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A recent study in Nature Geoscience offers important new insights into the hidden role of ancient groundwater beneath the ocean floor—and how it may have interacted with ice sheets and rising sea levels during past climate ...
Earth Sciences
Aug 6, 2025
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Recent climate-related crises—from severe storms and flooding to extreme heat—have raised new questions about how local governments communicate the risk of these crises and what they are doing to keep their citizens safe. ...
Earth Sciences
Jul 30, 2025
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In the village of Nagigi, Fiji, the ocean isn't just a resource—it's part of the community's identity. But in recent years, villagers have seen the sea behave differently. Tides are pushing inland. Once abundant, fish are ...
Environment
Jul 24, 2025
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