Sea level rise projections for 2050
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Global Mean Sea Level Rise Projections for 2050
Recent research consistently projects a significant rise in global mean sea level (GMSL) by 2050, with estimates generally falling between 16 and 30 centimeters above 2020 levels. A quadratic model based on satellite data from 1993 to 2020 predicts a GMSL rise of 16.4 cm by 2050, with a likely range of 11.3 to 21.4 cm, aligning closely with the latest IPCC projections and other major assessments . Other studies using observation-based methods and empirical models also find that sea level rise by 2050 is likely to be near or even above the higher-end model projections, though there is still a wide range of uncertainty 54.
Contributions from Ice Sheets and Regional Variability
The melting of the Antarctic and Greenland ice sheets is a major driver of sea level rise. Empirical projections suggest that between 2021 and 2050, the Antarctic Ice Sheet could contribute 6–19 mm and the Greenland Ice Sheet 15–31 mm to global sea level rise. These changes can cause more pronounced sea level increases in lower latitude regions, where many major cities are located, due to regional geoid changes .
Regional and Local Projections: United States and Southeast Asia
For the United States, observation-based projections indicate that sea level rise along the coastlines could reach 0.25–0.3 meters (25–30 cm) by 2050, increasing the risk of flooding and inundation in major cities . In Southeast Texas, projections for 2050 range from 0.17 meters (17 cm) under the lowest scenario to 0.54 meters (54 cm) under medium to high emission scenarios, with significant implications for infrastructure and port systems . On the west coast of Peninsular Malaysia, projections estimate a rise of 8.77 to 14.29 cm by 2050 .
The Role of Vertical Land Motion (VLM) in Sea Level Rise Projections
Local factors such as vertical land motion (subsidence or uplift) can greatly affect relative sea level rise. In some US cities, especially in California, local subsidence can more than double the expected sea level rise by 2050 compared to regional estimates. In areas like Los Angeles and San Diego, uncertainties in projections can increase by up to 0.4 meters due to variable VLM, highlighting the need to include these local factors in planning and adaptation 98.
Extreme Sea Levels and Flood Risk
By 2050, rising sea levels are expected to make what are currently considered rare, extreme sea level events (such as the present-day 100-year flood) much more common, especially in the tropics. This will expose large populations and infrastructure to unprecedented flood risks unless adaptation measures are taken .
Methodologies and Uncertainties in Projections
Sea level rise projections rely on a combination of satellite altimetry, tide gauge records, and models that account for various contributing factors such as ice mass loss, thermal expansion, and terrestrial water storage. While methodologies have improved, uncertainties remain due to the complex interactions between these factors and the influence of local land motion 104.
Conclusion
By 2050, global mean sea level is projected to rise by approximately 16–30 cm, with regional and local variations depending on ice sheet contributions, emission scenarios, and vertical land motion. Major coastal cities and infrastructure are at increasing risk, emphasizing the urgent need for adaptation and resilience planning. Including local land motion and regional variability in projections is critical for accurate risk assessment and effective coastal management 1235+2 MORE.
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