A recent study by Zheng et al. in Science Advances highlights that global sea levels are rising at nearly double the rate observed in the 1960s, driven primarily by rising ocean temperatures and accelerating ice melt. Since 1960, sea levels have increased by an average of 2.06 millimeters per year, accelerating to 3.94 millimeters annually between 2005 and 2023.
Key findings reveal that:
- Ocean Warming: Contributes 43% to sea level rise by causing water expansion.
- Melting Ice: Accounts for the following contributions to sea level rise:
- Mountain glaciers: 27%
- Greenland Ice Sheet: 15%
- Antarctic Ice Sheet: 12%
- Changes in land water storage: 3%
The study resolves a significant discrepancy between observed sea level rise and contributions from ocean warming and ice melt, largely due to advancements in measurement techniques. Improved satellite observations and more accurate assessments of land movement have helped close this gap.
Researchers caution that these trends will persist for decades, and even if greenhouse gas emissions stabilize, sea levels will likely continue to rise for centuries due to the slow response of oceans and ice sheets to warming.
Overall, the findings underscore the enduring impact of climate change on sea levels and bolster confidence in climate models regarding future projections.
