Researchers at the Hong Kong Polytechnic University implemented innovative forward modeling techniques combined with satellite laser ranging to monitor global ocean mass changes over 30 years (1993-2022). This study provides the first accurate record of world ocean mass changes, revealing that global mean sea level (GMSL) is rising at an average rate of 3.3 mm per year, primarily due to two processes: the thermal expansion of seawater and the addition of freshwater from melting land ice.
The study noted that approximately 60% of the observed sea level rise—around 90 mm—was linked to increased ocean mass, predominantly from land ice melting, especially in Greenland. This research marks a significant advancement in understanding sea level trends and the impact of climate change, as it directly correlates satellite laser range data with ocean mass changes.
Professor Jianli Chen pointed out the accelerating effects of climate warming on ice loss and sea level rise. The findings are documented in the Proceedings of the National Academy of Sciences, supported by multiple research grants.
