Greenland Ice Loss is Weakening its Gravity 

Feature image: Greenland, Rodebay, Credit: Thomas Ritter from Pixabay. 

Greenland’s ice sheet is melting at a pace that is not only accelerating sea level rise but also altering Earth’s physical systems. A new Nature study led by Dr. Chad Greene of NASA’s Jet Propulsion Laboratory shows Greenland is losing around 30 million tonnes of ice every hour, so much mass that its gravitational pull is weakening, allowing ocean water it once held close to drift toward other parts of the world. Recent satellite-based analyses reveal that the true scale of this ice loss has been significantly underestimated. 

Key Developments 

• Greenland is losing 9,000–10,000 tonnes of ice per second, equivalent to 40% more than Canada’s annual water use each year. 

• The study found ice loss since 1985 has been underestimated by ~20%, or 1 trillion tonnes, due to overlooked glacier retreat in narrow fjords below sea level. 

• Nearly every glacier in Greenland has retreated over the past four decades. 

• Ice loss is now large enough to weaken Greenland’s gravity, redistributing ocean water globally. 

How This Links to Climate Change 

Rising global temperatures have lengthened Greenland’s melt season and accelerated glacier calving. The growing influx of freshwater into the North Atlantic is disrupting ocean salinity and density, key drivers of circulation systems that regulate climate far beyond the Arctic. 

Global Implications 

• Further weakening of the Atlantic Meridional Overturning Circulation (AMOC), already reduced by ~15% in the past five decades. 

• Increased risk of abrupt climate shifts, including severe cooling across Europe. 

• Potential contribution of 1–2 meters of global sea level rise with continued ice sheet loss. 

• Uneven sea level rise: As Greenland loses ice, its weakened gravity releases nearby ocean water, which shifts toward lower latitudes, causing greater sea level rise in the Southern Hemisphere while regions closer to Greenland see less rise. 

Urgent Response Needed 

• Immediate global emissions reductions to slow ice sheet destabilization. 

• Improved monitoring of glacier retreat in fjords and sub-sea regions. 

• Climate adaptation planning for coastal and climate-vulnerable communities. 

• Stronger international cooperation to address Polar-driven global risks. 

Read more: Extreme weather events | Health risks | Climate Risks Daily 

Original source: https://www.cbc.ca/radio/thecurrent/greenland-melting-ice-1.7089298