Greenland's gravity is weakening and here is the 30 million tonnes reason

Greenland is losing an estimated 30 million tonnes of floating ice every hour, a pace significantly higher than previously estimated, according to a study published in the journal Nature. Scientists say the rapid ice loss is not only contributing to rising sea levels but is also weakening Greenland's gravitational pull as the island loses mass.

Researchers found that the hourly loss of floating ice is about 40% greater than Canada's total annual water consumption. The study attributes the accelerated melting to climate change, which has lengthened Greenland's summers and increased the rate at which glaciers and the ice sheet are shrinking.

Greenland's gravity is weakening

William Colgan, a senior researcher with the Geological Survey of Denmark and Greenland, told The Current that the enormous amount of ice disappearing from Greenland is altering the island's gravitational influence.


Greenland's massive ice sheet exerts a gravitational pull that keeps surrounding ocean water close to its coastline. As the ice sheet shrinks, that gravitational force weakens, allowing water to redistribute to other parts of the world where gravity remains stronger.

Ice loss far greater than floating ice alone

The study estimates that Greenland loses around 30 million tonnes of floating ice every hour along glacier fronts. However, when the entire ice sheet, including ice resting below sea level, is taken into account, the total ice loss reaches an estimated 9,000 to 10,000 tonnes every second, according to Colgan.

Scientists say this massive discharge of freshwater into the North Atlantic is changing the region's ocean system.

"The changes around Greenland are tremendous and they're happening everywhere. Almost every glacier has retreated over the past few decades," said Chad Greene, the study's lead author at NASA's Jet Propulsion Laboratory, told the Guardian.

Potential impact on ocean currents and sea levels

Researchers warn that the increasing flow of freshwater into the North Atlantic could weaken the Atlantic Meridional Overturning Circulation (AMOC), a major system of ocean currents that transports warm water northward and cold water southward. While scientists are still studying the extent of the impact, they say changes to this circulation could influence weather patterns and sea levels worldwide.

Colgan noted that Greenland's shrinking ice sheet has different effects across the globe. The largest sea-level impacts from Greenland's mass loss are expected in the Southern Hemisphere, while ice loss from Antarctica has a greater influence on sea levels in the Northern Hemisphere.

Scientists studying ecological consequences

Researchers say the long-term impact of Greenland's meltwater on marine ecosystems remains uncertain.

Some studies suggest that increased freshwater could bring more nutrients into fjords and enhance ocean productivity, potentially benefiting fisheries. Others warn that excessive freshwater could create surface layers that reduce the vertical mixing of ocean waters, affecting marine ecosystems.

Scientists also note that oceans are becoming increasingly acidic as they absorb more carbon dioxide, a process that can negatively affect fisheries and marine life.

Massive crevasses reveal accelerating change

Colgan plans to continue field research in Greenland later this year to monitor rapidly expanding crevasse fields in the central-western and northwestern parts of the ice sheet.

He said some of the newly formed crevasses are about 20 metres wide and stretch nearly five kilometres in length.

"They weren't there 20 years ago," Colgan said, adding that the growing crevasse fields suggest Greenland's ice sheet may be responding to climate change more rapidly than scientists had previously expected.