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SUNDAY, JULY 13, 2025
As climate changes, study finds world's glaciers melting faster

Climate Change

Reuters
28 April, 2021, 10:00 pm
Last modified: 28 April, 2021, 10:03 pm

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As climate changes, study finds world's glaciers melting faster

The melt was significantly impacting sea levels by about 0.74 millimetres a year, or 21% of overall sea level rise observed during the period

Reuters
28 April, 2021, 10:00 pm
Last modified: 28 April, 2021, 10:03 pm
Meltwater flows over the Laohugou No. 12 glacier in the Qilian mountains, Subei Mongol Autonomous County in Gansu province, China, September 27, 2020. REUTERS/Carlos Garcia Rawlins
Meltwater flows over the Laohugou No. 12 glacier in the Qilian mountains, Subei Mongol Autonomous County in Gansu province, China, September 27, 2020. REUTERS/Carlos Garcia Rawlins

Nearly all of the world's glaciers are losing mass - and at an accelerated pace, according to a new study published Wednesday that could impact future projections for ice loss.

The study https://go.nature.com/2QBPCTm in the science journal Nature provides one of the most wide-ranging overviews yet of ice mass loss from about 220,000 glaciers around the world, a major source of sea level rise.

Using high-resolution imagery from NASA's Terra satellite from between 2000 and 2019, a group of international scientists found that glaciers, with the exception of the Greenland and Antarctic ice sheets which were excluded from the study, lost an average of 267 gigatonnes of ice per year.

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A gigatonne of ice would fill New York City's Central Park and stand 341 meters (1,119 feet) high.

The researchers also found that glacier mass loss accelerated. Glaciers lost 227 gigatonnes of ice annually from 2000 to 2004, but that increased to an average of 298 gigatonnes each year after 2015.

The melt was significantly impacting sea levels by about 0.74 millimetres a year, or 21% of overall sea level rise observed during the period.

Glaciers tend to have a faster response to climate change compared with ice sheets in Greenland and Antarctica, and are currently contributing more to sea level rise that either individual ice sheet, scientists said.

The study could fill important gaps in understanding about ice mass loss, leading to more accurate predictions, said co-author of the study Robert McNabb, a remote sensing scientist at Ulster University in the United Kingdom. Previous studies looking at individual glaciers only account for about 10% of the planet, he said.

Scientists have long warned that warming temperatures driven by climate change are eating into glaciers and ice sheets around the world, contributing to higher sea levels that threaten the world's populous coastal cities. The latest reports https://reut.rs/3xuIn0b by the Intergovernmental Panel on Climate Change project that future sea levels will rise by more than a meter by 2100.

Some glaciers in Alaska, Iceland, the Alps, the Pamir mountains and the Himalayas were among the most impacted by melting, researchers found. Glaciers with surrounding communities provide an important water source and their decline could lead to serious food and water shortages.

"Those areas are seeing a rapid pace of glacier melt that could be fairly worrying," McNabb said.

"We get this increase in melt and that actually increases the availability of water that comes in these rivers... but the problem is, after a period of time, that stops increasing and then decreases fairly rapidly," he added.

While the study did not delve into the cause of the glacial retreat, rising temperatures widely believed by scientists to be the result of human emissions were inevitably leading to more ice loss, McNabb said.

"It's hard to separate the fact that the temperature is what is causing the melt with the fact that humans are, by and large, causing the increase in temperature," he said.

Once glacial ice melts, it could take decades or centuries to regrow because it must pile up year after year, scientists said. The study reiterates that the world must bring down global temperatures to slow ice loss, said Twila Moon, a glaciologist at the National Snow and Ice Data Center who was not involved in the study.

"I have no expectation, in all honesty, that even substantial action to reduce our emissions and control the Earth's temperature rise is going to grow our glaciers," Moon said. "We're at a point where we're trying to keep as much ice as possible and slow that rate of loss," she added.

While researchers identified instances where melt rates actually slowed between 2000 and 2019, like Greenland's east coast, they attributed that to a weather anomaly that led to higher precipitation and lower temperatures.

McNabb said the study's overall picture was one of "fairly rapid" ice mass loss, with no indication it would change soon, but there is still time to put the brakes on melt by reducing emissions.

"When you see something like this where glaciers are losing mass, it's getting faster, that sounds really bad," he said. "But there's something that we can do here, we need to act."

Environment / Top News

Glaciers / Global warming

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