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MoneyGreenland ice sheet melting faster than thought: study

05:50  20 june  2019
05:50  20 june  2019 Source:   msn.com

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A study published Friday in Science magazine finds that the Greenland ice sheet is shrinking faster than researchers had previously thought . Konrad Steffan at the University of Colorado in Boulder has been measuring actual conditions on the Greenland ice sheet on a daily basis since 1979.

The pace of ice loss has increased four-fold since 2003 as enormous glaciers are depositing ever larger chunks of ice into the Atlantic ocean, where it melts , causing sea levels to rise.

Greenland ice sheet melting faster than thought: study © John SONNTAG This image obtained November 14, 2018 courtesy of NASA shows the Hiawatha impact crater covered by the Greenland Ice Sheet and a tongue of ice that breaches the crater’s rim

Greenland's ice sheet may have completely melted within the next millennium if greenhouse gas emissions continue at their current rate, according to a new study with implications for sea-level rise around the world.

The Greenland ice sheet holds the equivalent of seven meters (yards) of sea level.

"If we continue as usual, Greenland will melt," said lead author Andy Aschwanden, a research associate professor at the University of Alaska Fairbanks' Geophysical Institute.

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A new study warns that Greenland ’s ice is melting faster than scientists previously thought . But perhaps the biggest surprise is that most of this ice loss The new study , published January 21 in the Proceedings of the National Academy of Sciences, found that the largest sustained ice loss from early

Greenland 's ice sheet is melting faster than previously thought , researchers say. Since the 1980s, the rate of ice loss from Greenland has increased six-fold, according to the study published Monday in the Proceedings of the National Academy of Sciences.

It is the most recent warning about warming in the world's coldest regions.

"What we are doing right now in terms of emissions, in the very near future, will have a big long-term impact on the Greenland ice sheet, and by extension, if it melts, to sea level and human society," Aschwanden said.

The study, which used data from NASA's Operation IceBridge airborne campaign and was published in Science Advances, is the latest to suggest a much greater rate of melt than was estimated by older models.

The model relies on more accurate representations of the flow of "outlet glaciers," river-like bodies of ice that connect to the ocean.

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Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study
Greenland ice sheet melting faster than thought: study

"Outlet glaciers play a key role in how ice sheets melt, but previous models lacked the data to adequately represent their complex flow patterns," NASA said in a statement about the study.

"The study found that melting outlet glaciers could account for up to 40 percent of the ice mass lost from Greenland in the next 200 years."

As ocean waters have warmed over the past two decades, they have melted the floating ice that once shielded the outlet glaciers.

As a result, "the outlet glaciers flow faster, melt and get thinner, with the lowering surface of the ice sheet exposing new ice to warm air and melting as well."

In the next 200 years, the ice sheet model shows that melting at the present rate could contribute 48 to 160 centimeters (19 to 63 inches) to global sea level rise, 80 percent higher than previous estimates.

In October, the UN's Intergovernmental Panel for Climate Change (IPCC) reported that avoiding global climate chaos will require a major transformation of society and the world economy that is "unprecedented in scale," and warned time is running out to avert disaster.

Scientists Find Dozens of Lakes Buried Far Below Greenland's Ice.
For decades, scientists working in Antarctica have been documenting subglacial lakes, bodies of water buried miles beneath the ice. 

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