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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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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.

A new study warns that Greenland ’s ice is melting faster than scientists previously thought . The new study , published January 21 in the Proceedings of the National Academy of Sciences, found that the largest sustained ice loss from early 2003 to mid-2013 came from Greenland 's southwest region

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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WASHINGTON: Greenland 's ice sheet may have completely melted within the next millennium if greenhouse gas emissions continue at their current rate "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."

Miami (AFP) - Greenland 's highly unstable ice sheet is melting more than seven percent faster than previously thought , scientists said this week after discovering a hotspot beneath the Earth's crust that was distorting their calculations. The study in the journal Science Advances raises concern about the

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.

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