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A huge piece of ice will change the coasts of the world sooner than we thought




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Global mean sea level has risen by about 20 cm since 1900, with three of these inches recorded in the last quarter century and more frequent coastal flooding.

Florida-sized ice becomes unstable and could flow into the ocean sooner than expected, raising sea levels by a further one-and-a-half feet ̵

1; assuming that global temperatures remain unchanged and do not continue to rise.

Spoiler alert: No one anticipates this Temperatures will soon cease.

A new study this week examined the potential instability within the vast Thwaites Glacier in the Antarctic is that could accelerate the unavoidable flow velocity into the ocean.

"When you trigger Because of this instability, you do not need to push the ice sheet by raising the temperature. It will go on by itself, and that's the concern, "said Georgia Tech professor Alex Robel, who led the NASA-funded study published in Proceedings of the National Academy of Sciences .

The instability has to do with the amount of ice that rests on the seabed above the water and contributes to sea level rise.

"As soon as the ice passes the baseline and only over water, it contributes to the sea. That's because the lift stops it more than before," Robel said. "Ice flows into the floating ice shelf and melts or breaks off as icebergs."

Once the ice is above water, it also speeds up the process of allowing more ice to flow over it to the sea.

"The process is self-sustaining," said Helene Seroussi, NASA's JPL scientist, who helped with the study. "After reaching the turning point, the Thwaites glacier could lose all of its ice in 150 years, which would lead to an increase

Perhaps the most devastating problem is that the instability of the ice sheet can make forecasting future flood risks particularly difficult.

"They want to develop a critical infrastructure that will be resistant to one hundred years from now The potential limit of potential sea-level scenarios is, "said Robel." It may mean that you build your water treatment plants and nuclear reactors in the worst possible scenario, which can be a two- to three-foot rise in sea level from the Thwaites Glacier. "] Thwaites Glacier" data-height = "1684" data-width = "3000" />

The outer e edge of the Thwaites Glacier. When the glacier flows into the ocean, it turns into sea ice and raises the sea level.

NASA / James Yungel

The global mean sea level has risen by about 20 cm. 20 cm) since 1900, with three of these inches coming in the last quarter of a century and flooding on the coast becoming more frequent.

But a huge ice surface the size of Florida becomes unstable and could flow into the ocean sooner All this assumes that global temperatures remain unchanged and do not increase further.

Spoiler alert: No one expects these temperatures to rise any time soon.

A new s This week, we looked at the possible instability of the vast Thwaites glacier in the Antarctic, which could accelerate its inevitable flow velocity into the ocean.

"If you trigger this instability, you do not need to push the ice shield any further to boost temperatures. It will go on by itself, and that's the concern, "said Georgia Tech professor Alex Robel, who led the NASA-funded study published in Proceedings of the National Academy of Sciences .

The instability has to do with the amount of ice that rests on the seabed above the water and contributes to sea level rise.

"As soon as the ice passes the baseline and only over water, it contributes to the sea. That's because the lift stops it more than before," Robel said. "Ice flows into the floating ice shelf and melts or breaks off as icebergs."

Once the ice is above water, it also speeds up the process of allowing more ice to flow over it to the sea.

"The process is self-sustaining," said Helene Seroussi, NASA's JPL scientist, who helped with the study. "After reaching the turning point, the Thwaites glacier could lose all of its ice in 150 years, which would lead to an increase

Perhaps the most devastating problem is that the instability of the ice sheet can make forecasting future flood risks particularly difficult.

"They want to develop a critical infrastructure that will be resistant to one hundred years from now The potential limit of potential sea-level scenarios is, "said Robel." It may mean that you build your water treatment plants and nuclear reactors in the worst possible scenario, which can be a two- to three-foot rise in sea level from the Thwaites Glacier. That's a big difference. "


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