Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Sea levels could rise by 13 feet if West Antarctica’s ice sheet collapses

Sea levels could rise by 13 feet if West Antarctica’s ice sheet collapses



Global sea levels could rise to 13 feet if the ice sheet of West Antarctica collapses, a “significantly” worse result than scientists predict, the study warns.

Researchers at Harvard University are working on another project when they realize that the ice sheet of West Antarctica produces more water than usual.

Rising global temperatures mean that the 750,000-cubic-mile West Antarctic ice sheet is likely to collapse over the next 1,000 years.

The study’s authors say current models suggest that melting ice would raise sea levels by 10 feet from current levels, putting many coastal areas under water.

However, due to a process called water discharge as the ice melts, the base under the cover will “bounce”

;, forcing the surrounding water to enter the ocean, resulting in an additional 3 feet of global sea level on top of that generated by melting ice.

The study's authors say current models suggest that melting ice would raise sea levels by 10 feet from current levels, putting many coastal areas under water.

The study’s authors say current models suggest that melting ice would raise sea levels by 10 feet from current levels, putting many coastal areas under water.

Global sea levels could rise by up to 13 feet if the Western Antarctic ice sheet collapses, a

Global sea levels could rise by up to 13 feet if the Western Antarctic ice sheet collapses, a “significantly” worse result than scientists predict, the study warns.

EXPLANATED: WATER EXPLOITATION MECHANISM

The water discharge mechanism is a geological process that could lead to much higher average global sea level rise over the next 1000 years.

This occurs when the solid base of the Western Antarctic ice sheet sits upward as the ice melts.

The total weight of the ice sheet decreases as the melting continues.

The base is located below sea level, so when it rises, it pushes water from the surrounding area into the ocean.

This additional water is added to water from melting ice, increasing the total amount of global sea level rise.

The team predicts that the increase in this process will be about 3 feet, bringing the total sea level to 13 feet over the next 1,000 years.

The new prediction looks at the impact of this geological process on the wider impact of melting ice.

The process involves solid bases under the sea moving upward as the ice sheet melts, pushing the surrounding water into the ocean.

This process increases the overall level of sea level rise by about three feet, more than melting ice would take place in the next 1,000 years alone, the authors explained.

Co-author Linda Pan, a doctoral student at Harvard University in the United States, said the magnitude of the effect “shocked” us.

“Previous studies that have looked at the mechanism dismiss it as insignificant,” the authors explain.

Researchers are working on another project when they realize that the ice sheet of West Antarctica produces more water than usual.

To investigate how the water displacement mechanism affects sea levels around the world, they looked at what is happening under West Antarctica.

They studied how fast rock-like material flows through the Earth’s mantle, finding that water discharge occurs faster than expected.

Pan said, “No matter what scenario we used to collapse the Western Antarctic ice sheet, we always found that this extra meter of global sea level rise had happened.”

The complete collapse of the ice sheet will add 3.3 feet to current estimates over the next 1,000 years – leading to 13.3 feet, the team explained.

Postgraduate co-author Evelyn Powell said that if the leaf collapsed, it would lead to a 10.5-foot rise in sea level.

“What we’ve shown is that the water disposal mechanism will add an extra meter, or 30 percent, to the total.”

Even in the next century, global sea level rise would increase by 20% due to the mechanism for discharging water under West Antarctica, researchers say.

Due to a process called water discharge, as the ice melts, the base under the roof will

Due to a process called water discharge, as the ice melts, the base under the roof will “bounce”, forcing the surrounding water into the ocean, causing an additional 3 feet of global sea level rise on top of that generated by the melting ice.

The complete collapse of the ice sheet will add 3.3 feet to current estimates over the next 1,000 years - increasing it to 13.3 feet, the team explained.

The complete collapse of the ice sheet will add 3.3 feet to current estimates over the next 1,000 years – increasing it to 13.3 feet, the team explained.

Co-author Professor Jerry Mitrovica said that any published forecast of sea level rise due to melting ice in West Antarctica was based on climate modeling.

He said that whether the forecast extends to the end of this century or longer into the future, the modeling “will have to be revised upwards because of their work”.

The effect of water displacement and the low viscosity of the mantle must be taken into account in order to accurately predict future sea level rise, the researchers said.

Ms. Pan said: “Sea level rise does not stop when the ice stops melting. The damage we are doing to our shores will continue for centuries. ‘

The findings are published in the journal Science Advances.

GLAKERS AND ICE MELTING SHELTS WILL HAVE A “DRAMATIC IMPACT” ON GLOBAL SEA LEVELS

Global sea levels could rise to 10 feet (3 meters) if the Twates Glacier in West Antarctica collapses.

Rising sea levels threaten cities from Shanghai to London, to low-lying parts of Florida or Bangladesh, and to entire countries like the Maldives.

In the UK, for example, climbing 6 meters (2 meters) or more can lead to areas such as Hull, Peterborough, Portsmouth and parts of East London and the mouth of the Thames at risk of being submerged.

The collapse of the glacier, which could begin in decades, could also submerge major cities such as New York and Sydney.

Parts of New Orleans, Houston and Miami in the southern United States would also be particularly affected.

A 2014 study by a group of interested scientists looked at 52 indicators of sea level in communities in the United States.

Tidal floods have been found to increase dramatically in many parts of the East and the Gulf Coast, based on a conservative estimate of the projected sea level rise based on current data.

The results showed that most of these communities will experience a sharp increase in the number and severity of tidal floods in the coming decades.

By 2030, more than half of the 52 communities surveyed are expected to experience an average of at least 24 tidal floods a year in open areas, assuming moderate forecasts for sea level rise. Twenty of these communities could see tripling or more in tidal floods.

The Mid-Atlantic coast is expected to see some of the largest increases in flood frequency. Places such as Annapolis, Maryland and Washington, D.C., can expect more than 150 tidal floods a year, and 80 tidal floods can be observed in several places in New Jersey.

In the United Kingdom, with a two-meter (20-foot) rise by 2040, large parts of Kent will be almost completely submerged, according to a report published in the Proceedings of the National Academy of Sciences in November 2016.

Southern coast areas such as Portsmouth, as well as Cambridge and Peterborough, will also be severely affected.

Cities and towns around the mouth of the Humber, such as Hull, Scunthorpe and Grimsby, would also experience intense flooding.


Source link