Friday , September 17 2021

Since 1979, ice loss in Antarctica has been rising sixfold, with new research being carried out.



Global warming melt ice in Antarctica faster than ever before – about six times more than a year now than 40 years ago – which leads to increasingly high sea levels worldwide, scientists warn.

Antarctic melting has already raised the global sea level by 1.4 cm between 1979 and 2017, according to a report by the National Academy of Sciences (PNAS), a peer-reviewed journal of the United States.

The 2016 photo by NASA shows the Getz ice shelf.

The 2016 photo by NASA shows the Getz ice shelf.

AP

It is expected that the pace of melting will lead to catastrophic sea-level rise in the coming years, says lead author Eric Rignot, head of the Department of Earth Systems Science at the University of California Irvine.

"As the Antarctic ice sheet continues to melt, we expect the multi-meter sea level to rise from Antarctica in the next centuries," said Rinoth.

A rise of 1.8 meters (six feet) by 2100, as predicted by some scientists in the worst scenarios, will flood many coastal cities where millions of people around the world live, according to preliminary studies.

For current research, researchers have begun the most ancient estimates of icemass in Antarctica, in 18 geographic regions.

The data came from high-resolution aerial photographs taken by NASA aircraft, along with a satellite radar from several space agencies.

The researchers found that from 1979 to 1990, Antarctica dropped annually an average of 40 billion tons of ice mass.

From 2009 to 2017, ice loss has increased by more than 6 times, to 252 billion tons per year.

Even more disturbingly, the researchers found that the areas that were once considered "stable and immune to change" in East Antarctica also dump a lot of ice, the study said.

Global warming melt ice in Antarctica faster than ever before.

Global warming melt ice in Antarctica faster than ever before.

AP

"The Wilkes Land farming in East Antarctica has always been an important player in mass loss, even in the 1980s, as our studies have shown," said Rynot.

"This region is likely to be more sensitive to climate than is traditionally foreseen, and it is important to know, because it contains more ice than Western Antarctica and the Antarctic Peninsula."

Loss of ice

The total amount of ice in Antarctica, if all melt, will be enough to raise the sea level by 187 feet (57 meters).

Today, the largest amount of ice in Antarctica is concentrated in the east, where there is enough sea ice to pass 170 feet of sea level, compared with approximately 17 feet in the entire western Antarctic ice sheet.

The East Antarctic ice sheet is the largest in the world, containing about half the fresh water of the Earth.

So far, most studies have shown that most melting occurs in the West.

Huge split Antarctic glaciers disturb scientists.

A landmark study published in Nature in June last year found that since the year 1992 Antarctic ice melt has tripled, but in the east did not show significant melting.

However, in a subsequent study published in Nature in September 2018, layers of sediments from the ocean floor were analyzed, where in recent times submerged basins in the Eastern Antarctic to the south of Australia melted about 125,000 years ago.

This study showed that the mass pool will melt again, with a steady rise in temperature of just two degrees Celsius, which is required in the landmark in the climate agreement in Paris, in order to avoid the fall of global warming.

Recent studies show that eastern Antarctic melting deserves "more attention," according to PNAS.

The heating of the water in the ocean will only accelerate the loss of ice in the future, and experts say the sea level will continue to grow for centuries, regardless of what the person is doing now to curb climate change.

Recent studies have shown that the oceans are warming faster than previously thought by setting new heat records over the past few years.


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