The loss of Antarctic ice has increased sixfold since 1979: Study
TAMPA, USA – Global warming is melting ice in the Antarctic faster than ever – about six times more per year than it did 40 years ago – which has always been higher lake leads scientists warned worldwide.
The melting of the Antarctic has already increased global sea levels by more than a half inch (1.4 cm) between 1979 and 2017, the report said in the Proceedings of the National Academy of Sciences (PNAS) -revised US Journal.
And the rate of meltdown is expected to lead to catastrophic sea-level rise in the coming years, according to Eric Rignot, chair of Earth System Research at the University of California, Irvine. [1
An increase of 1.8 meters to 2100, as some scientists predict in the worst case would flood many coastal cities where millions of people around the world live, as previous research has shown.
For the present study, researchers have made the longest assessment of ice mass in the Antarctic in 18 geographic regions.
The data are from high-resolution aerial photographs taken by NASA aircraft and satellite radars from several space agencies.
The researchers found that Antarctica from 1979 to 1990 lost an average of 40 billion tons of ice mass annually.
In the years 2009 to 2017, ice loss had increased more than sixfold, to 252 billion tons per year.
More worryingly, the researchers found that areas that were once considered "stable and immune" to "change in the eastern Antarctic," says the study, scattered quite a bit of ice.
"The Wilkes Land sector in the eastern Antarctic has always been an important participant in mass loss, even up to this point in time, like the 1980s, as our research has shown," Rignot said.
"This region is probably more susceptible to climate change than traditionally believed, and that's important to know because it contains more ice than the West Antarctic and the Antarctic Peninsula combined."
The Total Amount of ice in the Antarctic would be enough, if everything had melted, to raise the sea level to 577 feet (187 feet).
By far most of the ice in Antarctica is concentrated in the east, where there is enough sea ice. Sea level rose 170 feet, compared to about 17 feet in the entire West Antarctic ice sheet.
The East Antarctic ice sheet is the largest in the world and contains about half of the earth's fresh water.
So far, research has shown the most successes showing that most of the melting takes place in the west.
A study published in Nature in June last year showed that Antarctic melted ice had tripled since 1992, but did not show significant melting in the East.
published a follow-up study i In Nature, seabed sediment layers were analyzed in September 2018 when the Wilkes Subglacial Basin, part of the eastern Antarctic south of Australia, melted some 125,000 years ago.
In this study, the massive basin began to melt With a steady rise in temperature of just two degrees Celsius (3.6 Fahrenheit), the ceiling required by the Paris Paris Agreement on Climate Change called for averting global warming.
Recent research shows that the melting of the eastern Antarctic deserves more attention. According to the PNAS report.
The warming of seawater will only accelerate ice loss in the future, and experts say sea levels will continue to rise for centuries, no matter what humans are doing now to stem climate change.
Recent research has shown that the oceans are warming faster than previously thought, which has led to new records in recent years.