Antarctica lost 3 trillion ice in 25 years, sea level rises

An accelerated Antarctic merger has increased sea levels in the world by almost one centimeter since the early 1990s, a risk to the coasts from the Pacific Islands to Florida, an international team of scientists said on Thursday.

Antarctica has enough ice to raise sea level by 58 meters if everything melts, disappearing landscapes from Greenland to the Himalayas and making the future uncertain.

The frozen continent has lost nearly three trillions of ice from 1992 and 2017, said 84 scientists in what they called the most comprehensive view of the Antarctic Ice to date.

Meltdown, followed by satellite data and other measurements, contributes 0.76 cm to sea level rise since 1992, writes them in the journal Nature.

And ice losses rose to 219 billion tons a year since 2012, from the previous 76 billion. "Sharp growth ... is a big surprise," Reuters told Reuters, Andrew Shepherd of the University of Leeds and the head of the report.

Most of the ice was losing from the West of Antarctica and the Antarctic Peninsula, where the warm water of the ocean is melting the ice shelves at the bottom of the glaciers, allowing the ice to fall to land slipping faster to the sea, the study said.

One millimeter of the world's only global sea level rise is equivalent to 360 billion tonnes of frozen ice, or an imaginary ice cream cube with about seven miles (4.35 miles).

In general, world sea levels have risen by about 20 cm in the last century, driven mainly by a natural extension of already existing oceans.

A major UN assessment in 2014 said seas could rise this century from about 30 cm to almost one meter.

Shepherd said that only Antarctica is now on track to raise sea levels in the world by about 15 cm to 2100, on the latest estimates.

Such an increase seems a little but would cause coastal flooding during storms in the highest deteriorating tides, he said. Sea level rise is a threat to the cities from New York to Shanghai as well as the lower nations from the Pacific Ocean to the Netherlands.

"We are looking at these reports closely," said Michiel van den Broeke, professor of polar meteorology at Utrecht University in Holland.

According to the 2015 climate agreement, almost 200 governments set a target for curbing fossil fuels this century to limit warming. US President Donald Trump plans to withdraw from the pact and focus on jobs and coal in the US.

Chris Rapley, a climatic professor at University College London, who was not involved in the study, wrote in a comment that suggested that in 2005 an "Antarctic giant in Antarctica would wake up from sleep".

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