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Wintertime Ice Growth in Arctic Sea Slows Long-Term Decline: NASA

The switch will happen once the sea ice is less than 1.6 feet thick at the beginning of winter, or its concentration

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While sea ice in the Arctic continues to be on the decline, a new research from the US Space agency NASA suggests that it is regrowing at faster rates during the winter than it was a few decades ago.

The findings showed that since 1958, the Arctic sea ice cover has lost on average around two-thirds of its thickness and now 70 per cent of the sea ice cap is made of seasonal ice, or ice that forms and melts within a single year.

But at the same time, that sea ice is vanishing quicker than it has ever been observed in the satellite record, it is also thickening at a faster rate during winter.

This increase in growth rate might last for decades, explained the researchers, in the paper to be published in the journal Geophysical Research Letters.

However, this does not mean that the ice cover is recovering, though. Just delaying its demise.

“This increase in the amount of sea ice growing in winter doesn’t overcome the large increase in melting we’ve observed in recent decades,” said lead author Alek Petty, a sea ice scientist at NASA’s Goddard Space Flight Center in Maryland.

NASA, Hubble, Keplar, asteroids
However, this does not mean that the ice cover is recovering, though. Just delaying its demise. Flickr

“Overall, thickness is decreasing. Arctic sea ice is still very much in decline across all seasons and is projected to continue its decline over the coming decades,” she added.

To explore sea ice growth variability across the Arctic, the team used climate models and observations of sea ice thickness from the European Space Agency’s CryoSat-2 satellite.

They found that in the 1980s, when Arctic sea ice was on average 6.6 feet thick in October, about 3.3 extra feet of ice would form over the winter.

This rate of growth may continue to increase, and in the coming decades, we could also have an ice pack that would on average be only around 3.3 feet thick in October, but could experience up to five feet of ice growth over the winter.

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However, by the middle of the century, the strong increases in atmospheric and oceanic temperatures will outweigh the mechanism that allows ice to regrow faster, and the Arctic sea ice cover will decline further, Petty said.

The switch will happen once the sea ice is less than 1.6 feet thick at the beginning of winter, or its concentration — the percentage of an area that is covered in sea ice — is less than 50 per cent, she noted. (IANS)

Next Story

NASA Names Mars Rock after The Band, The Rolling Stones

Slightly larger than a golf ball, the “Rolling Stones Rock” is said to have rolled about 3 feet (1 meter), spurred by the InSight spacecraft’s thrusters

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The "Rolling Stones Rock," slightly larger than a golf ball and named after the rock band, is seen on the surface of Mars after it rolled about 3 feet, spurred by the thrusters on NASA's InSight spacecraft, Nov. 26, 2018. VOA

The Rolling Stones have rocked stages around the world in their more than 50-year career. But now their influence has gone into space after NASA’s Mars InSight Mission named a rock on the planet after the band.

Slightly larger than a golf ball, the “Rolling Stones Rock” is said to have rolled about 3 feet (1 meter), spurred by the InSight spacecraft’s thrusters during touchdown on Mars in November, NASA said.

“In images taken by InSight the next day, several divots in the orange-red soil can be seen trailing Rolling Stones Rock,” it said. “It’s the farthest NASA has seen a rock roll while landing a spacecraft on another planet.”

Hollywood actor Robert Downey Jr. announced the name as Mick Jagger, Keith Richards, Ronnie Wood and Charlie Watts were about to perform Thursday night at Pasadena’s Rose Bowl Stadium, close to NASA’s Jet Propulsion Laboratory.

NASA, Mars, Rock
The Rolling Stones have rocked stages around the world in their more than 50-year career. Pixabay

The Rolling Stones, known for hits such as “Sympathy For The Devil” and “Brown Sugar,” called the honor “a milestone in our long and eventful history.”

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While the “Rolling Stones Rock” name is informal, it will feature on working maps of Mars, NASA said, but only the International Astronomical Union can give official scientific names for locations, asteroids and other objects in the solar system. (VOA)