Monday January 21, 2019
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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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US shutdown delays space missions but NASA not grounded: Report,

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.

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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

Partial Shutdown of US Delays Space Missions, But NASA Not Grounded

Other active space missions includes NASA probes OSIRIS-REx and New Horizons spacecraft that continue to gather data in Earth orbit and the Moon, Mars, Jupiter and beyond, the report said

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People rally to call for an end to the partial government shutdown in Detroit, Thursday, Jan. 10, 2019. VOA

The partial shutdown of the US federal government has had a serious impact on the country’s space agency NASA and development work on most future space missions has been slowed or suspended.

However, NASA has not been totally grounded by the partial government shutdown that began on December 22, after last-minute negotiations in Congress failed to end a budget standoff.

Over 95 per cent of the space agency’s employees have been furloughed. As a result, various research projects, including the Hubble Space Telescope has been put on hold, the Space.com reported on Wednesday.

Hubble suffered a mechanical problem that only furloughed NASA employees could repair.

Many workers also gathered outside the Johnson Space Center in Houston to protest the shutdown and its deleterious effects on their lives and the nation’s space programmes.

The Telescope facilities that have so far remained open during the shutdown will soon run out of money and cease operations.

This includes the National Radio Astronomy Observatory (NRAO), a federally funded organization that operates the Atacama Large Millimeter Array (ALMA), the Green Bank Telescope and the Very Large Array (VLA), the report noted.

The partial shutdown become the longest on record after January 12, overtaking the previous record of the 21-day impasse in 1995-96 under then President Bill Clinton.

NASA, tissue
US shutdown delays space missions but NASA not grounded: Report,

President Donald Trump and the Congress have been at loggerheads over his demand to include in the budget $5.7 billion funding for building a border wall along the Mexico border. Democratic leaders have rejected his call.

NASA’s Stratospheric Observatory for Infrared Astronomy (SOFIA), also called the “flying telescope” has also ceased operations since the shutdown.

The telescope, which is mounted to the fuselage of a Boeing 747 aircraft, has not flown since the shutdown began, the report said.

However, despite the shutdown some “excepted” employees remained at work, assisting astronauts aboard the International Space Station (ISS) and other space missions, the report said.

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Last week, astronauts aboard the ISS conducted a range of scientific experiments and public-outreach work. They engaged in an orbital Q&A with school kids and answered a variety of questions, from the nature of the research performed aboard the ISS to the type of training astronauts receive to whether your ears pop in space.

On January 13, a SpaceX Dragon cargo capsule departed the orbiting lab for Earth, eventually splashing down in the Pacific Ocean. The robotic Dragon brought down important scientific research and hardware for examination here on terra firma.

Other active space missions includes NASA probes OSIRIS-REx and New Horizons spacecraft that continue to gather data in Earth orbit and the Moon, Mars, Jupiter and beyond, the report said.  (IANS)