The melting of part of an ice sheet in Greenland is nearing tipping point and further environmental damage could follow, researchers said.
Analysis of the Jakobshavn drainage basin revealed that the central-western Greenland ice sheet is reaching a stage from which it cannot recover.
Data indicated that a critical threshold has been reached after a century of accelerated melting.
"We might be seeing the beginning of a large-scale destabilisation, but at the moment we cannot tell, unfortunately," said Dr Niklas Boers from the Potsdam Institute for Climate Impact Research, one of the two authors of the research.
"So far, the signals we see are only regional, but that might simply be due to the scarcity of accurate and long-term data for other parts of the ice sheet."
Dr Boers and Martin Rypdal from the Arctic University of Norway concluded that this part of the Greenland ice sheet is losing stability, and is very close to tipping into a state of accelerated melting, PNAS said on Monday.
Should that scenario play out, it will not be possible to save the sheet even if the Arctic warming trend was halted in the coming decades.
An ice sheet can only maintain its size if the loss of mass from melting is replaced by snow falling on to its surface. The warming of the Arctic disrupts that cycle.
As the surface of the ice is exposed to higher temperatures, it leads to more melting, height reductions and accelerated loss of mass.
After a point, this process cannot be reversed because a much colder climate would be needed for the ice sheet to regain its original size.
"We need to monitor the other parts of the Greenland ice sheet more closely, and we urgently need to better understand how different positive and negative feedback might balance each other, to get a better idea of the future evolution of the ice sheet," Dr Boers said.
The work is part of the Tipes project, co-ordinated and led by the University of Copenhagen in Denmark and the Potsdam institute in Germany.
COMPANY PROFILE
Founders: Alhaan Ahmed, Alyina Ahmed and Maximo Tettamanzi
Total funding: Self funded
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Killing of Qassem Suleimani
Company%20Profile
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The Sand Castle
Director: Matty Brown
Stars: Nadine Labaki, Ziad Bakri, Zain Al Rafeea, Riman Al Rafeea
Rating: 2.5/5
What is double taxation?
- Americans living abroad file taxes with the Internal Revenue Service, which can cost hundreds of dollars to complete even though about 60 per cent do not owe taxes, according to the Taxpayer Advocate Service
- Those obligations apply to millions of Americans residing overseas – estimates range from 3.9 million to 5.5 million – including so-called "accidental Americans" who are unaware they hold dual citizenship
- The double taxation policy has been a contentious issue for decades, with many overseas Americans feeling that it punishes them for pursuing opportunities abroad
- Unlike most countries, the US follows a citizenship-based taxation system, meaning that Americans must file taxes annually, even if they do not earn any income in the US.
The specs
Engine: Long-range single or dual motor with 200kW or 400kW battery
Transmission: Single-speed automatic
Max touring range: 620km / 590km
Price: From Dh250,000 (estimated)
How to protect yourself when air quality drops
Install an air filter in your home.
Close your windows and turn on the AC.
Shower or bath after being outside.
Wear a face mask.
Stay indoors when conditions are particularly poor.
If driving, turn your engine off when stationary.
SPECS
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Cry Macho
Director: Clint Eastwood
Stars: Clint Eastwood, Dwight Yoakam
Rating:**
UAE currency: the story behind the money in your pockets
Ticket prices
- Golden circle - Dh995
- Floor Standing - Dh495
- Lower Bowl Platinum - Dh95
- Lower Bowl premium - Dh795
- Lower Bowl Plus - Dh695
- Lower Bowl Standard- Dh595
- Upper Bowl Premium - Dh395
- Upper Bowl standard - Dh295
WHAT%20START-UPS%20IS%20VISA%20SEEKING%3F
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The specs
Engine: 3.8-litre, twin-turbo V8
Transmission: eight-speed automatic
Power: 582bhp
Torque: 730Nm
Price: Dh649,000
On sale: now
Farasan Boat: 128km Away from Anchorage
Director: Mowaffaq Alobaid
Stars: Abdulaziz Almadhi, Mohammed Al Akkasi, Ali Al Suhaibani
Rating: 4/5
Company%20Profile
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'Nope'
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Jordan%20Peele%0D%3Cbr%3E%3Cstrong%3EStars%3A%3C%2Fstrong%3E%20Daniel%20Kaluuya%2C%20Keke%20Palmer%2C%20Brandon%20Perea%2C%20Steven%20Yeun%0D%3Cbr%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%203.5%2F5%3C%2Fp%3E%0A
UAE currency: the story behind the money in your pockets
Killing of Qassem Suleimani
Wicked
Director: Jon M Chu
Stars: Cynthia Erivo, Ariana Grande, Jonathan Bailey
FROM%20THE%20ASHES
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TO A LAND UNKNOWN
Director: Mahdi Fleifel
Starring: Mahmoud Bakri, Aram Sabbah, Mohammad Alsurafa
Rating: 4.5/5
ILT20%20UAE%20stars
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Army of the Dead
Director: Zack Snyder
Stars: Dave Bautista, Ella Purnell, Omari Hardwick, Ana de la Reguera
Three stars
match info
Athletic Bilbao 1 (Muniain 37')
Atletico Madrid 1 (Costa 39')
Man of the match Iker Muniain (Athletic Bilbao)
CRICKET%20WORLD%20CUP%20LEAGUE%202
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