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Evidence of Antarctic glacier’s tipping point confirmed — ScienceDaily

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Researchers have confirmed for the primary time that Pine Island Glacier in West Antarctica might cross tipping factors, resulting in a speedy and irreversible retreat which might have vital penalties for world sea degree.

Pine Island Glacier is a area of fast-flowing ice draining an space of West Antarctica roughly two thirds the scale of the UK. The glacier is a specific trigger for concern as it’s shedding extra ice than every other glacier in Antarctica.

Presently, Pine Island Glacier along with its neighbouring Thwaites glacier are liable for about 10% of the continued improve in world sea degree.

Scientists have argued for a while that this area of Antarctica might attain a tipping level and endure an irreversible retreat from which it couldn’t get well. Such a retreat, as soon as began, might result in the collapse of the whole West Antarctic Ice Sheet, which comprises sufficient ice to boost world sea degree by over three metres.

Whereas the final chance of such a tipping level inside ice sheets has been raised earlier than, displaying that Pine Island Glacier has the potential to enter unstable retreat is a really completely different query.

Now, researchers from Northumbria College have proven, for the primary time, that that is certainly the case.

Their findings are revealed in main journal, The Cryosphere.

Utilizing a state-of-the-art ice circulation mannequin developed by Northumbria’s glaciology analysis group, the group have developed strategies that enable tipping factors inside ice sheets to be recognized.

For Pine Island Glacier, their examine exhibits that the glacier has at the very least three distinct tipping factors. The third and ultimate occasion, triggered by ocean temperatures growing by 1.2C, results in an irreversible retreat of the whole glacier.

The researchers say that long-term warming and shoaling traits in Circumpolar Deep Water, together with altering wind patterns within the Amundsen Sea, might expose Pine Island Glacier’s ice shelf to hotter waters for longer durations of time, making temperature adjustments of this magnitude more and more possible.

The lead creator of the examine, Dr Sebastian Rosier, is a Vice-Chancellor’s Analysis Fellow in Northumbria’s Division of Geography and Environmental Sciences. He specialises within the modelling processes controlling ice circulation in Antarctica with the objective of understanding how the continent will contribute to future sea degree rise.

Dr Rosier is a member of the College’s glaciology analysis group, led by Professor Hilmar Gudmundsson, which is presently engaged on a serious £4million examine to analyze if local weather change will drive the Antarctic Ice Sheet in the direction of a tipping level.

Dr Rosier defined: “The potential for this area to cross a tipping level has been raised prior to now, however our examine is the primary to substantiate that Pine Island Glacier does certainly cross these vital thresholds.

“Many various laptop simulations all over the world are trying to quantify how a altering local weather might have an effect on the West Antarctic Ice Sheet however figuring out whether or not a interval of retreat in these fashions is a tipping level is difficult.

“Nonetheless, it’s a essential query and the methodology we use on this new examine makes it a lot simpler to determine potential future tipping factors.”

Hilmar Gudmundsson, Professor of Glaciology and Excessive Environments labored with Dr Rosier on the examine. He added: “The potential for Pine Island Glacier coming into an unstable retreat has been raised earlier than however that is the primary time that this chance is rigorously established and quantified.

“It is a main ahead step in our understanding of the dynamics of this space and I am thrilled that we now have now been capable of lastly present agency solutions to this vital query.

“However the findings of this examine additionally concern me. Ought to the glacier enter unstable irreversible retreat, the influence on sea degree could possibly be measured in metres, and as this examine exhibits, as soon as the retreat begins it is perhaps not possible to halt it.”


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