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    Home»Politics»Antarctic Study Reveals "Tipping Point" For Runaway Melting Of Ice Sheets
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    Antarctic Study Reveals "Tipping Point" For Runaway Melting Of Ice Sheets

    AdminBy AdminJune 25, 2024No Comments3 Mins Read
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    Scientists have discovered a new tipping point toward “runaway melting” of Antarctic ice sheets, caused by warm ocean water intruding between the ice and the land it sits on, according to a study published on Tuesday.

    While this type of melting has been previously studied, models used by the United Nations Intergovernmental Panel on Climate Change (IPCC) to project the impact of global warming on the Antarctic have yet to factor in this phenomenon.

    They have also systematically underestimated ice loss seen thus far, said the study, published in the journal Nature Geoscience.

    As ocean temperatures rise due to human-caused global warming, Antarctic ice sheets are melting, threatening a rise in global sea levels and putting coastal communities at risk.

    “Increases in ocean temperature can lead to a tipping point being passed, beyond which ocean water intrudes in an unbounded manner beneath the ice sheet, via a process of runaway melting,” the study said.

    Antarctic ice sheets sit atop the bedrock and extend beyond the coast to float on the sea.

    Previous studies have shown that warm seawater is seeping into the “grounding zone” — where land and ice meet — and further inland from under the floating ice.

    As the water warms, even by a fraction, the intrusion accelerates from short distances of 100 metres (330 feet) to tens of kilometres (miles), melting ice along the way by heating it from below, explained the study’s lead author Alexander Bradley.

    “Every 10th of a degree (of warming) makes these kind of processes closer, these tipping points closer,” said Bradley, a researcher with the British Antarctic Survey.

    The risk to sea-level rise comes when the accelerated melting outpaces the formation of new ice on the continent.

    Some areas of Antarctica are more vulnerable to this process than others due to the shape of the land mass, which has valleys and cavities where sea water can pool beneath the ice.

    The Pine Island glacier, currently Antarctica’s largest contributor to sea-level rise, is at high risk of melting due to the slope of the land that allows in more seawater, the study said.

    Scientific models need to be updated to take into account the element of melt to better predict the risk of sea-level rise in the future and prepare for it, Bradley said.

    “And it really just stresses the need for urgent climate action in order to prevent these tipping points from being passed,” he added.

    (Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)



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