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09-04-14, 19:19 | #1 |
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Glaciers Melting 77% Faster than 40 Yrs Ago
Antarctic Glaciers Melting 77% Faster than 40 Years Ago: Sea Levels will Rise by FOUR FOOT if they Collapse Completely
Hugh glaciers in Antarctica are shedding ice at a much faster rate than expected, a new report claims. The amount of ice draining from six massive glaciers in West Antarctica has increased by 77 per cent between 1973 and 2013, according to the report findings. Researchers studied the Pine Island, Thwaites, Haynes, Smith, Pope and Kohler glaciers, which discharge ice into the Amundsen Sea Embayment. Ice from just these six glaciers accounted for 10 per cent of the world's sea-level rise between 2005 and 2010, the study by the University of California-Irvine claims. Cracks in the ice: Six of the fastest flowing glaciers in Antarctica are shedding ice at an accelerated rate This means the six glaciers are discharging nearly the same amount of ice as the entire Greenland ice sheet. Pine Island Glacier, the most active of the glaciers studies which has made headlines after dropping huge icebergs into the sea, is discharging 75 per cent more ice into the ocean than it was 40 years ago. The widest glacier included in the research - Thwaites Glacier - started to have accelerated levels of ice loss in 2006. Concerning: A massive crack can be seen across the Pine Island Glacier in this satellite image. The glacier is shedding 75 per cent more ice into the ocean than it was 40 years ago Jeremie Mouginot, a glaciologist at UC-Irvine and co-author of the paper, said: 'What we found was a sustained increase in ice discharge—which has a significant impact on sea level rise.' The researchers studied cracks on the glaciers every year to see how much they had spread and to calculate ice discharge. If the glaciers were to collapse completely, sea levels would rise by another four feet (1.2 metres), claims fellow report co-author Professor Eric Rignot. 'To see Thwaites, this monster glacier, start accelerating in 2006 means we could see even more change in the near future that could affect sea level,' Mouginot added. If the six glaciers studied were to collapse completely, sea levels would rise by a catastrophic four feet He added that the acceleration in glacier flow is being aided by warmer ocean waters. Huge ice streams flowing from West Antarctica are held back by floating ice shelves that act like dams. But recent studies have suggest the warmer ocean water is melting and thinning these ice shelves from below. This means the ice shelves give less resistance to the streams, forcing more ice into the ocean. Cracks can be seen running across the Pine Island Glacier Ice Shelf. It is believed warmer ocean water is contributing to the acceleration of the glaciers
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