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Thursday, 12 March 2020 18:51

Greenland and Antarctica ice loss accelerating

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Earth's great ice sheets, Greenland and Antarctica, are now losing mass six times faster than they were in the 1990s thanks to warming conditions. A comprehensive review of satellite data acquired at both poles is unequivocal in its assessment of accelerating trends, say scientists. Between them, Greenland and Antarctica lost 6.4 trillion tonnes of ice in the period from 1992 to 2017. This was sufficient to push up global sea-levels by 17.8mm.  "That's not a good news story," said Prof Andrew Shepherd from the University of Leeds in the UK.

"Today, the ice sheets contribute about a third of all sea-level rise, whereas in the 1990s, their contribution was actually pretty small at about 5%. This has important implications for the future, for coastal flooding and erosion," he told BBC News. 

It's a team of experts who have reviewed polar measurements acquired by observational spacecraft over nearly three decades. These are satellites that have tracked the changing volume, flow and gravity of the ice sheets. Greenland and Antarctica are responding to climate change in slightly different ways. The southern polar ice sheet's losses come from the melting effects of warmer ocean water attacking its edges. The northern polar ice sheet feels a similar sort of assault but is also experiencing surface melt from warmer air temperatures//BBCnews

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