Greenland and Antarctica ice loss accelerating

GREENLAND: 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 media. 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.

The team has used the latest milestone to offer some general remarks. The key one is the recognition that ice losses are now running at the upper end of expectations when compared with the computer models used by the authoritative Intergovernmental Panel on Climate Change (IPCC). In the panel’s 2014 assessment, its mid-range simulations (RCP4.5) suggested global sea-levels might rise by 53cm by 2100. But the Imbie team’s studies show that ice losses from Antarctica and Greenland are actually heading to much more pessimistic outcomes, and will likely add another 17cm to those end-of-century forecasts.