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Researchers used ice cores to create a 350 year continuous analysis of the melting rate of ice in central west Greenland.

The study was published Wednesday in the peer-reviewed British journal Nature.

According to Trusel, the current thought in the scientific community is that there is a temperature threshold that could trigger a point of no return for the eventual melting of Greenland and Antarctica's ice sheets.

"We are seeing levels of Greenland ice melt and runoff that are already unprecedented over recent centuries (and likely millennia) in direct response to warming global temperatures since the pre-Industrial era", Sarah Das, co-author of the report and scientist at the USA -based Woods Hole Oceanographic Institution said in a statement.

An increased rate of melting was detected in the ice cores beginning in the mid-1800s, which was around the same time as the onset of industrial-era Arctic warming.

The genuine final message is its just two last decades we have observed the unparalleled rise in runoff said Sarah Das, a glaciologist at Woods Hole Oceanographic Institution and co-author on the study.

'We found a 50 per cent increase in total ice sheet meltwater runoff since the start of the industrial era, and a 30 per cent increase since the 20th century alone'.

Researchers said the findings "provide new evidence of the impacts of climate change on Arctic melting and global sea level rise".

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It seems that icebergs which are calving into the ocean from the edge of glaciers are one component of the water re-entering the ocean and this way rising the sea levels. But more than half of the water entering the ocean comes from runoff from melted snow and glacial ice atop the ice sheet.

Ice loss from Greenland is the single largest contributor to global sea-level rise, which is predicted to lead to inundation of low-lying islands and coastal cities around the world over the next several decades and centuries. I am especially enthusiastic about technology, science, and health-related issues. Greenland experiences seasonal melt during the warm summer days, and at low elevations, the melting is more intense.

An ice core is a sample taken from an ice pack with a hollow drill, revealing a cross-section that effectively looks back in time, a bit like the rings of a tree.

The year 2012, in particular, was a standout for ice melt.

Low-lying tropical island states from the Maldives to Tuvalu view Greenland's 3,000-metre (10,000 ft) thick ice sheet with foreboding since it contains enough ice to raise world sea levels by around 7 metres if it all melted, over many centuries. But in contrast, at higher elevations, summer meltwater quickly refreezes from contact with the below-freezing snowpack it lies on - preventing the meltwater from running off. Instead, it forms distinct icy bands that stack up in layers of densely packed ice over time.

Satellite methods to understand melting rates have only been around in recent decades, so the ability to go back further in time was important.

"We need to be aiming for net-zero emissions before 2050".

Additional co-authors are: Matthew J. Evans, Wheaton College; Ben E. Smith, University of Washington; Xavier Fettweis, University of Leige; Joseph R. McConnell, Desert Research Institute; and Brice P.Y. Noël and and Michiel R. van den Broeke Utrecht University.