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Indeed, it appears that this process has already started [14], and this may account for cold northern Hemisphere winters [15].This weakening has occurred alongside an ongoing freshening trend in the high-latitude North Atlantic, possibly resulting from meltwater from the Greenland Ice Sheet, sea ice and increasing river discharge into the Arctic Ocean.This dilution of the surface waters in the ocean could have weakened deep water formation, slowing down the AMOC [15].

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If this ice sheet were to melt completely, it would raise global sea levels around 7.36 m [3, 4].However, taking possible changes in ocean circulation into account, numerical models predict that the total sea level contribution from Greenland is around 1 m for 560 ppm CO scenarios, it still takes hundreds of years to instigate strong surface melt over the entire Greenland Ice Sheet surface.Complete loss is not inevitable, because the Greenland Ice Sheet operates over a long time scale and takes tens of millennia to respond to a temperature of around 2.1°C and a millennium or more for temperatures a few degrees above this threshold [4].Surface melting is driven by air temperatures [2], but some of these losses are offset by increases in precipitation and snow accumulation with increased air temperatures [6, 7].These two processes, surface melting and solid ice discharge across the grounding line therefore have different environmental controls [8].

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