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Greenland's extraordinary rainfall and melt event could portend faster ice melt

A recent satellite image of the southwestern portion of the Greenland Ice Sheet shows the existence of cerulean blue pockmarks — phenomena that provide scientists with a worrying message about sea-level rise and the risk of massively consequential changes in ocean behavior.

Why it matters: The melt ponds, rivers and moulins, cracks in the ice where surface water can plummet to where the ice sheet meets bedrock, are a symptom of a summer season that has brought large spikes in melt extent.

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