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This map shows the extent of Arctic sea ice in July 2014. It was 3.19 million square miles (8.25 million square kilometers). The magenta lines show the 1981 to 2010 median extent for that month. The black cross indicates the geographic North Pole. NBC

Giant Waves Pose New Risk for Ships in Ice-Diminished Arctic

Aug 11, 2014

Monster waves should be added to the list of hazards faced by ship captains as they plot a course through the waters of the Arctic Ocean, according to a new study that reports observations of house-sized swells in seas that until recently were covered in ice year-round.

"Waves always pose a risk to working at sea," study author Jim Thomson, an oceanographer at the University of Washington in Seattle, said via email to NBC News from off the coast of northern Alaska. "The unique thing about the Arctic is that it is changing so rapidly that we cannot apply past measurements to understand future risk..."

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