Most scientists think when Arctic sea ice essentially vanishes at the end of summer melt season, there will still be some remaining ice near coastlines, for example amongst the Canadian Archipelago islands. Thus, we define what I first coined a Blue Ocean Event as being the first time ice extent in the Arctic Ocean drops below one million square kilometres. I think that this last remaining ice will be circling around the North Pole, above 85 degrees latitude, since it has the least amount of surface melt (low sunlight), and slow bottom melt in a stratified lens of cold, fresh water.
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