Amount of ice is not expressed in surface area.
You also might want to read the fine print of the graph. This is a representation of square blocks that are (from the top of my head) 1 mile by 1 mile. If there is 15% ice coverage in that square mile, it is counted as a full square mile of ice, even tough it might be 85% open water.
Also note that the ice has lost about half of its thickness and that multi year ice is basically reduced to almost non existent.
You also might want to read the fine print of the graph. This is a representation of square blocks that are (from the top of my head) 1 mile by 1 mile. If there is 15% ice coverage in that square mile, it is counted as a full square mile of ice, even tough it might be 85% open water.
Also note that the ice has lost about half of its thickness and that multi year ice is basically reduced to almost non existent.
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