DATE: September 25, 2017
SNIP: After 16 months of consecutive record and near-record lows in late 2016 and early 2017, sea ice extent in the Arctic held fast over the summer thanks to more moderate weather and cooler temperatures. As of September 13, sea ice covered some 4.64 million square kilometers (1.79 million square miles) at its minimum, roughly 1.25 million square kilometers (482,000 square miles) more than record-setting year 2012.
Still, while 2017’s summer melt season didn’t break the record, it falls far below the 1981 to 2010 median extent by over 1.58 million square kilometers (610,000 square miles). Moreover, surface cover isn’t everything when it comes to the state of the Arctic — what experts say matters most is the total volume of ice — a combination of thickness and extent, and 2017 saw summer volumes among the lowest ever recorded.
Some scientists are now saying colloquially that the Arctic Ocean has in recent decades entered the “Thin Ice Age.” Since 1980, the average ice thickness come July has decreased by an estimated 120 centimeters (47 inches).