The chances for a total meltdown at the pole are higher than ever because the layer of ice coating the sea is thinner than ever, he said.
"A large area at the North Pole and surrounding the North Pole is first-year ice," Serreze said. "That's the stuff that tends to melt out in the summer because it's thin."
Preliminary February and March data from a NASA satellite shows that the circle of ice surrounding the North Pole is "considerably thinner" than scientists have seen during the five years the satellite has been taking pictures, NASA ice scientist Jay Zwally said Friday. He thinks there is slightly less than a 50-50 chance the North Pole will be ice-free.
Last year was a record year for ice melt all over the Arctic and the ice band surrounding the North Pole is even thinner now.
There is nothing scientifically significant about the North Pole, Serreze said. But there is a cultural and symbolic importance. It's home to Santa Claus, after all. Last August, the Northwest Passage was open to navigation for the first time in memory.
A more conservative ice scientist, Cecilia Bitz at the University of Washington, put the odds of a North Pole without ice closer to 1 in 4. Even that is far worse than climate models had predicted, which was 1 in 70 sometime in the next decade, she said.
But both she and Serreze agree it's just a matter of time.