North Pole may be ice-free in summer, expert says

WASHINGTON — There's a 50-50 chance that the North Pole will be ice-free this summer, which would be a first in recorded history, a leading ice scientist says.

The weather and ocean conditions in the next couple of weeks will determine how much of the sea ice will melt, and early signs are not good, said Mark Serreze. He's a senior researcher at the National Snow and Ice Data Center and the University of Colorado in Boulder, Colo.

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.

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.

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.

"I would guess within the next 10 years it would happen at least once," Bitz said.