Obama’s science advisor John Holdren says that an ice-free Arctic would never refreeze.
I know that is true because down here at the 40th parallel in Colorado, when the lakes thaw out every year, they never freeze up again. Same goes for the Hudson Bay, Kara Sea, etc.
Once water thaws, it can never freeze again. This is based on the same principal as lightning not being able to strike the same place twice.