Thanks for the animation. ~700 pixel width is the trick.
And, are you sure it's a current and not wind-driven? If it's a current it's really bad news.
Ther looks to be melt on Asian side going thru Bering strait last little while, so I was thinking the same thing. Someone else also posted a sst animation that suggested that as well
But past Wrangel Island is a long way, there's no melting goodbye waves in that polynya