What's happening in the Beaufort is pretty impressive.
I've captured 8 days of images, using band31-night, with the temperature palette reduced to 230-273K
At the start (4/2), its pretty obvious that the temperatures are fairly low - 243 to 253K / -30 to -20C.
However, as the cracking event progresses, it's clear how extensively it affects the pack as the open sea starts dumping heat into the atmosphere. By the end, temperatures over large stretches are running above -10C, and the cracking has spread to the Chukchi/CAB proper, if you follow the temperature signatures up and to the right. (images will be across two posts.)