That loos horrible!
Mostly wind-driven, I think. Temperatures over most of the area aren't really warm; most of the region the area shown is between -10 and -20C. There may be melt at the edges of the Barents and around Svalbard, which is where there appears to be major up-welling of warmer water from the North Atlantic Drift/Norwegian current, but that's been true all winter.
Those temperatures are not particularly *cold* either, which this time of year is not good for the run up to the solstice.
We are still 3-4 weeks away from the point at which increased insolation will start making itself felt. Until then, the lion's of what we see in numbers changes in either direction will be a function of wind driven compaction or dispersion. Even after that, there will be multiple weeks of lag as the heat accumulates to sufficient levels to permit active melting.
[edit] Adding an image for SST's from NOAA. I think it is worth noting that all across the region, they are above normal, someplaces remarkably so. However, it's not the areas outside of the pack that concern me - it's the areas *inside* that are 0.25-0.5C warmer than normal. That means movement - and associated ekman pumping - may bring a lot of heat to bear on the ice a lot earlier.
There may be a giant lurking under the ice, waiting for the right moment to reveal himself.