Adam, nice job with the maps. The movies for the various O-Buoys are interesting to watch for clues about what happened to each. Mostly it's hard to say exactly, especially since you can only look back two years with the graphs, so the data for the older buoys is inaccessible. A couple of the videos appear to show sky, suggesting that the buoy was tilted.
I'd guess that in many cases where the buoy survived a first winter and made it until the following fall, that the power ran out. I'm assuming that the lithium battery packs wouldn't last a whole year, so solar power would be necessary to continue operation. So it might be lack of sunlight in the fall, or else the buoy being put into a position where it could no longer receive sufficient sunlight -- knocked over or buried in a pressure ridge, for instance.
O-Buoy 14 has continued to update statistics and the camera image, and the power levels look reasonably good. I think it's more of what we've seen already, ice on the camera lens. Looks sunny at the moment, so hopefully we'll get a clear image again later today.
