I looked more closely at p159. It only reports hourly and has a lot of missing drift speed data. The animation probably struggles to process it correctly with the other buoys.
Temperature profiles for all the buoys I could find with thermistor data. M29, t63 and t70 appear to show bottom melt. I'd welcome any expert opinion on interpreting the near surface temperatures.
Wow Sir!
You may have just set a New world records for the most information anyones ever crammed into a 40 second silent video.
I'm counting 6 that are melted out or in holes full of water, possibly malfuct.
Apart from that...
Am I correct the thermistors are 2cm spacing?
If so, the rest look between about 70cm and 150cm.
With the exception of t61. The bottom of that on may be off the graph. Was that the one in a pressure ridge? There kinda looks like a bit of a flat toe right at the end, though at about minus three C. Its probably soggy with brine thats been leached down from above from there to Its ragged butt.
Theres a couple that have lumps of higher temps near their bottoms, which if not sensor failure could be the result of being freely plumbed to melt ponds and finished with their initial brine flushing cycle. Hence fresh enough for the warmer surface heated water to be denser than cold melt water, and therefore be busily engaged in burrowing for freedom.
If 61 has a longer string I'd love to see, say the last month of the whole thing. Core temp is still below top and bottom temps on that chart, though rising steadily. If Its on a ridge melt ponding probably won't confuse things, and it would be very interesting observing the dynamics of Its deep keel as it melts.
Overall most of them seem about 1m thick, and probably melting both top and bottom. FollowMosaic site has been listing -1.5 or -1.6 water temps this last week. Which is about 0.3C above melting at local salinity. So the ice bottom temp is clamped at about minus 1.8, and the top of the ice at about 0C.
61 could actually be melting at -3C in Its Briney nether regions, and for that matter quite probable that dips below -1.8C in the cores of any the rest is due result to brine pockets chewing their innards into honeycomb ice. Rather than not yet being at thermal equilibrium as some may assume. One to two days above melting point is sufficient for that in such thin and young ice.
Around 1m thick agrees with Hycoms chart in that region. The "fortress" and PS are about 100km into the pack, directly nth of Svalbard by my guestimascione right now. Not sure how widely spread the buoys are. 1 degrees latitude is a smidge over 110km up there (just over 111 near the equator). Longitude much less and less again further north of course.