Personally, I will be particularly interested to see how well various thickness/volume models will agree (or disagree) with these in situ observations.
Polarstern at 84.3N 31.0E 15-08-26 06:00:
Air temperature dropped to -5.1°C, water decreased to -1.7°C.
Observed ice thickness category increased
- Predominantly medium first-year ice (70-120 cm thick) and thick first-year ice (>120 cm thick) and some thinner (younger) first-year ice
This seems to be in general agreement with Copernicus Marine Service formerly known as MyOcean TOPAZ model, see below