Could it though be not errors, but intended disinformation? I imagine that people who control HYCOM are well aware that:
- Arctic ice will be gone in September in a few years, and in 2020s, several months of ice-free Arctic ocean will be annual norm;
- Average Joe around the world is quite stupid, but not stupid enough to not realize that if whole Arctic melts, then it means massive warming is going on;
- Average Joe does not fly to Arctic himself, nor has any trusted peers who do, therefore he's only able to know that Arctic melted if specialists tell him it did;
- It is possible, with sufficient effort and money, to make some specialists to make data and reports which are very far from reality;
- It is possible, with sufficient effort and money, to shut up the rest (at least in terms of any significant mass-media, large internet portals included).
Could it be that HYCOM "new" system is just one of first, relatively small, steps of mass-disinformation campaign, one which is only starting as of now, aimed to make public to keep thinking, in observable future, that Arctic sea ice is not a goner (while it actually would be)?