As I have been discussing, NSIDC shows a sharp drop in multi-year ice since the end of July, but very little drop in 1-2 year ice. It makes little sense to me how this selective loss could happen. The video below shows this as a smoother transition :
Julienne suggested that I make a comparable animation of the UIUC concentration maps.
As you can see, there was low concentration ice “above” the pole for a few days in early September – in a region of July multi-year ice. Some of it probably melted out. But why did MYI selectively melt and leave younger ice behind?
Also, it appears that there was a lot of MYI loss north of Canada, in a region where the ice remained high concentration all summer.
I guess we will ses what happens this winter….