Four years after my infamous battle with Walt Meier at The Register, I have found the evidence that I was correct all along. It was right under my nose.
In 2007, NSIDC published this map for week 29 (the current week)
This agrees very closely with the Cryosphere today map for 7/20/ 2007.
But it doesn’t agree at all with the official NSIDC extent map from July 2007
I flattened and overlaid the Fowler week 29 2007 map (red) on the current NSIDC map (green) and guess what – there is a lot more ice in 2012 than there was on the same date in 2007.
Something is wrong with the NSIDC database. They show more ice in 2007, and that is simply not correct. Their own map proves it.
Walt Meier was trying to get me to take the blame or pin the problem on CT, but it looks like NSIDC was at fault. There is a lot more ice in 2012 than there was on this date in 2007.
Here are two satellite images which confirm that the ice edge was several hundred miles further north in 2007
