I overlaid today’s DMI data on the NSIDC graph from yesterday morning. NSIDC should be almost brushing up against the mean line, for the first time in more than six years. However, NSIDC made a change yesterday during the day which pushed the ice extent to the left, and the mean off to the right – and thus created a large gap.
Instead of brushing up against the mean line, today’s data will look like this.
Walt Meier at NSIDC said this
“A key point is that this change doesn’t actually change the data at all”
It most certainly does change the data. Crossing above the mean line would be symbolically a very important indicator, given that five years ago people at NASA predicted a possible ice free Arctic in 2012. I am having a very tough time believing that the timing of this is an accident. I have never seen NSIDC change the graph mid-day before. It normally updates at 8am MDT and stays that way the rest of the day.