I’ve just been projecting forward the sea ice extent using the statistics the data that I download from the NSIDC. I’ve used the rate of change of the 10th percentile, and applied it from the 16th of April running forward (fig 1) to the extent on that day. If these projections are correct, unsurprisingly the Summer minimum in the Arctic will be a new record low of around 3.7 million square kilometres. This is the first time the extent will have ever fallen under the 4 million level in the satellite series, that should happen at the start of September, which it almost managed to do last year. I’m sure a lot of people are looking at a much lower minimum, but the Arctic has put on a bit of extent this Winter, after suffering substantial losses during the run up to Christmas.
Rather more severe is the Antarctic projection for their upcoming Winter. I see the maximum at around 15.8 million square kilometres in the second week of September, the previous lowest maximum extent was 17.803 at the very start of the satellite series in 1978 (fig 2), so this figure is seriously low if it comes about. This year (the red line) will track much lower than 2017 (the black line), if anything the gap will widen between the two if anything, this is because up until the 28th of August last year the Antarctic was doing very well, with the extent slightly above average, but after that date the extent suddenly collapsed in September when it should really have been peaking. So I reckon that all eyes might be on the Antarctic this September, rather than the Arctic.
I will revisit these projections in September, it maybe by then, that I’ll have some serious egg to wash of my face, who knows my projections could end up being optimistic!
I will be the first to admit that what I’ve done is not scientific in any way, it’s just playing with the statistics of the last 40 years, but what the hell.