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Just a friendly and terrifying reminder that it's currently WINTER in the southern hemisphere.
Though I would like to see the data compared to other El Nino years.
The El nina years are in there (the blue lines) none of them look like this year at all.
That said, this chart is not the best for understanding the actual extent of the sea ice. It doesn't show the amount of sea ice, it show how much there is relative to earlier years. The actual amount of sea ice is still growing at the moment, as one would expect in winter. Just not as much as earlier years.
I did look into other articles about the Antarctic ice since this graph was only about how different one bit is to the next, rather than any numbers for it to gain any substantial meaning. From the other article I read, we are losing 150 billion tons of ice per year since 2010.. and a factor of 6 change over that is.. terrifying.