It's been quite some time since I took stats, but wouldn't six standard deviations put it in the true outlier category? If I'm even twenty percent correct in what I'm trying to communicate, that's frightening.
Person who does lots of stats checking in. That's a good question. We usually refer to Sigma (1-sigma, 2-sigma... 6-sigma) as the probability that an observation could occur by random chance.
The probability of 6-sigma occurring by random chance is about 1:1-billion.
So you're definitely right to characterize it as an outlier. In terms of sea-ice this means that based on our observations of ice extent recorded going back to 1989 (based on the image) it is extremely unlikely we would expect to observe a sea ice extent so far below the norm suggesting something else (climate change) explains the deviation.
What makes this worse is this is the deviation from the 1991-2020 mean, the hottest period of recording. If we compared with even 1981-2000, it would be even worse.
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.
Side note: Repost from other spots on the Fediverse about this news - not karma whoring, just figure the best use of the sense of impending doom is to take action.
(Zachary Labe is a climate scientist, Eliot Jacobson is a professor of mathematics)
My impression:
Ice extent is far below normal, 2023 is the worst year on recent record.
Ice volume has not responded dramatically yet (it has inertia) and there exists a year on recent record worse than 2023 - but it will respond soon enough.
Overall, I'm not sure if plotting a graph with standard deviations as the unit of measure is a good choice. It helps shake people up from sleep - yes. You typically look for standard deviations to determine if something is happening - and 6 deviations is considered solid proof. But to examine the quantity of ice, you measure square and cubic kilometers.
Ah yes, 1989. That's when artic ice started, yep. Totally. I hear tell of the days of '88 when the lizard people in charge decided they needed a REALLY big freezer. Next year, boom. Artic ice.
I'm really, REALLY tired of all this climate alarmism that ignores thousands of millions of years of history that we could study. Instead, sensationalists want to be heard more than they actually want to say anything and hyperfocus on the right now this second. Do you know how uncommon it is for the average person to know that were still in an iceage, geologically speaking?
Yeah, why don't people compare satellite pictures of sea ice now to the satellite pictures of sea ice from 10000 years ago? I'm sure they're just trying to cover up secrets by not using that data.
They, much like you, are missing the point. We went from dinosaurs to cataclysmic post impact winter and life survived just fine. In fact, our species managed to evolve along the way, ice ages and super volcanoes be damned. Nothing humanity can do will "kill all life on the planet" or whatever other stupid shit they're pedaling these days. We're the hardest species to kill on this planet by FAR given any sort of prep time. Humanity will almost certainly survive whatever the climate can throw at us. And life in general survived everything short of another planet thrown at it so far. Things are just going to change. And life will adapt.