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We've got 40 years of data on Antarctic sea ice, and over the last 4 decades it's been growing, not retreating. [1] [1]https://nsidc.org/data/seaice_index http

• mistrial9 3y ago
  https://github.com/ICESAT-2HackWeek/sea-ice-tutorials https://github.com/ICESAT-2HackWeek/sea-ice-tutorials
• thedougd 3y ago
  Perhaps you could be more specific with your citation. Nothing jumped out at me. Is this what you're referring to? https://nsidc.org/data/seaice_index/images/s_plot_hires.png https://nsidc.org/data/seaice_index/images/s_plot_hires.png
  • soperj 3y ago
    Yes, that's it. Slope is positive.
• hedgehog 3y ago
  That's an accurate but misleading characterization of the data. Anyone can go eyeball the chart you linked and then read this for context to form a more complete opinion: https://www.climate.gov/news-features/understanding-climate/understanding-climate-antarctic-sea-ice-extent https://www.climate.gov/news-features/understanding-climate/...
  • soperj 3y ago
    How is it misleading when they're talking about "exposing more open ocean to incoming solar radiation and heating" specifically? How is it misleading at all when I've literally just quoted data from a really good site?
    • hedgehog 3y ago
      Presenting a very slightly increasing average antarctic coverage trend over specifically 40 years as a refutation that antarctic polar ice is in retreat is misleading for a couple reasons. First, the last ten years appears to show strongly decreasing coverage trend which shows variability or a change in trend to integrate into any conclusions. Second, over that whole period the minimum coverage has a clear decreasing trend, again that should inform any expectations about where we are going. Are you staking out a claim that antarctic ice is going to increase over the next few decades?
      • soperj 3y ago
        We've had a year with the highest extent ever recorded in the last 10 years. It's a direct refutation of the authors point that it'll continue to decrease and expose more ocean because of compounding effects when it hasn't actually been decreasing. I make no claims that it's going to increase or decrease, I'm not even talking about the future, I'm refuting the author's bad data.
    • orwin 3y ago
      Because while the winter maximum used to increase (5y average) in the last 40 years, the summer maximum decreased (5y average) over the same period. > How is it misleading when they're talking about "exposing more open ocean to incoming solar radiation and heating" specifically? So, if you don't know, during winter there is almost no sun in antartica (and even in the areas you can see it 3 hours a day like in the Kerguelen, it isnt absorbed that much to to a low angle of incidence). So we clearly don't care about random averages of the sea ice over a year, but its state when the sun hit the water, in summer (because the angle of incidence is higher, and also, the sun almost never sets there). That's why your data is correct, but misleading. What's important isn't the ice sheet surface this winter, during june-july-august-september (sorry to over-explain, but i get that this is a complex issue and this bear repeating) but how much ice was present last summer (this winter if you're in the north hemisphere). And this was the lowest we ever had. Do you want more clarifications on specific points? I'm not an expert, and this is a complex subject
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• distortionfield 3y ago
  The trends section in that graph shows all sections of ice in decreasing trends, what the hell are you on about
  • soperj 3y ago
    Only if you're looking at the Arctic, not the Antarctic.
    • distortionfield 3y ago
      Everyone knows it’s only real science if you shrink your scope until data fit your narrative.
      • soperj 3y ago
        Sorry, I'm responding to someone specifically talking about the Antarctic. The argument that you're looking for doesn't exist here.