Arctic sea ice extent meltdown has come 34% of the way from Winter Maximum to a Blue Ocean Event per June 21st. The lowest extent year ever, 2016, for comparison, was also 34%.
A: Here: https://ads.nipr.ac.jp/vishop/#/extent
Q: How can anyone know if there is a Blue Ocean Event?
A: Easy. Use a computer. If you have less than 1 million km² sea ice extent in the Arctic, then you have a Blue Ocean Event.
Q: Why would I even do that?
A: Let’s say you want to know when the Arctic Ocean goes ice–free. Basing this on satellite measurements instead of gut feeling makes your conversations more interesting.
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