Arctic sea ice volume refreeze has come 99% of the way since Summer Minimum per March 23rd. The lowest volume year ever, 2017, by the same date, was at 85%.
Q: Where’s the data source for this plot?
A: Here: http://psc.apl.uw.edu/research/projects/arctic-sea-ice-volume-anomaly/data/
Q: How can anyone know if there is a full refreeze?
A: Easy. Use a computer. If you have e.g a 17 thousand km³ volume melt, and then the refreeze is also 17 thousand km³, then you have a full, or 100%, refreeze.
Q: Why would I even do that?
A: Let’s say you want to know how much ice refreezes compared to how much ice that melted away.
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