I almost called this yesterday, but I needed more data to be sure. All of the data I’ve looked at agrees, Arctic sea ice is now on the upswing, and in a big way.
Here is the plot from NSIDC:
This graph from Wipneus shows the abruptness of the change:
And the physics of ice is also a dead giveaway. Here, the Arctic temperature shows a dramatic upswing.
This is why: when water freezes it releases its specific latent heat.
The specific latent heat is the amount of energy required to convert 1 kg (or 1 lb) of a substance from solid to liquid (or vice-versa) without a change in the temperature of the surroundings — all absorbed energy goes into the phase change — is known as the specific latent heat of fusion.
For water, that’s about 334 KiloJoules of energy per kilogram.
Added: Note that in the…
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