I don't know or care what the red dot is ploting, if anything. The post ice dam break dumped, in late June 2012, the largest volume ever of Mackenzie river water in history very quickly - so quick that it did not cool down to 12C until it started to melt ice. 2012 is a rare anomaly that should just be ignored (and was in the exponential curve fit.) The 2012 anomaly is well understood. The worst ever anomaly (1981 / 82) was probably due to same effect. After it also a few years passed before return to normal trend was restored. - See final graph.
Above is sea surface temperatures where the Mackenzie River hits the Beaufort Sea on June 14, 2012 a week or so before the ice dam broke.
Satellite image from July 5, 2012, shows the way warm (up to 12C) water flooded the Beaufort Sea after the ice dam broke.
It may take a year for that massive and sudden injection of warm water to completely cool down to the ice's temperature, and the volume of ice to recover back to its relatively steady exponential decline curve.
Note: A large part of why the last few cycles are below the trend line is that this line is a LINEAR fit to an exponentially (due to at least six known positive feed backs feeding on each other.) - I. e. that is by definition almost requiring an exponential fit. (ANY effect that increases by the prior effect is exponentially growing.) Note also, for the same reason all of the prior decade is above the linearized trend line - That is what happens when exponential effects are linearized and then used for projections into the future, as the IPCC does.
It may take a year for that massive and sudden injection of warm water to completely cool down to the ice's temperature, and the volume of ice to recover back to its relatively steady exponential decline curve.
Note: A large part of why the last few cycles are below the trend line is that this line is a LINEAR fit to an exponentially (due to at least six known positive feed backs feeding on each other.) - I. e. that is by definition almost requiring an exponential fit. (ANY effect that increases by the prior effect is exponentially growing.) Note also, for the same reason all of the prior decade is above the linearized trend line - That is what happens when exponential effects are linearized and then used for projections into the future, as the IPCC does.
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