The Awful Terrible Horrible Global Sea Ice Crisis

Watts Up With That?

Guest Post by Willis Eschenbach

My examination of objects cryospherical continues. In my last post, The Size of Icy Reflections, I showed that a change of 10% in the global sea ice area translates into a global average of a 0.1 watt per square metre (W/m2) change in reflected sunlight. In this post, I’ll look at what that means given the historical changes in ice area. This will highlight the kind of the curious choices made in the analysis of climate data. To start with, here is the full data from the Hadley Ice and Sea Surface Temperature dataset (HadISST, data link below).

HadISST global total sea ice areaFigure 1. Global total ice area, computed as the sum of 1°x1° gridcell area times the percentage of each gridcell covered by ice. Areas in millions of square kilometres (Mkm^2)

I’m sure you can see the “curious choice” I mentioned before. Clearly, the recent part of the data appears valid…

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