Sunday, July 17, 2011

Why Hasn’t The Earth Warmed In Nearly 15 Years?


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There is no statistically significant warming trend since November of 1996 in monthly surface temperature records compiled at the University of East Anglia. Do we now understand why there’s been no change in fourteen and a half years?

If you read the news stories surrounding a recent paper in the Proceedings of the National Academy of Sciences by Boston University’s Robert Kaufmann and three colleagues, you’d say yes, indeed. It’s China’s fault. By dramatically increasing their combustion of coal, they have increased the concentration of fine particles in the atmosphere called sulphate aerosols, which reflect away solar radiation, countering the warming that should be occurring from increasing atmospheric carbon dioxide.

Further, if this is true, then (as is usual in climate-world), “it’s worse than we thought.” After all, China will eventually reduce their sulfate emissions as their population becomes affluent enough to demand something better than miasmic air. Indeed, they are already beginning to clean things up, and when they finally do, all the cooling particles will be gone and the earth will warm substantially.

Reality may be a bit simpler, or much more complicated. But the reason this is all so important is that if there is no good explanation for the lack of warming, then an increasingly viable alternative is that we have overestimated the gross sensitivity of temperature to carbon dioxide in our computer models.

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