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Saturday, June 21, 2014

The Coming Ice Age

David Archibald writes at the American Thinker:
... one of the best predictions of climate ever made (weighted for distance and accuracy) was by two Californian researchers, Leona Libby and Louis Pandolfi. In 1979, they used tree ring data from redwoods in Kings Canyon to make a remarkably accurate forecast. From a Los Angeles Times interview of that year,
When she and Pandolfi project their curves into the future, they show lower average temperatures from now through the mid-1980s.  “Then,” Dr. Libby added, “we see a warming trend (by about a quarter of 1 degree Fahrenheit) globally to around the year 2000.  And then it will get really cold—if we believe our projections.  This has to be tested.”  
How cold? “Easily one or two degrees,” she replied, “and maybe even three or four degrees.”
 Recent tree ring data confirms Libby and Pandolft's predictions.
The tree ring readings of the Finnish foresters are predicting a large decline in temperature bottoming out in about 2045. The downturn you see on the right hand side of the graph is as large as any in the last 200 years.
 [And] we now have a way of cross-checking the tree-ring based predictions. A just-released climate model using a notch-delay filter has the promise of providing much higher resolution in climate forecasting. Using historic TSI data, the model can see out to 2025:
... The figure above shows the model output plotted against the UAH temperature record. It shows a very steep decline starting in late 2014 and ending in June 2016. After that it trends sideways for the rest of the decade. The green box shows the expected temperature range in this period. The predicted decline to mid-2016 is 0.6°C. That is not remarkable in itself. There are a few declines of that magnitude in the 34 years of the satellite record. The remarkable thing will be that the temperature will not bounce back. 
We can predict out a further couple of decades using a prediction of Solar Cycle 25 peak amplitude of 7 (Livingstone and Penn) and the Lean 2000 TSI reconstruction back to 1610 as an indication of what TSI will fall to under Dalton/Maunder Minimum-like conditions:
... The figure above plots the notch-delay model output against the Central England Temperature (CET) record. The hindcast match is good. The interesting thing is that the projected temperature decline of 3.0°C is within the historic range of the CET record. The low is reached about 2045, lining up with the projection from the Finnish tree ring study. Maunder and Dalton Minimum-like levels of solar activity will be associated with temperature levels similar to those recorded during these minima.
 Archibald then discusses the impact on agriculture due to temperature declines, and concludes:

All things considered, the production decline for U.S. agriculture could be 8% per 1°C. A fall of 3°C and the United States would be out of export markets for agricultural products, with the same true of most mid-latitude grain exporters. This will have profound geopolitical implications -- namely, starvation and collapse for countries that import food. That’s for next decade. This decade, once the temperature decline is widely apparent, currently importing countries around the world will rush to stockpile, bringing forward the price effect of scarcity. ...
Read the whole thing.

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