Monday, July 04, 2011

From a Distance, the Hockey Stick Looks Unimpressive

Prolific and innovative thinker and scientist J Storrs Hall takes a look at where the climate has been, compares current climate with similar climate curves in the past, and slyly invites readers to guess where the climate is likely to be heading.

First -- Where the climate has been over the past 10,000 years or so... :
Images from WUWT

Next -- Comparing our current climate curve with similar climate curves from the past, to get an idea of a possible trajectory... :
Here I’ve plotted the 400 years following each minimum in the record that leads to a sustained sharp rise. There were 10 of them; the first five are plotted in cyan and the more recent 5 in blue. You can see that in the latter part of the Holocene the traces settle down from the wilder swings of the earlier period. Even so, every curve, even the early ones, seems to have an inflection — at least a change in slope — somewhere between 200 and 250 years after the minimum.

The hatched black line is the average of the 5 recent (blue) spikes. The red dots are the uptick at the end of GISP2 and HadSST, spliced at 1850. Note that ALL the minima dates are from GISP2. _WUWT

Then Josh invites readers to guess what will happen next, if history is any guide.

For some parts of the northern hemisphere, it may be time to get out the summer parkas.

Climate simpletons who believe that the global climate is controlled by one trace gas which constitutes less than 0.04% of the planetary atmosphere, have controlled the microphones, printing presses, funding agencies, and public stage for far too long. It is time for science to displace the politically convenient (and economically lucrative) climate hysteria, so that ordinary people can make rational plans.

Previously published at Al Fin Potpourri

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