December 10, 2009

Take a look at the ice...



Watts Up With That? has a cool piece by J. Storrs Hall, Hockey stick observed in NOAA ice core data:

...One thing that Climategate does is give us an opportunity to step back from the details of the AGW argument and say, maybe these are heat-of-the-moment stuff, and in the long run will look as silly as the Durants' allergy to Eisenhower. And perhaps, if we can put climate arguments in perspective, it will allow us to put the much smaller nano arguments (pun intended) into perspective too.

So let's look at some ice.

I'm looking at the temperature record as read from this central Greenland ice core. It gives us about as close as we can come to a direct, experimental measurement of temperature at that one spot for the past 50,000 years. As far as I know, the data are not adjusted according to any fancy computer climate model or anything else like that.

So what does it tell us about, say, the past 500 years? (the youngest datum is age=0.0951409 (thousand years before present) — perhaps younger snow doesn't work so well?) [Shows a graph from 1400 to present, with noticeable rise after 1850]

Well, whaddaya know — a hockey stick. In fact, the "blade" continues up in the 20th century at least another half a degree. But how long is the handle? How unprecedented is the current warming trend?...

Then the author "pulls the camera back," and shows us the same temperature graph from AD 800 to the present... Most interestin'...

And then a broader view, 3,000 BC to present..... then 9,000.... then 50,000...

Posted by John Weidner at December 10, 2009 7:47 PM
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