the Air Vent

Because the world needs another opinion

Posts Tagged ‘tree’

The 800lb Gorrilla in the Hockey Stick’s Locker Room

Posted by Jeff Id on December 1, 2008

Divergence is a serious problem in tree ring climatology reconstructions. Basically divergence means data which years ago vaguely correlated to temperature, diverged from temperature in recent years. So trees which used to be thought of as good thermometers — aren’t. This doesn’t stop scientists from using them however but some creativity in handling this inconvenient data is required. For instance, Mann 08 chopped off the divergent parts and pasted on his own non-divergent data.

In September 2007 Dr. Craig Loehle published a paper on the non-linear nature of tree growth. He holds a PhD in Mathematical Ecology and has published more than 100 papers in applied mathematics and ecology. In short he is the closest thing to an expert we could hope for on tree growth response to temperature. This paper is available on line at the link below.

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An ode to the Great Thermometer Tree

Posted by Jeff Id on October 18, 2008

On a the edge of a cliff, at the end of the rainbow, lie the hopes of dendroclimatology

A stout trunked ten thousand year old oddity

Impervious to wind, rain, sun and fog

With a heart of wood and the full bark of a log

No insect can harm it

No woodcutter can farm it

With secrets hidden for only the enlightened few to see.

What will you reveal, what will we see, when we finally find
The Great Thermometer Tree.

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