## Tuesday, November 20, 2007 ... /////

### Craig Loehle: Medieval Warm Period is back

There have been many peer-reviewed or at least published skeptical climatological studies but I didn't have enough time to give you a report. In this weekly dose, C. Loehle in Energy and Environment, vol. 18, No. 7+8, 2007, takes the average of 18 stations: click at "Download file" on that page to receive a PDF file. Also, feel free to download the CSV file for Excel.

Figure 1: Temperatures in the last two millenia.

Craig Loehle has eliminated tree ring series from his datasets, explaining that they don't seem to be good temperature proxies. The result is a new kind of a hockey stick, the so-called zig-zag hockey stick. ;-) The new blade in the middle of the stick is called the Medieval Warm Period.

For an audit of Loehle's paper, see McIntyre I, McIntyre II.