Mann 08 The Missing Data
Posted by Jeff Condon on September 15, 2008
On September 5, 08, on the Mann site for the creation of the hockey stick Michael Manns published data used to generate his latest hockey stick paper showed 1357 series. His final paper referenced only 1209 with no mention of why the original series weren’t used. I have obtained a copy of the original data by a link at Climate Audit and decided to plot it here.
First, a graph of all the proxies together.
Then I took an average of all the data rejected before use in the latest hockey stick.
I thought I found the MWP. The Yellow line is 100 year average of the first curve. But I noticed the two smooth blue arcs between 300 and 1000 years in the first graph. These are two series from Fisher so I plotted the trend without them.
Looking at this last graph, the MWP is also quite strong mwp in comparison with the data he actually used plotted on fig 4 for comparison.
Take the end slope of Fig 4 and the end of the graph peaks at about 0.4 while at 600 AD the max peak is at about 0.8. On Fig 3 the max peak at the recent end is aobut2.5 while the MWP range from 0 – 700 several times reaches about 0.7. If we remember that the 1900-2000 year period is scaled to match recent temperature it would result in a strong magnification fo the MWP. I’m not saying that is why this data was scrapped, I’m just pointing out what I noticed.
I wonder what percentage of this would pass the “calibration”.
If anyone wants a copy of the spreadsheet data for this graph add it in your comments and I will send it by email. Commenter emails are visible to me only so no need to write it for everyone.
Check out the next post, I compared the 1209 data series which were used to the original copies of the same 1209 series in the deleted dataset. How much would you bet that there are some changes. It’s pretty amazing.