Yes, everyone knows it, but he keeps lying about it:
.... CA readers will also remember Mann’s famous and vituperative denial that any climate scientist had ever spliced proxy and instrumental data in one of the earliest and most cited Real Climate posts Myth vs. Fact Regarding the “Hockey Stick”. A Real Climate reader had observed:
Whatever the reason for the divergence, it would seem to suggest that the practice of grafting the thermometer record onto a proxy temperature record – as I believe was done in the case of the ‘hockey stick’ – is dubious to say the least.
To which, Mann responded with a vociferous denial that such grafting had ever occurred:
No researchers in this field have ever, to our knowledge, “grafted the thermometer record onto” any reconstrution. It is somewhat disappointing to find this specious claim (which we usually find originating from industry-funded climate disinformation websites) appearing in this forum…
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Even in the face of the Climate Audit demonstration two days earlier of splicing of proxy and instrumental data in the WMO 1999 diagram that had been the subject of the notorious email, Mann continued to deny that he and coauthors had ever grafted instrumental and proxy data into a single curve, .........
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In the same inline comment, Mann opaquely conceded that instrumental and proxy data had been spliced in the smoothed Mann et al 1998, 1999 reconstructions:
In some earlier work though (Mann et al, 1999), the boundary condition for the smoothed curve (at 1980) was determined by padding with the mean of the subsequent data (taken from the instrumental record).
On November 24, 2009, in a press statement, one of Mann’s coauthors in the WMO 1999 graphic, Phil Jones of CRU, admitted the splicing in the WMO 1999 diagram, but Mann did not correct his previous denials.
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http://climateaudit.org/2015/01/08/more-mann-grafting/
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First, here is Figure 1, entitled “Hockey stick graph” of rising global temperatures. Sharp-eyed readers will notice that the Figure goes to 1998 or so, and that it grafts the instrumental record after 1902 onto the proxy record before 1901, with the grafting not mentioned in the caption.
Figure 1. Mann 2015 entitled: “Hockey stick graph” of rising global temperatures
Next, here is a blowup of Mann 2015 Figure 1, confirming that it is a graft of the MBH99 instrumental data from 1902 to 1998 (plotted in yellow) to the MBH99 proxy reconstruction prior to 1901.
Figure 2. Excerpt from Mann 2015 Figure 1, showing MBH99 proxy reconstruction (cyan) to 1901; MBH99 instrumental version from 1902-1998 (yellow.)
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