The Original Hide-the-Decline

Climate Audit

In a twitter exchange among Jean S, Ronan Connolley and Tim Osborn, Ronan drew attention to an early spaghetti graph in a comment on MBH98 published by Phil Jones in Science on the day after (Apr 24, 1998) publication of Mann et al 1998. The Briffa reconstruction is in purple below. Like IPCC 2001, it hides the decline in the Briffa reconstruction (here a 1998 version) by deleting late 20th century values – here after 1950.

jones_comment-on=mbh98
Figure 1. From Jones 1998 comment on MBH98. Orange – Mann et al 1998; green – Jones et al 1998; purple – Briffa et al 1998.

Jones stated that all three reconstructions “clearly show” that the 20th century is the warmest in the 600-year period, with the most “dramatic feature” being the 20th century rise:

Despite the different methods of reconstruction and the different series used, or alternatively, because a few good ones are…

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