Search Results for: hide the decline

Lewandowsky and “Hide the Decline”

Ethics bait-and-switcher Stephan Lewandowsky and his sidekick, Klaus Oberauer, have added hide the decline to their repertoire at the University of Western Australia blog. As CA readers are well aware, the Briffa et al 2001 reconstruction, based on 387 tree ring density chronologies, goes down in the latter part of the 20th century – clearly […]

Severinghaus and “Hide the Decline”

One of the very first contributions to realclimate was an FAQ from Jeff Severighaus on Dec 3, 2004. A year earlier, Severinghaus attempted (unsuccessfully) to get an explanation of the “divergence” problem from Mann and the rest of the Team. Severinghaus had become interested in the question following a presentation by Tom Karl of NOAA […]

Hide the Decline: Sciencemag # 3

The day before yesterday, I reported that Briffa and Osborn (Science 1999) had not just deleted the post=1960 decline (see also CA here), but had deleted the pre-1550 portion as well – the deletions contributing to an unwarranted rhetorical impression of consistency between the reconstructions, an impression that was capitalized upon in the commentary in […]

Hide the Decline – the Other Deletion

I recently re-visited an article in Science (Briffa and Osborn 1999), that, together with Jones et al 1999 (Rev Geophys), were the first bites of the poison apple of hide-the-decline. I observed that key conclusions in Briffa and Osborn 1999 depended on the rhetorical effect of deleting the decline from their spaghetti graph.

Hide the Decline: Sciencemag

Science published one of the first spaghetti graphs (in Briffa and Osborn 1999 here) as part of an invited comment on the Mann et al 1000-year reconstruction, then hot off the press with its supposed proof that 1998 was the “warmest year” of the millennium. Jones et al 1999, discussed recently here, contained a different […]

New Light on “Hide the Decline”

In today’s post, I’m going to discuss a previously undiscussed example of “Hide the Decline”, one that precedes Briffa and Osborn (Science 1999), the earliest example discussed so far. CRU did not report it in their submission to Muir Russell. Jones et al 1999 (Rev Geophys) was published in May 1999, the same month as […]

Judy Curry on Hide the Decline

Huge comment traffic at Judy Curry’s discussion of Hide the Decline here and here

Hide the Decline II

On March 8, Michael Mann’s lawyers, Cozen O’Connor, sent a legal letter to Minnesotans for Global Warming (of the famous Hide the Decline video) threatening them, ironically, with misappropriating Mann’s likeness and, almost as an afterthought, defaming him “by leaving viewers with the incorrect impression that he falsified data to generate desired results in connection […]

Inventory of Hide-the-Decline

In a recent post, I reported on the diagram in Jones 1998 (Science), which pushed hide-the-decline a year earlier than my previous inventory. (The Briffa bodge, an earlier technique, dates back to 1992 and Jones 1998 is a sort-of transition from the Briffa bodge to truncation as hide-the-decline technology.) I’ve had a few requests for […]

The Original Hide-the-Decline

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 […]