Tag Archives: overpeck

Varved Inconsistency

Since AR4, there have been a series of new multiproxy studies, several of which were cited in AR5 (Mann et al 2008; Ljungqvist et al 2010; Christiansen and Ljungqvist 2012; Shi et al 2013). A distinctive feature of these and other recent multiproxy studies is the incorporation of varve thickness and near-equivalent mass accumulation rate […]

Overpeck’s “Hammer”

One of the curious aspects of IPCC peer review procedure is that the ultimate authority for accepting or rejecting comments by peer reviewers rests with the IPCC authors, as opposed to the Review Editors. Review Editors are supposed to see that authors respond to Review Comments, but don’t follow up to see that it’s actually […]

“More and more concerned about our statement”

In a previous post, I reported that Coordinating Lead Author Overpeck wanted to “deal a mortal blow to the misuse of supposed warm period terms and myths in the literature”. The MWP was one such target; the Holocene Optimum was another. Overpeck said that there was “no need to go into details on any but […]

“Dealing a Mortal Blow” to the MWP

There has been a considerable amount of speculation over the past few years about which “leading” climate scientist told David Deming that we have to “get rid of” the Medieval Warm Period, including speculation (e.g. ukweatherworld) that it was Jonathan Overpeck (recently one of two Coordinating Lead Authors of AR4 chapter 6). While the identity […]

IPCC and the Law Dome Graphic

Re-reading Climategate and AR4 Review Comments, I noticed an interesting discussion about handling the Law Dome O18 record – a series used in Mann and Jones (2003) and Jones and Mann (2004) with a very elevated MWP.

Overpeck’s Enigmatic Tuq(?)

In fairness to Kaufman, he and his students actually did useful field work. Elsewhere I’ve noted that their MSc theses contain many helpful details on the Alaskan lakes. The situation is entirely different with the Greenland lakes, where Jonathan Overpeck was the point man for the ARCUS2k lake project collection. Kaufman et al 2009 contains […]

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