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Kaufman's BSi Selection
Below is a plot comparing sediment BSi (biological silica) to depth (cm) from two of Kaufman’s lakes (done by different students). I’ve shown it by depth (rather than ascribed age) since the dating of...
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Five Alaskan BSi Series
At the second meeting of Kaufman’s PIs, one of the scientists plaintively asked: But shouldn’t we aim to do a synthesis that is only lake seds (at least as first step)? This logical building block was...
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Kaufman's "Classical" Log Regression
I observed yesterday that I had been unable to replicate the archived version of Kaufman’s Hallet Lake series – something that I thought was due to a change in the archived version (since the NCDC...
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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...
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Varves: To Log or Not to Log
The majority of Kaufman’s varvochronology proxies are various functions of varve thickness – which, if anything, seem more problematic than sediment BSi. While Kaufman’s offering memorandum to NSF...
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Loso: Varve Thickness and Nearest Inlet
One excellent feature of the Alaskan varvochronologists is that (unlike, say, Bradley and his coterie) some of them show and archive their work. The Kaufman student MSc theses are good at this. So too...
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Atte Korhola: political and social playground
There is an interesting, and, in my opinion, very bold, comment (dated 9/27, here in Finnish; Google Translation) in a Finnish web journal by professor Atte Korhola entitled “Recession in Climate...
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The Kaufman Corrigendum
In a draft Corrigendum dated Oct 10, 2009 (most recently modified Oct 21, 2009), Kaufman gives what is obviously a warm and heartfelt shout-out in which they: thank those who have pointed out errors...
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Gifford Miller vs Upside-Down Kaufman
Darrell Kaufman, lead PAGES2K author, has promoted varvology for Arctic temperature reconstructions. Kaufman et al 2009 introduced varves into multiproxy reconstructions. Kaufman et al 2009 unwisely...
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More Kaufman Contamination
Kaufman and paleo peer reviewers ought to be aware that the recent portion of varve data can be contaminated by modern agriculture, as this was a contentious issue in relation to Mann et al 2008...
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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...
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New Article on Igaliku
Shortly after the publication of PAGES2K, I pointed out that the Igaliku lake sediment proxy, had been contaminated by modern agricultural runoff. The post attracted many comments. Nick Stokes...
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The Third Warmest Arctic Century
PAGES2K (2013) unequivocally stated that the Arctic was “warmest during the 20th century”: The Arctic was also warmest during the twentieth century, although warmer during 1941–1970 than 1971–2000...
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The Kaufman Tautology
The revised PAGES2K Arctic reconstruction used 56 proxies (down three from the original 59). Although McKay and Kaufman 2014 didn’t mention the elephant in the room changes in their reconstruction (as...
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Another Upside-Down PAGES2K Non-Corrigendum
Kaufman and McKay recently and quietly issued an Arctic2K correction file at NOAA xls here that concedes yet another upside-down series previously pointed out to them at Climate Audit. Once again, they...
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PAGES 2017: Arctic Lake Sediments
Arctic lake sediment series have been an important component of recent multiproxy studies. These series have been discussed on many occasions at Climate Audit (tag), mostly very critical. PAGES 2017...
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