kaufman, Tag

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 (and related Werner...

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...

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 discussed at...

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 according...

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 vigorously opposed the surmise...

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)...

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 used the contaminated...

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 (Upside Down Mann) and Kaufman...

Over at Climate Audit, Steve McIntyre has found yet another unexplainable inclusion of a hockey stick shaped proxy in the PAGES2K paper. What is most interesting about it is that when you look at the proxy plot panel, it...