Category Archives: Mann et al 2007

Signal to Noise Ratio Estimates of Mann08 Temperature Proxy Data

Aug 19, 2010 – 9:49 AM

Guest post by Jeff Id from The Air Vent (used by invitation) Occasionally when working on one thing long enough, you discover something unexpected that allows you to take a step forward in understanding.  At the ICCC conference, I met Steve McIntyre and took time to ask him how come Mann07 “Robustness of proxy-based climate […]

By Anthony Watts | Also posted in Mann et al 2008 | Comments (18)

Pseudoproxies in Mann et al 2007

Nov 22, 2007 – 5:46 PM

Judith Curry and JEG have expressed an interest in talking about Mann et al 2007, Robustness of proxy-based climate field reconstruction methods, JGR pdf. This is successor article to Mann et al, 2005, Testing the Fidelity of Methods Used in Proxy-Based Reconstructions of Past Climate, pdf. Looking past the annoying and amusing faults, here are some […]

By Stephen McIntyre | Tagged | Comments (24)

Ross McKitrick on Mann et al 2007

Nov 22, 2007 – 11:43 AM

First, on page 15, they say: This result (as well as the separate study by Wahl and Ammann [2007]) thus refutes the previously made claim by MM05 that the features of the MBH98 reconstruction are somehow an artifact arising from the use of PC summaries to represent proxy data. Well, if we had argued that […]

By Stephen McIntyre | Comments (6)

A Georgia Tech EAS8001 Assignment

Nov 22, 2007 – 11:08 AM

Here’s an assignment for JEG’s hockey stick class. Try to replicate the reported proxy-gridcell temperature correlations reported in Mann et al 2007 SI. The table showing correlations between 112 proxies (the AD1820 network presumably) and gridcell temperature are shown in column 5 of the spreadsheet here. Data for the 112 proxies in the AD1820 proxy […]

By Stephen McIntyre | Comments (11)

Mann et al 2007 Precipitation Teleconnections

Nov 21, 2007 – 7:33 PM

Judith Curry suggested that we talk a little about Mann et al 2007 available here . I noted its publication last summer when Jean S and UC made some remarks about it. It has an extensive SI with code here and, in fairness to Mann, there is a serious attempt at documenting his work in […]

By Stephen McIntyre | Comments (108)