Category Archives: ar5

The IPCC Southern Hemisphere Reconstructions

A question for readers: which of the following proxies are used to reconstruct past Southern Hemisphere temperature in the IPCC’s graphic (Figure 5.7b) showing SH reconstructions: 1. Graybill’s California strip-bark bristlecone chronologies 2. upside down and contaminated Finnish lake sediments 3. European instrumental temperature data 4. Antarctic ice core d18O isotope data covering the medieval […]

Fixing the Facts 2

AR5 Second Order Draft (SOD) Figures 1.4 and 1.5 showed the discrepancy between observations and projections from previous assessment reports. SOD Figure 1.5 (see below as annotated) directly showed the discrepancy for AR4 without additional clutter from earlier assessment reports. Even though AR4 was the most recent and most relevant assessment report, SOD Figure 1.5 […]

Marotzke’s Broken Promise

A few days ago, Jochem Marotzke, an IPCC Coordinating Lead Author and, according to Der Spiegel, “president of the German Climate Consortium and Germany’s top scientific representative in Stockholm”, was praised (e.g. Judy Curry here) for his promise that the IPCC would address the global warming hiatus “head on” despite pressures from green factions in […]

Two Minutes to Midnight

There is much in the news about how IPCC will handle the growing discrepancy between models and observations – long an issue at skeptic blogs. According to BBC News, a Dutch participant says that “governments are demanding a clear explanation” of the discrepancy. On the other hand, Der Spiegel reports: German ministries insist that it […]

IPCC and the end of summer

Though I haven’t posted for a while, I’ve done quite a bit of work on climate recently, though it hasn’t been the sort of work that lends itself readily to blog posts. I made a presentation at a workshop session in Erice in the third week of August, which, at Chris Essex’ request, was entitled […]

IPCC Check Kites Gergis

A few days ago, WUWT pointed out that the American Meteorological Society webpage showed that the Gergis et al paper had been officially “withdrawn”. However, readers should know better than to presume that this would have any effect on IPCC use of the reconstruction. The withdrawal of the Gergis article hasn’t had the slightest impact […]

IPCC Rejects Anonymous Review

Although the IPCC calendar webpage doesn’t link to session documents of the 34th session (Kampala Nov 2011), David Holland has alertly located the documents – see here. IPCC rejected a proposal for anonymous peer review – see document here (page 12 on). We haven’t discussed this topic previously (in an IPCC context). On reflection, the […]

Watch the Pea – AR5 (ZOD) Chapter 10

As CA readers are aware, key findings of Santer et al 2008 do not hold using updated data. Ross and I submitted a comment to IJC showing this. The comment was rejected twice, with one of the reviewers (as in the case of the comment on Steig et al) being a Santer coauthor (who was […]

AR5 Loves Steig et al 2009

Jeff Id has an excellent post on IPCC AR5 use of the highly flawed Steig et al 2009. Despite Steig’s efforts to block the publication of O’Donnell et al 2010, O2010 shows clearly that whatever is new in Steig et al 2009 is not only incorrect, but an artifact of flawed math and whatever is […]


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