I really need to get back to the analysis of tax and expenditure options I’ve been working on, but the absurdities of the Oz keep distracting me. Today’s paper runs a front page story claiming “Temperatures were higher 2000 years ago“. The story is based on a study published in Global and Planetary Change, which uses tree ring records to estimate (with lots of caveats about uncertainty) that Northern Hemisphere (presumably land) temperatures were warmer in the 1st Century AD than in the 20th. More precisely, “The first century AD was the warmest 100-year period (+0.60C on average relative to the 1951-1980 mean) of the common era”. Take that, warmists!
There’s are a couple of minor problems with the story. As part of the Murdoch empire, encompassing 20th Century Fox, the Oz has apparently not noticed that the 20th century ended some years ago. And, being prone to printing silliness about pauses in warming, the writer, Graham Lloyd, did not bother to check whether the temperature today is warmer than the 1951-1980 mean. This isn’t hard to do. The US National Climatic Data Center reports global temperatures on a monthly basis. It reports that the Northern Hemisphere land temperature for September 2012 was +1.04 ± 0.26 above the 20th century average (I’ve checked and 1950-80 was about equal to the average for C20 as a whole).
So, the correct headline for the story should have been “Northern Hemisphere warmer than at any time in past 2000 years”
One more point, just for completeness. Readers might reasonably assume that the graphic accompanying the story is taken from the journal article it reports. In fact, it’s credited to the Global Warming Policy Foundation – given the fact that the Oz has linked to it, you don’t need to be Einstein to guess what kind of policies the scientific ex this foundation (headed by Benny Peiser) is pushing.
Update Reader andrewt points us to the actual article. The GWPF graphic is taken from the article, with the addition of a bunch of chartjunk. The article actually focuses on Northern Scandinavia, though its results are broadly consistent with other reconstructions at the hemispheric and global scale. And, while I won’t bother linking, it’s clear that Lloyd has taken his story, and interpretation of the results, from the Anthony Watts “sceptic” site.