More on the Hanno Wikipedia graph in the UN Climate Report

Guest post by Harold Ambler, TalkingAboutTheWeather.com

What started as a brouhaha in the blogosophere has turned into a minor embarrassment for the United Nations in the climate debates. As first reported on ClimateAudit.org, the origin of a graph used in last week’s UN climate report, published to coincide with the summit in New York attended by President Obama and other world leaders, was not an august team of scientists working around the clock, but rather Wikipedia.

Perhaps equally surprising was the revelation that the graph’s author was not a climatologist, but rather an obscure Norwegian ecologist, Hanno Sandvik, who claimed no expertise regarding the data used in his graph. Misidentified in the UN report as “Hanno,” Sandvik politely distanced himself from the graph as the story unfolded. The UN report authors, meanwhile, had given a scientist they had never met or heard of the appearance of scientific legitimacy.

Was copying and pasting a Wikipedia graph drawn by a non-climatologist the best that the United Nations, with a staff of hundreds working on climate change using an annual budget in the hundreds of million dollars, could do? Evidently, it was. Sandvik himself appeared surprised.

‘My’ graph has not been published in a peer-reviewed journal since I am not a climatologist,” he wrote in an e-mail to TalkingAboutTheWeather.com. “The graph has been drawn using data that have undergone peer-review. That means that the graph is ‘mine’ only in a very restricted sense, viz. that I have drawn it – the underlying data [are] not mine, as the source provided clearly indicates. I have no qualification to judge whether the underlying data are correct or erroneous, and have never pretended to be able to do so.

This is not the first graph with a hockey-stick shape to gain notoriety. The most famous example is that of Penn State climatologist Michael Mann’s own hockey stick graph, prominently featured at the 2001 UN IPCC meeting and in its Third Assessment Report.

That hockey stick has since been debunked by the United States Congress by the world-renowned statistics expert Edward Wegman. See the Wegman report here.

The Wegman Report was sufficiently damning that, until now, the United Nations has distanced itself from Mann’s graph, which did not appear in the Fourth Assessment Report published in 2007. From the Congressional report led by Wegman came the following conclusion:

“The [Mann] methodology puts undue emphasis on those proxies that do exhibit the hockey stick shape and this is the fundamental flaw.”

Mann has argued that it was never his intention for the flat part of the stick that he derived from proxies to be grafted onto the modern temperature record, providing the upturned blade, as though the two sets of data had the same origin. Writing on the website that he co-founded, realclimate.org, Mann wrote the following in response to earlier critiques of his methodology in 2004: “No researchers in this field have ever, to our knowledge, ‘grafted the thermometer record onto’ any reconstruction. It is somewhat disappointing to find this specious claim (which we usually find originating from industry-funded climate disinformation websites) appearing in this forum.”

Such a graft is precisely what Sandvik’s graph does, however, leading to the inevitable question: Is the United Nations an “industry-funded climate disinformation website”? Unlike Mann’s graph, which, with the use of color and error bars, at least suggests both the level of uncertainty associated with temperature proxies and shows that the sources for the temperature data is not the same during the past 1,000 years, the “Hanno” graph used by the United Nations has neither error bars nor different colors for the differently derived data. By intent or no, it is inherently misleading.

The storm over “Hanno 2009” is very likely just beginning.

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Harold Ambler is an avowed starving artist. His first book about climate, Don’t Sell Your Coat, is due to be published in November. In the meantime he’s living hand to mouth. If you liked this article consider helping him out by hitting his tip jar. – Anthony