I have been spending some time (my wife would say “too much time”) examining how the Hansen Bias Method influences the temperature record. We have already observed that the Hansen method introduces an error in cases where the different versions are merely scribal variations. See http://www.climateaudit.org/?p=2019 and discussion. The cause of the error has also […]
The section of Hansen’s code that we’d been looking at immediately prior to the dump of relatively unannotated code was how Hansen combined scribal versions of different stations in a 2-column case – which looks to contain a material error already discussed without the benefit of source code and which is going to be examined […]
Hansen has just released what is said to be the source code for their temperature analysis. The release was announced in a shall-we-say ungracious email to his email distribution list and a link is now present at the NASA webpage. Hansen says resentfully that they would have liked a “week or two” to make a […]
We have some firm sightings of Waldo in Siberia, as Warwick Hughes has long told us. There are very remarkable differences between temperature series depending on the site in Siberia. When Gavin Schmidt or James Hansen encounter differences of this order of magnitude between the U.S. and the ROW, they ascribe it to “regional” climate […]
We’ve been discussing the bewildering methods that Hansen used to do what appears to be a trivial task: combining slightly variant versions of GHCN data at an individual station – versions, that in many cases are identical for many of their readings. As it turns out, GHCN has a manual on their data set, including […]
Let’s move from the 2 column case to the 3 column case (e.g. Bagdarin, already considered) applying the results here. Some of the hypotheses from the earlier discussion have to be re-visited. Bagdarin has 3 dset=0 versions (0,1,2). As we’ve seen in the 2-column case, the column that continues to the present (version 2) exactly […]
The question today is: how does Hansen calculate quarterly and annual averages when there are missing values? It’s not obvious. The issue arose in the previous puzzle in trying to calculate Hansen’s adjustment prior to combining scribal versions. Essentially what happens as reported in the prior post is that when there is a missing value, […]
For your Sunday edification, today’s crossword puzzle pulls together 3 examples of Hansen data “combining”. The question is to find an AlGore-ithm that accounts for all three versions. The three data sets each have 3 columns: the first two are data versions; the third column is Hansen-combined. In each case, there is an overlap between […]
I’ve got an idea of how Hansen sliced the salami in Praha-Libus, an enterprise no doubt dear to Lubo” heart or, at least, stomach. There are only 2 series in play. Version 61111520000-0 goes from 1971 to 1991 and version 61111520000 – 1 goes from 1986 to 2007. For all values where there is only […]
John Goetz sent me some scanned excerpts from Hansen and Lebedeff 1987 which (only somewhat) clarify what Hansen’s doing – although the descriptions below do not clarify the Kalakan problem of how the combined station record becomes colder than any of the measurements in the period. There are somewhat different issues in combining records which […]
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