This is not a topic that I follow, but I was intrigued by some comments in a poster by Penner and Andronova, both leaders in their field, and spent some time at this poster. The abstract stated: A transient change in the balance between the incoming and outgoing radiation is an important indicator of the […]
Eduardo Zorita sent me an interesting paper today from Kiehl, a prominent climate modeler, analyzes the paradox of how GCMs with very different climate sensitivities nonetheless all more or less agree in their simulations of 20th century climate. Kiehl found that the high sensitivity models had low aerosol forcing history and vice versa. Kiehl observed: […]
Francois O writes in: For those interested in the role of the Sun on the climate, and how reconstructions can be used to assess it, there is an interesting paper just out in JGR by Nicola Scafetta and B J West. The paper is available here. This is a continuation of their previous work. Basically […]
Continuation of Exponential Growth # 2.
John V has posted some graphics recently arguing that CRN1-2 yielded pretty much the same results as major temperature indices and, in some sense, vindicated these results. As Gavin Schmidt has pointed out, the U.S. is only 2% of the world’s surface; and as I’ve observed on many occasions, the statistical methodologies and data quality […]
The source code for Hansen’s Step 2- the “urban adjustment” step is online. If anyone’s been able to operate the program through to Step 2, I’d be interested in some stage results for the stations discussed here. The verbal description is not clear and the code is a blizzard of old-fashioned Fortran subscripts, so it […]
Tamino’s guest post at RC deals with global mean temperature and AR(1) processes. AR(1) is actually mentioned very often in climate science literature, see for example its use in the Mann corpus (refs (1,2,3,4). Almost as often something goes wrong (5,6,7). But this time we have something very special, as Tamino agrees at realclimate that […]
Hansen “Step 1” which was the source of the August crossword puzzles does not occur in a crossword puzzle form in the USHCN stations that we’ve been discussing this week. The “Hansen bias” in combining scribal versions, noticed by John Goetz, does not occur in USHCN stations for two separate reasons: (1) in the USHCN […]
In the “good old days” (August 25, 2007: after they had corrected their Y2K error), I downloaded Hansen’s “combined” version (his dset=1). Jerry Brennan observed today that Hansen appeared to have already “moved on”, noticing apparent changes in Detroit Lakes and a couple of other sites. Here is a comparison of the Detroit Lakes (combined) […]
In my opinion, one of the main purpose of compiling the Hansen code is to produce intermediate versions to determine what Hansen really did. Today I’m going to compare the Step 0 version of Detroit Lakes MN (familiar to many readers from the Y2K error) as produced from running Hansen’s code with a current USHCN […]
Climate Audit 