Search Results for: homogenization

Station Homogenization as a Statistical Procedure

Temperature stations are known to be affected by numerous forms of inhomogeneity. Allowing for such inhomogeneities is an interesting and not very easy statistical problem. Climate scientists have developed some homemade methods to adjust for such homogeneities, with Menne’s changepoint-based algorithm introduced a few years ago in connection with USHCN among the most prominent. Although […]

Lampasas in BEST

A couple of years ago, Anthony observed a gross discontinuity at Lampasas TX arising from a change in station location. Let’s see how the Berkeley algorithm deals with this gross discontinuity.

Detroit Lakes in BEST

In the 2007 analysis of the GISS dataset, Detroit Lakes was used as a test case. (See prior posts on this station here). I’ve revisited it in the BEST data set, comparing it to the older USHCN data that I have on hand from a few years ago. First, here is a simple plot of […]

Demetris Koutsoyannis at 11th Statistical Climatology Meeting

Demetris Koutsoyannis was at two sessions of the 11th Meeting on Statistical Climatology in Edinburgh last week.

Climategatekeeping: Siberia

Siberian temperatures are an interesting case study in CRU gatekeeping. As reported a few days ago here, in an email of Mar 31, 2004, Jones advised Climategate correspondent Michael Mann that he had “gone to town” in his rejection reviews of submissions criticizing CRU’s handling of Siberian temperatures. Today, in a Climate Audit exclusive, we […]

Esper et al 2009 on West Siberia

Esper et al (Global Change Biology, in press) “Trends and uncertainties in Siberian indicators of 20th century warming” is relevant to our present consideration of Briffa’s Yamal, which I will get to shortly. The cutline in their abstract declares in effect that the divergence problem is not as “bad as we thought”: Despite these large […]

Gavin's Guru and RCS Standardization

Obviously, there has been considerable controversy over the past few days over the Yamal data. First, let’s observe the continued silence of field dendros on the dispute. None have stepped forward so far to support Briffa’s use of 10 cores in 1990 (and 5 in 1995). As others have observed, their silence is rapidly becoming […]

Adjusting Pristine Data

On September 15, 2008, Anthony DePalma of the New York Times wrote an article about the Mohonk Lakes USHCN weather station titled Weather History Offers Insight Into Global Warming. This article claimed, in part, that the average annual temperature has risen 2.7 degrees in 112 years at this station. What struck me about the article […]

Cedarville Sausage

In May I began a quest to better understand how GISS does its homogeneity adjustment, also known as GISS Step 2. Steve McIntyre took the ball from that scrum and ran with it, producing a set of R tools that nearly replicate the GISS method. Some of the endpoint cases continue to confound those of […]

What a great USHCN station looks like: Tucumcari

I’ve spent a lot of time on this blog showing how badly maintained and situated the stations in the USHCN network are. And rightly so, the majority of them have issues. But, finding the good ones is actually more important, because they are the ones that hold the true unpolluted temperature signal. Unfortunately, the “good […]