Friday, December 11, 2009

Another ClimateGate at Darwin Zero?

I am quoting rather liberally from but you should head over because there is much more including a lot of comments. Boiling this latest piece of controversy down to the simplest point, the issue here is temperature adjustments. For various reasons, the raw temperature data gathered may need to be adjusted to compensate for some variable to allow it to be used with other data. The adjustment here though is rather extreme and seemingly totally unjustified.

"I always like to start with the rawest data, so I can understand the adjustments. At Darwin there are five separate individual station records that are combined to make up the final Darwin record. These are the individual records of stations in the area, which are numbered from zero to four:


Figure 5. Five individual temperature records for Darwin, plus station count (green line). This raw data is downloaded from GISS, but GISS use the GHCN raw data as the starting point for their analysis.
To my great surprise, here’s what I found. To explain the full effect, I am showing this with both datasets starting at the same point (rather than ending at the same point as they are often shown).

Figure 7. GHCN homogeneity adjustments to Darwin Airport combined record

YIKES! Before getting homogenized, temperatures in Darwin were falling at 0.7 Celcius per century … but after the homogenization, they were warming at 1.2 Celcius per century. And the adjustment that they made was over two degrees per century … when those guys “adjust”, they don’t mess around. And the adjustment is an odd shape, with the adjustment first going stepwise, then climbing roughly to stop at 2.4C.
Intrigued by the curious shape of the average of the homogenized Darwin records, I then went to see how they had homogenized each of the individual station records. What made up that strange average shown in Fig. 7? I started at zero with the earliest record. Here is Station Zero at Darwin, showing the raw and the homogenized versions.

Figure 8 Darwin Zero Homogeneity Adjustments. Black line shows amount and timing of adjustments.

Yikes again, double yikes! What on earth justifies that adjustment? How can they do that? We have five different records covering Darwin from 1941 on. They all agree almost exactly. Why adjust them at all? They’ve just added a huge artificial totally imaginary trend to the last half of the raw data! Now it looks like the IPCC diagram in Figure 1, all right … but a six degree per century trend? And in the shape of a regular stepped pyramid climbing to heaven? What’s up with that?"

Past related posts:
Berman Post: Leaked/Hacked Emails Suggest Global Warming Fraud Among Top Scientists
Berman Post: Hide The Decline
Berman Post: PJTV on 'ClimateGate'
Berman Post: A New Zealand 'ClimateGate'?
Berman Post: John Holdren (Obama Science Czar) Is Directly Involved With 'ClimateGate'?
Berman Post: 'ClimateGate' or 'ClimaQuiddick'
Berman Post: Original CRU Data Has Been Destroyed
Berman Post: Scientists at Center of 'ClimateGate'/'ClimaQuiddick' Agree to Turn Over All Raw Data ... Sort of
Berman Post: Gibbs on 'ClimateGate'/'ClimaQuiddick' ... 'No Dispute on Climate Chage'
Berman Post: Phil Jones Steps Down Over 'ClimateGate'/'ClimaQuiddick'
Berman Post: Jon Stewart Goofs on 'ClimateGate'/'ClimaQuiddick' Scientists
Berman Post: Silicon Graffiti - Hide The Decline!
Berman Post: UN to Investigate 'ClimateGate'/'ClimaQuiddick'
Berman Post: Dilbert on The Made up Global Warming Numbers, Sort of
Berman Post: Leaked/Hacked 'ClimateGate' Emails Traced to Russia
Berman Post: Understanding "Hide The Decline"
Berman Post: More on Understanding "Hide The Decline"
Berman Post: A NASA ClimateGate?

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