Influence of the Southern Oscillation on tropospheric temperature

A potential AGW buster, attributing decadal temperature variation largely to internal oceanic effects, ENSO and over the longer term the 1976 Great Pacific Climate Shift, as we did here, is a new paper by Australian John McLean, with New Zealander Chris de Freitas, and Australian ex-pat Kiwi Bob Carter.

That mean global tropospheric temperature has for the last 50 years fallen and risen in close accord with the SOI of 5–7 months earlier shows the potential of natural forcing mechanisms to account for most of the temperature variation.

While the bottom line of this paper is that the change in SOI accounts for 72% of the variance in global temperature for the 29-year-long MSU record and 68% of the variance in global temperature for the longer 50-year RATPAC record, I think the claim of a longer term temperature effect could have been better supported. They stated:

Lean and Rind [2008] stated that anthropogenic warming is more pronounced between 45°S and 50°N and that no natural process can account for the overall warming trend in global surface temperature. We have shown here that ENSO and the 1976 Great Pacific Climate Shift can account for a large part of the overall warming and the temperature variation in tropical regions.


However, the assertion comes down to Figure 4 where they identify that the mean of the SOI (and temperature) seems to change at 1976. This model is not identified rigorously with any analysis, but is stated as an observation in the text.

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Discredited AGW Scorecard

A new page in the “abouts” section lists my non-self-published contributions to discrediting AGW since my transmogrification in 2004 to a skeptic remarkably similar to the one described by LuboÅ¡ Motl in his review of Ralph Alexander’s new book.

Just like a majority of books on the subject, Dr Alexander makes the readers understand that the global warming alarm is almost completely an artifact of manipulation with the human psychology and with the data. But unlike the case of many other books, you will see that Dr Alexander is actually a mainstream scientist (and an applied scientist in the environmental sector) who cares about the good name and functioning of science. Years ago, he was inclined to believe the “general wisdom” about the problem. His diametrically opposite conclusions are a result of his long research of the problem. And his pride of a scientist has been hurt. Climatology has become an ugly example of a scientific discipline that has largely ceased to be scientific.

Also listed are vindications of my POV — bound to provoke some discussion.

If you can't take the heat …

The Hon Wilson “Ironbar” Tuckey MP on the ETS. Worth a read. ETS doesn’t have the numbers in the Senate — via Crikey.

Sent: Tue Jul 21 12:58:50 2009
Subject: Emissions Trading Scheme – Confidential

The issue of the arrogance and inexperience of our Leader on the issue of the Emission Trading Scheme has to be addressed.

As a simple example of the negative politics of an ETS has anyone asked why Labor now titles it’s legislation the ‘Carbon Pollution Reduction Scheme’.

As this note goes to all Members I insist that those who support the ETS should write me a detailed response as to how a Government process of selling certificates to pollute will guarantee that Australia will automatically reduce its emissions. One as versed in business as our Leader knows full well that judgements will be made on the commercial basis of “can I pass this cost onto a captive market” or “should I run down my existing investment and leave town” for greener pastures such as China, where Government investment is going to achieve the emissions reductions for me, or the USA where the science could be disproved* before their Claytons ETS is implemented and that’s assuming it can pass the Senate, considering 44 Democrats in the House of Representatives voted against even this Claytons Bill.

Just in case you didn’t know or don’t care, the total vote in the Congress was 431 with the numbers being 219 for and 212 against, so the Bill only passed by 7 votes with 44 Democrats crossing the floor. If the same pattern of voting is followed in the Senate, where the Bill needs 60 votes to advance, and the Democrats have 58 votes, the Bill will be defeated or further diluted.

Another myth is the proposed massive job creation arising from a Derivates Trading Scheme not a Renewable Energy Scheme*. What is more every Green Energy job that cannot reduce the cost of energy is just a further burden to the economy.

There are no amendments to the ETS that will make it work. By its nature, it is either a simple job destroyer or must be so generous as to fail in its purpose.

I can think of no better issue upon which to fight an election be it early or on time.

All that is needed is to differentiate the ETS from the Climate Change response.

I talk to many people and get stopped in the street and in the airport by people who recognise me. Not one has directly raised Climate Change nor do they do so when they are asked to independently list the areas of their concern.

An ETS is a job destroyer and they are worried about that, hence the ACTU 1 million jobs campaign which even Sharryn Burrows can’t make sound convincing.


Swanson's PC Projection

Swanson’s projection for future temperature using presumed regime shifts can be compared with our projection.


The above figure was posted at RealClimate (note this figure is not contained in their paper) with flat temperature intersecting with an extrapolated underlying rate of around 1C/Century seen between 1950 and 1998 at around 2020.


Our projection for temperature, from figure 3 of our paper archived at arXiv and submitted to IJF, Structural break models of climatic regime-shifts: claims and forecasts is based on the current flat rate intersecting with an extrapolated underlying rate of around 0.5C/Century between 1910 and 1976, at around 2050.

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Smooth Operator

The replication of the highly influential Rahmstorf 2007 A Semi-Empirical Approach to Sea Level Rise, one of the main sources of projected sea level rise, was reported in the previous post.

In a now discredited (and disowned) Rahmstorf et al 2007 publication, Steve McIntyre showed that Rahmstorf had pulled an elaborate stunt on the community by dressing up a simple triangular filter with “singular spectrum analysis” with “embedding dimensions”, I can now report another, perhaps even more spectacular stunt.

His Figure 2 is crucial, as it is where the correlation between the rate of sea level increase, deltaSL, and the global temperature, Temp, is established. If these were not correlated, then there would be no basis for his claims of a significant “acceleration” in the increase in sea level when temperature increases, and his estimates of sea level rise by 2100 would not be nearly so high.

It is well known that smoothing introduces spurious autocorrelations into data that can artificially inflate correlations, and one of the comments on his paper (attached to the first link above) picked up on this. Rahmstorf’s procedure introduces no less than 5 different types of smoothing to produce his Figure 2:

1. singular spectrum analysis – the first EOF
2. he then pads the end of the series with a linear extrapolation of 15 points
3. convolution, (or 15 point filtering)
4. calculates the linear trend from 15 points (on the sea level data only)
5. binning of size 5

I replicated his procedure in the previous post in the series. Here, the entire procedure is substituted with a single binning (averaging each successive M data points). The figure below compares the Rahmstorf procedure at parameters m=13:16 (red line), and the result of binning the same data into bins of size m=13:16 (black line). The sea level data is differenced after binning to get a delta SL.


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