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.

mclean

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.

HON WILSON TUCKEY

Swanson's PC Projection

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

rc_fig1_thumb

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.

article-003

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.

fig441

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Swanson and Tsonis 2009 on Regime-shifts

RealClimate was so concerned with our paper Structural break models of climatic regime-shifts that they felt compelled to post a paper by Swanson and Tsonis in response ;-), see Warming, interrupted: Much ado about natural variability.

There are a number of similarities and differences. Firstly, ST09 uses a very different method, fitting periodic fluctuations in ocean temperature to spatially distributed data. Regime-shifts are recognized with a measure of coherence between areas, and their theory is that shifts are more likely when synchronized. With this approach, they arrive at major shifts in 1976 as we do, and in 2002, after the big 1998 El Nino.

Using a simple Chow test for structural breaks, we get a break in 1978 and also in 1997, just before the big El Nino. These dates are within bounds of error, and differences in the method, so one might as well say they are consistent.

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Renewable Energy Uneconomic and Ecologically Dangerous

Renewable energy is a nice idea, but Peter Lang crunches the numbers and finds solar and wind power are crushingly expensive, do little for greenhouse gas reduction, and are ecologically dangerous. Cap and trade is actually a giant scheme to tax and redistribute, for the benefit of political insiders.

A letter submitted by Peter Lang argues that the numbers prove nuclear power is the only way.

Solar realities: Solar power is uneconomic. The capital cost of solar power would be 25 times more than nuclear power to provide for demand. The minimum power output, not peak or average, is the main factor governing solar power’s economic viability. The least cost solar option would emit 20 times more CO2 (over the full life cycle) and use at least 400 times more land area compared with nuclear Government mandates and subsidies hide the true cost of renewable energy.

Wind realities: Wind power does not avoid significant amounts of greenhouse gas emissions. Wind power is very high cost way to avoid greenhouse gas emissions. Wind power, even with high capacity penetration, can not make a significant contribution to reducing greenhouse gas emissions.

Nuclear power is the least-cost, low-emission electricity generation technology that can provide the large amounts of electricity needed to power modern economies.

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A semi-empirical approach to sea level rise

Published in Science, this Rahmstorf 2007 article provides a high-end estimate of sea level rise of over a meter by the end of the century (rate of 10mm/yr). Linear extrapolation puts the rate of increase at only 1.4mm and 1.7mm per year depending on start date (1860 or 1950).

The paper was followed by two critical comments, both bashing the statistics, and these are attached to the link above. Rahmstorf replied to those comments. The issues raised are familiar to readers of this, CA, Lucia, and other statistical blogs: significance, autocorrelation, etc. and worth a read.

Worthwhile as the comments are, they do not look into the problem of the end-treatment used by Rahmstorf, and I look at that here.

All of the papers projecting these high end rates, and they all depend on the assumption of recent ‘acceleration’ in sea levels. That is, seem to depend on the rate of increase getting faster and faster.

Rahmstorf 2007 paper uses the smoothing method most recently savaged at CA here, where it was shown despite all the high-falutin’ language to be equivalent to a simple triangular filter of length 2M, padded with M points of slope equal to the last M points. My main concern is that at this crucial end-section, the data has been duplicated by the padding, effectively increasing the number of data points of very high slope.

The figure below shows a replication of the Rahmstorf smoothing with and without padding (moved down for clarity) (code below). Two sea level data sets are shown, one by Church “A 20th century acceleration in global sea level rise” (used in Rahmstorf, data available from CSIRO here) another by Jevrejeva “Recent global sea level acceleration started over 200 years ago?” (data here)

It should be noted this data ends in 2001-2, a truncation bound to maximize recent temperature increases.

fig1

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