Thongchai Thailand

Mathematical Impossibility of Stuiver and Quay

Posted on: February 10, 2019

 

FIGURE 1: STUIVER & QUAY TREE RING DATAstuiverQuay

 

FIGURE 2: FOSSIL FUEL EMISSIONS

stuiverquay-emissions

 

FIGURE 3: WELLINGTON DATA: BOMB SPIKE AND ITS DECAYbombSpike

 

FIGURE 4: POST WELLINGTON 14C DATAstations

 

FIGURE 5: COMPARISON OF EXPONENTIAL DECAY

 

FIGURE 6: SUMMARY OF DECAY CURVE COMPARISON

SUMMARY

 

 

 

 

[LIST OF POSTS ON THIS SITE]

 

  1. The theory of Anthropogenic Global Warming (AGW) and climate change holds that the warming seen in this interglacial period since Pre-Industrial Times that got us out of the Little Ice Age (LIA) is caused by fossil fuel emissions from the Industrial Economy and that it is warming at such a dangerous rate that its effects may destroy human civilization and that this assessment implies that we must take urgent climate action in the form of sharp reductions in, or the complete elimination of, the use of fossil fuels. The relationship between fossil fuel emissions and global warming is presented as a two-step process. First, emissions cause atmospheric CO2 to rise and second, the higher level of CO2 concentration of the atmosphere causes surface temperature to rise in accordance with a proposed greenhouse gas (GHG) effect of CO2. A test of the first relationship, that between emissions and atmospheric composition is presented in a related post [LINK] where it is shown that no evidence for this relationship is found in the data for emissions and atmospheric CO2 concentration. However, an additional argument for this relationship is presented by climate science in terms of the observed dilution of the carbon-14 (hereafter 14C) isotope fraction of carbon in atmospheric CO2. It is claimed that this dilution proves that fossil fuel emissions accumulate in the atmosphere because fossil fuel carbon is known to contain low or no 14C having been dead and underground for millions of years. This post is a test of the 14C dilution hypothesis. The full text of the source document may be found here [LINK]
  2. Carbon-14 forms naturally in the atmosphere by the action of cosmic rays on nitrogen but it is radioactive and so, once formed, 14C decays exponentially with a half-life of about 5,700 years. Radioactive decay is balanced by new cosmogenic synthesis and at equilibrium roughly one part per trillion of atmospheric carbon dioxide is made with radiocarbon. All carbon life-forms contain the prevailing equilibrium ratio of atmospheric 14C as long as they are alive and their bodily carbon is being replenished. When they die, however, the radiocarbon fraction in their body begins an exponential decay. The relevance of these relationships in climate science derives from the idea that fossil fuels are dead remains of living things that has been dead for millions of years and that therefore all their 14C has decayed leaving them 14C-free. It is thus postulated that the release of fossil fuel emissions into the atmosphere reduces the radiocarbon portion of atmospheric carbon dioxide and that therefore the degree of such radiocarbon dilution serves as a measure of the contribution of fossil fuel emissions to the observed increase in atmospheric carbon dioxide (Stuiver, 1981) (Suess, 1953) (Revelle, 1957) (Tans, 1979).
  3. The Stuiver and Quay paper (Stuiver, 1981) presents carbon-14 measurements in tree rings of two Douglas Firs in the Pacific Northwest that grew from 1815 to 1975. The now famous graphic representation of these data taken from their paper is shown in Figure 1 above. The figure shows a fairly steady 14C ratio from 1820 to 1900 with perhaps a gradual decline of about 5% and then a steep decline of about 20% from 1900 to 1950 in sync with the generally agreed separation of pre-industrial times from the post industrial fossil fueled economy which is thought to have taken off sometime between 1850 and 1900. These data are therefore generally accepted as empirical evidence that the observed increase in atmospheric CO2 since pre-industrial times is derived from fossil fuel emissions (IPCC, 2007) (IPCC, 2014) by way of the dilution of atmospheric 14C with pure 12C carbon from fossil fuels. The value of these pre-bomb data is that almost immediately following the end of their sample period in 1950, atmospheric tests of nuclear weapons sharply increased the 14C ratio in atmospheric carbon dioxide and following the cessation of such tests after the nuclear test ban treaty the 14C ratio began a natural exponential decay thereby confounding the pure fossil fuel dilution effect.
  4. The Stuiver and Quay tree ring data imply that from 1900 to 1950, fossil fuel emissions, being free of radiocarbon, caused the radiocarbon portion of atmospheric CO2 to decline by 20%. Fossil fuel emissions during this period are shown in Figure 2. A total of 50 gigatons of carbon (GTC) or about 180 gigatons of CO2 were released into the atmosphere during this period. At the same time atmospheric CO2 concentration rose 15.6 ppm or 5.38% from 296 ppm to 311 ppm. The increase of 15.6 ppm is equivalent to 33 GTC or 120 gigatons of CO2. Even if all of the emissions had gone into increasing atmospheric CO2 concentration, the dilution of 14C could not have been more than 8%. The dilution of 20% claimed by Stuiver and Quay is an impossibility in this context.
  5. These results imply that the Stuiver and Quay data do not have a simple interpretation in terms of dilution of atmospheric CO2 with fossil fuel emissions and therefore do not provide evidence that rising atmospheric CO2 concentration can be explained in terms of fossil fuel emissions.
  6. The sudden rise in atmospheric 14C due to nuclear bomb testing (the so called “bomb spike”) and its eventual decay after the nuclear test ban treaty are shown in  Figure 3. These data from 1955 to 1993 are available from the Wellington, New Zealand measuring station and they  show a rapid increase in the 14C fraction of atmospheric CO2 during nuclear testing and exponential decay after the nuclear test ban treaty . The bomb intervention confounds the fossil fuel effect in the decay data in the post bomb period. However, there is an important difference in the behavior of the decay and dilution effects because the decay of bomb 14C is exponential while the dilution by fossil fuel 12C is linear. The rate of exponential decay of bomb 14C slows with time and rate of the linear fossil fuel intervention increases with time as the rate of fossil fuel emissions rises. We therefore postulate that the linear effect of fossil fuel emissions will change the computed exponential decay equation in later periods when compared with earlier periods as fossil fuel emissions rise.
  7. Accordingly we set up a an empirical test by comparing the equation of exponential decay in the Wellington data with later measurements from various stations around the world shown in Figure 4. The post bomb spike portion of the Wellington data (Figure 3) runs from 1965 to 1993. The data show a close agreement with the exponential decay model. We can now test whether the later data for brief periods up to and including the year 2007 (Figure 4) can be explained as an extension of the same exponential decay curve. We do that by appending the data for each of the seven stations to the Wellington curve. The exponential decay curve parameters are displayed in Figure 5 and summarized in Figure 6. No significant change is found in the model parameters (Figure 6) upon appending the later brief datasets (Figure 5). The data do not provide convincing evidence that the recent datasets are not simply extensions of the Wellington curve and therefore we find no evidence that the decline in radiocarbon in atmospheric CO2 contain properties inserted by fossil fuel dilution and not explained by the natural exponential decay of bomb 14C.

 

REFERENCES

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[LIST OF POSTS ON THIS SITE]

 

2 Responses to "Mathematical Impossibility of Stuiver and Quay"

The more tests you make the more clear it becomes that human emissions of CO2 are not causing global warming. I applaud your ingenuity and dedication to finding and exposing this analysis. It has been very helpful to me coming to a clear understanding of this controversy. I am now faced with the dilemma of how to communicate it to those around me and use it to move towards realism in our political discourse. I have been disallowed to point it out in our local paper, accused of listening to crackpots instead of real scientists, and written off as impossible to teach. Interestingly though most of the folks I know have some innate distrust of the global warming message without searching for the proof. My concern is this headlong rush I see coming from the newly empowered democrats to push their agendas to the detriment of so many without any concern for efficacy of their actions to “fight climate change”.

Really great comment. It identifies the heart of the issue and that is that the alarmists have won the propaganda war.

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