Components of CO2 in 1750 through 2018 Corrected for the Perturbation of the 14CO2 Bomb Spike

Skrable, Kenneth W.; Chabot, G.E.; French, Clayton

doi:10.1097/hp.0000000000001606

Health Physics

2022

DOI: 10.1097/hp.0000000000001606

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Components of CO2 in 1750 through 2018 Corrected for the Perturbation of the 14CO2 Bomb Spike

Kenneth W. Skrable

G.E. Chabot

Clayton French

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2023

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“…We thank Dr. Andrews for his interest in our past paper and in our recent letter to the Health Physics Journal regarding our adjusted assessment of fossil fuel-derived CO 2 in the atmosphere (Skrable et al 2022). We believe that our letter to which Andrews refers and the supporting document available through the link therein provide detailed and adequate information to support our position.…”

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2023

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justed assessment of fossil fuel-derived CO 2 in the atmosphere (Skrable et al. 2022). We believe that our letter to which Andrews refers and the supporting document available through the link therein provide detailed and adequate information to support our position. We provide some additional reinforcing information here in an attempt to clarify our position and respond to Andrews' criticism with reference to items 3 and 4, which he specifies in the beginning of his letter.Andrews' claim is that the disappearance of fossil-derived CO 2 in the atmosphere is associated with the process of isotope exchange caused by molecular exchange between the atmosphere and CO 2 reservoirs, such that 14 CO 2 concentrations in the atmosphere are increased when fossil-derived CO 2 exchanges with non-fossil CO 2 . An important point to bear in mind is that our assessments are of annual average concentrations of fossil and non-fossil derived CO 2 in the atmosphere. They incorporate any consequences of isotope exchange that have occurred. Our use of the term "non-fossil CO 2 " means that such CO 2 does not contain the anthropogenic fossil component and is basically the same as what existed in the atmosphere prior to the industrial revolution. As we have described earlier, changes from initial values in 1750 of the fossil and non-fossil components are independent of each other.Annual changes are much less affected by mixing/ isotope exchange processes than are longer term assessments. If we look at annual emissions of CO 2 into the atmosphere and evaluate annual increases in our calculated atmospheric CO 2 fossil-derived concentrations, we find fossil changes are much less than what would be predicted from the annual emissions. The values we are using are those from Table 2 of our supporting document (http://links. lww.com/HP/A230). The first column in Table 1 contains the years for the chosen interval. Changes expressed in columns are from the end of the first year to the end of the second year. The second column contains our results for the See https://sos.noaa.gov/catalog/datasets/ocean-atmosphere-co2exchange/#:~:text=When%20carbon%20dioxide%20CO2,certain% 20areas%20of%20the%20ocean. Accessed

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2023

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Comments on “Components of CO2 in 1750 through 2018 Corrected for the Perturbation of the 14CO2 Bomb Spike”

Andrews

2023

Health Physics

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Comments on "Components of CO 2 in 1750 through 2018 Corrected for the Perturbation of the 14 CO 2 Bomb Spike" Dear Editors: A paper in this journal analyzing atmospheric radiocarbon specific activity by Skrable et al. (February 2022) (hereinafter "Skrable 1") attracted multiple critical letters by atmospheric scientists and others. One of those letters by Schwartz et al. (2022) made four arguments against the paper, briefly summarized here as: 1. Use of erroneous data on atmospheric CO 2 history; 2. Neglect of the "bomb carbon;" 3. Failure to account for isotope exchange between the atmosphere and other reservoirs; and 4. Neglect of other lines of evidence that fossil fuel emissions are the source of atmospheric CO 2 rise.

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Components of CO2 in 1750 through 2018 Corrected for the Perturbation of the 14CO2 Bomb Spike

Cited by 2 publications

References 3 publications

Invited Response to Andrews

Invited Response to Andrews

Comments on “Components of CO2 in 1750 through 2018 Corrected for the Perturbation of the 14CO2 Bomb Spike”

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