Comment on “The phase relation between atmospheric carbon dioxide and global temperature” Humlum et al. [Glob. Planet. Change 100: 51–69.]: Isotopes ignored

Kern, Zoltán; Leuenberger, Markus (2013). Comment on “The phase relation between atmospheric carbon dioxide and global temperature” Humlum et al. [Glob. Planet. Change 100: 51–69.]: Isotopes ignored. Global and planetary change, 109, pp. 1-2. Elsevier Science 10.1016/j.gloplacha.2013.07.002

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A recent study relying purely on statistical analysis of relatively short time series suggested substantial re-thinking of the traditional view about causality explaining the detected rising trend of atmospheric CO2 (atmCO2) concentrations. If these results are well-justified then they should surely compel a fundamental scientific shift in paradigms regarding both atmospheric greenhouse warming mechanism and global carbon cycle. However, the presented work suffers from serious logical deficiencies such as, 1) what could be the sink for fossil fuel CO2 emissions, if neither the atmosphere nor the ocean – as suggested by the authors – plays a role? 2) What is the alternative explanation for ocean acidification if the ocean is a net source of CO2 to the atmosphere? Probably the most provocative point of the commented study is that anthropogenic emissions have little influence on atmCO2 concentrations. The authors have obviously ignored the reconstructed and directly measured carbon isotopic trends of atmCO2 (both δ13C, and radiocarbon dilution) and the declining O2/N2 ratio, although these parameters provide solid evidence that fossil fuel combustion is the major source of atmCO2 increase throughout the Industrial Era.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Leuenberger, Markus

Subjects:

500 Science > 530 Physics
500 Science > 550 Earth sciences & geology

ISSN:

0921-8181

Publisher:

Elsevier Science

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

25 Sep 2014 13:01

Last Modified:

19 Oct 2015 09:37

Publisher DOI:

10.1016/j.gloplacha.2013.07.002

BORIS DOI:

10.7892/boris.49628

URI:

https://boris.unibe.ch/id/eprint/49628

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