Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Atmospheric CO2: A Finite Reservoir Model Reproduces 14C / 13C over Two Centuries and Indicates the Fossil-Fuel Anthropogenic Contribution

Version 1 : Received: 11 May 2022 / Approved: 12 May 2022 / Online: 12 May 2022 (14:24:08 CEST)

How to cite: Taylor, S. Atmospheric CO2: A Finite Reservoir Model Reproduces 14C / 13C over Two Centuries and Indicates the Fossil-Fuel Anthropogenic Contribution. Preprints 2022, 2022050172 (doi: 10.20944/preprints202205.0172.v1). Taylor, S. Atmospheric CO2: A Finite Reservoir Model Reproduces 14C / 13C over Two Centuries and Indicates the Fossil-Fuel Anthropogenic Contribution. Preprints 2022, 2022050172 (doi: 10.20944/preprints202205.0172.v1).

Abstract

Whereas many carbon cycle models track CO2 perturbations relative to a pre-industrial equilibrium, this paper uses absolute quantities to describe atmospheric CO2 sinks, source and flow rates. This method, when combined with the notion of source and sink resistance, and a finite biospheric reservoir, accurately describes 14C levels between 1820 and 2020 using only five external parameters. The inputs are:- global records of fossil-fuel emissions, records of CO2 mixing-ratio and listings of atmospheric atomic weapons tests. Over the same period 13C flows are also accurately described given a ð13C value for fossil fuel and a ð13C value for the initial background. This top-down approach differs from complex climate models since it circumvents the necessity to catalogue individual processes. The paper proceeds to use the method to examine the anthropogenic fossil-fuel emissions contributions during the period 1750 to 2020, deducing that around 24% remains in the atmosphere, while 76% has been absorbed in the land, terrestrial biosphere and surface ocean. During the same period 13% of the total CO2 atmospheric concentration is due to fossil fuels. However, regarding the increase, fossil fuels contributed to 38% of the rise during this period.

Supplementary and Associated Material

https://www.geomatix.net/download.htm: CFR model as Excel spreadsheet.

Keywords

CO2 residence-time; CO2 lifetime; carbon cycle; CO2 atmospheric flux; anthropogenic emissions; global warming; climate change

Subject

EARTH SCIENCES, Atmospheric Science

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