Ocean Science
Ocean Science
OS
Articles | Volume 20, issue 5
Articles | Volume 20, issue 5
https://doi.org/10.5194/os-20-1325-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-20-1325-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 20, issue 5
Research article
 | 
28 Oct 2024
Research article |  | 28 Oct 2024

Temperature effect on seawater fCO2 revisited: theoretical basis, uncertainty analysis and implications for parameterising carbonic acid equilibrium constants

Matthew P. Humphreys

Supplement

https://doi.org/10.5194/os-20-1325-2024-supplement

Data sets

Comparison of discrete and underway carbon dioxide (CO2) related measurements obtained during 21 cruises spanning the Pacific, Atlantic, Indian Oceans and Gulf of Mexico between 1991 and 2020: inferences on the temperature dependence of the fugacity of CO2 (fCO2) in seawater (NCEI Accession 0247018) Rik Wanninkhof et al. https://doi.org/10.25921/8c3k-vz52

OceanSODA-ETHZ: A global gridded dataset of the surface ocean carbonate system for seasonal to decadal studies of ocean acidification (v2023) (NCEI Accession 0220059). [indicate subset used]. NOAA National Centers for Environmental Informat Luke Gregor and Nicolas Gruber https://doi.org/10.25921/m5wx-ja34

Model code and software

Code for "Temperature effect on seawater ƒCO₂ revisited: theoretical basis, uncertainty analysis, and implications for parameterising carbonic acid equilibrium constants" Matthew P. Humphreys https://doi.org/10.5281/zenodo.13492772

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Short summary
The ocean takes up carbon dioxide (CO2) from the atmosphere, slowing climate change. This CO2 uptake is controlled by a property called ƒCO2. Seawater ƒCO2 changes as seawater warms or cools, although by an uncertain amount; measurements and calculations give inconsistent results. Here, we work out how ƒCO2 should, in theory, respond to temperature. This matches field data and model calculations but still has discrepancies with scarce laboratory results, which need more measurements to resolve.
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