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ToolsDutch, Victoria R., Bakker, Dorothee C. E., Roobaert, Alizée, Landschuetzer, Peter, Roden, Nicholas P., Hoppema, Mario and Kaiser, Jan (2025) The Arctic Ocean CO2 sink: Trends, uncertainties, and the impact of sea ice. Global Biogeochemical Cycles, 39 (8). ISSN 0886-6236
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Abstract
The Arctic Ocean covers 3 % of the Earth's surface but is estimated to contribute 5–14 % to the global ocean carbon sink. Sparse and unevenly distributed observations complicate our understanding of the size and the controlling mechanisms of this carbon sink. We adopt and advance the two-step neural network approach of Landschützer et al. (2016, https://doi.org/10.1002/2015gb005359; Self Organizing Map—Feed Forward Network) to improve region-specific reconstructions of the surface ocean partial pressure of carbon dioxide ((Formula presented.) ((Formula presented.))) in the Arctic Ocean and subsequently estimate the air-sea (Formula presented.) flux. Our study shows that biogeochemical properties previously selected as predictor variables for (Formula presented.) ((Formula presented.)) at the global scale are not well suited to the Arctic Ocean and a sensitivity study reveals large differences in the size of the Arctic Ocean carbon sink depending on the choice of air-sea (Formula presented.) flux parameterization. This is most acute for those relating to sea ice cover, leading to a difference of up to 25 % (9.2–13.3 Pg C) in the total size of the Arctic Ocean carbon sink over the 32-year duration of the study.
| Item Type: | Article |
|---|---|
| Additional Information: | Data Availability Statement: Forcing data for the SOM-FFN is available as outlined in Table 1. The final p(CO2) product and all 12 parameterizations from the flux sensitivity test are available at Dutch et al. (2025). Plotting and evaluation code available at: https://github.com/V-Dutch/ArcticSOMFFN. |
| Uncontrolled Keywords: | arctic ocean,ocean carbon sink,surface ocean pco,environmental science(all),global and planetary change,environmental chemistry,atmospheric science ,/dk/atira/pure/subjectarea/asjc/2300 |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 06 Aug 2025 16:30 |
| Last Modified: | 02 Sep 2025 08:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/100088 |
| DOI: | 10.1029/2025GB008576 |
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