Anagnostou, Eleni , Babila, Tali, Chalk, Thomas, Henehan, Michael and Raitzsch, Markus (2023) Boron-CO2 workshop: Testing and extending the limits of the foraminiferal boron proxy for seawater pH and atmospheric CO2 reconstructions. Past Global Changes Magazine : PAGES magazine, 31 (1). p. 43. DOI 10.22498/pages.31.1.43.

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Abstract

Workshop report - Bergen, Norway, 4 September 2022

Atmospheric carbon dioxide (CO2) is the key driver of global temperatures over geological time, but calculating the exact sensitivity of Earth’s climate to CO2, and hence the trajectory of anthropogenic climate change, requires accurate quantification of past CO2. Determining past CO2 and fluxes among Earth's carbon reservoirs is difficult, particularly prior to ice-core records of the last 800 kyrs. Attempts have been made to compile multi-proxy atmospheric CO2 proxy data through time (Foster et al. 2017; Hönisch 2021; Rae et al. 2021) which have gained considerable traction, including in the Intergovernmental Panel on Climate Change reports (IPCC 2021). However, many of these compilations can include inaccuracies and apparent contradictions arising from differing assumptions and auxiliary inputs used when translating proxy data to CO2. To move forward as a community, ensuring the robustness of future CO2 data contributions and reducing noise in a crucial dataset, such inconsistencies must be minimized, and uncertainties systematically accounted for (Fig. 1).

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