Fig. 5: Reconstruction of paleo-atmospheric CO2 concentrations.
From: Traces of the oxygen isotope composition of ancient air in fossilized cosmic dust
Displayed are pCO2 reconstructions determined in this study based on fossil I-type cosmic spherules (labeled) in comparison to published data throughout the Phanerozoic, reconstructed with proxies33,36,37 and a mass balance model (GEOCARBSULF)34,35. Proxies include δ13C in liverworts, alkenones (phytoplankton) or paleosols, leaf stomata density and index of land plants and boron isotopes in foraminifers. The light blue trend indicates a 0.5 Myr spaced LOESS fit through the proxy data33. The light brown trend shows the GEOCARBSULF mass balance model34 with an associated uncertainty interval35. The 1SD uncertainties of individual proxies are displayed as black error bars. For the I-type cosmic spherules 1SD error bars are displayed in blue. The average SUT data point is marginally shifted along the time axis to avoid overlapping the two source data points (SUT11-3 and SUT16-1).
