Primary long-timescale series: CENCO2 Bayesian posterior (Hönisch et al., 2023) rendered as median with IQR and 95% credible interval bands.
Recent anchor series: Antarctic composite (Bereiter et al., 2015 update) and NOAA Mauna Loa monthly observations.
Why this 10 Myr build is different:
It drops GEOCARB (10 Myr steps, Phanerozoic carbon-cycle model) and instead uses a dedicated Cenozoic proxy synthesis as the backbone.
For this time window, that gives denser temporal support and uncertainty expressed directly as posterior quantiles.
Source details:
CENCO2 posterior values in the source file are in ln(CO2 ppm); they are converted here with exp(.) to ppm.
Antarctic composite ages are in yr BP (present=1950) and converted to Ma BP. Mauna Loa uses decimal CE years converted to Ma before 2026.