Extended Data Fig. 6: Concurrent changes in atmospheric CO2 and ΔDICas in core GGC90 at the Bølling onset.
From: Millennial and centennial CO2 release from the Southern Ocean during the last deglaciation
a, WDC ice-core atmospheric CO21. b, ΔDICas in core GGC90 (this study). The ramp fittings of atmospheric CO2 and ΔDICas records are indicated in gray and red lines, respectively. The estimated change-points (±standard errors) of the CO2 transition are: t1 (start) = 14.77±0.04 ka, t2 (end) = 14.63±0.03 ka. The estimated change-points (±standard errors) of the ΔDICas transition are: t1 (start) = 14.89±0.35 ka, t2 (end) = 14.53±0.34 ka. Note that the large errors with ΔDICas change-point dates are mainly sourced from the assumed uncertainties (±200 years) associated with surface reservoir ages used for age model constructions (Methods). The slightly broader ramp in ΔDICas at GGC90 is expected due to bioturbation. The results are based on 1,000 bootstrap replications. The black dash lines highlight the concurrence of the atmospheric and oceanic transitions. The analyses are based on Rampfit software89.
