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. 2014 Nov 20;5:5520. doi: 10.1038/ncomms6520

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(a) Atmospheric Δ¹⁴C based on IntCal13 (ref. 9) over the last 50 kyr (blue, left y axis, mean ±1σ). Calculated radiocarbon depletion resulting in Δ(Δ¹⁴C) (mean ±1σ) of soil carbon released during the B/A as a function of its age (magenta, right y axis, upper x axis) and of atmospheric Δ¹⁴C during time of production. (b) NGRIP temperature reconstruction33 from 120 to 10 kyr BP. The time series is plotted in two different colours because of the break in the x axis scale at 50 kyr BP. Numbers label selected D/O events. Red labelled arrows highlight the time which past since NGRIP was similar as warm as during the B/A (32 kyr since D/O event 12) and since the previous significant warming before the B/A (13 kyr since D/O 3).