Extended Data Table 1 10Be and 26Al concentrations of the GISP2 bedrock core

From: Greenland was nearly ice-free for extended periods during the Pleistocene

  1. 10Be (n = 5) and 26Al (n = 2) depth profile data from the GISP-2 core. The mid-inventory depth is the depth dividing each core piece into two halves of equal 10Be and 26Al inventory. See also core stratigraphy in Fig. 1. We measured 5 core samples for 10Be. We combined the Al fractions (and splits for 27Al analysis) of GISP2/3 and GISP4 as well as of GISP5/6 and GISP7 to get two precise 26Al/27Al measurements. The given 1σ errors reflect analytical uncertainties. To compare 10Be and 26Al measurements directly in the same sample and to calculate the 26Al/10Be ratio, we also show the 10Be for GISP2/3/4 and GISP5/6/7, which are simply the sums of the measured 10Be atoms in the respective 10Be samples (GISP2/3 + GISP4 and GISP5/6 + GISP7). The ‘Quartz’ column gives the sample size.
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