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A new reconstruction of past atmospheric Δ 14 C (Δ 14 C atm ) based on Polish lake varved sediments has suggested that previous Δ 14 C atm values (e.g. from the Cariaco basin record) for the beginning of the Younger Dryas cold event (YD) are overestimates and that the Δ 14 C atm rise at the YD...
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