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• W2022794259 abstract "A new reconstruction of past atmospheric Δ14C (Δ14Catm) based on Polish lake varved sediments has suggested that previous Δ14Catm values (e.g. from the Cariaco basin record) for the beginning of the Younger Dryas cold event (YD) are overestimates and that the Δ14Catm rise at the YD onset could only be due to changes in atmospheric 14C production (PC-14). This result would have profound climatic implications, for the YD is a paradigm example of abrupt climate change which is usually thought to have been triggered by a reduction in the northward heat flux by the Atlantic thermohaline circulation. Here we examine results from a large number of simulations (300) based on a zonally averaged ocean circulation model, to constrain the effect on Δ14Catm of PC-14 changes during the YD as reconstructed from a Greenland ice core record of 10Be flux. Our results suggest that the scatter in the lake data set is too large to exclude the probable change in deep ocean ventilation at the onset of the YD. By contrast, the model fit to the higher Δ14Catm levels throughout the YD detected in the marine record is generally better when a substantial decrease in deep ocean ventilation is simulated. The early Δ14Catm drawdown that initiated during the first half of the YD, however, could entirely be due to production changes. If this was the case, the drawdown would not reflect an increasing formation of North Atlantic Intermediate Water or Southern Ocean water, as previously suggested. The rapid Δ14Catm rise at the YD onset documented in the marine record, however, remains unexplained." @default.
• W2022794259 created "2016-06-24" @default.
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• W2022794259 date "2001-02-01" @default.
• W2022794259 modified "2023-10-17" @default.
• W2022794259 title "Atmospheric radiocarbon during the Younger Dryas: production, ventilation, or both?" @default.
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• W2022794259 doi "https://doi.org/10.1016/s0012-821x(00)00383-6" @default.
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