High-resolution accelerator-mass-spectrometer radiocarbon dating was performed on late-glacial macrofossils in lake sediments from Kodiak Island, Alaska, and on shells in marine sediments from southwest Sweden. In both records, a dramatic drop in radiocarbon ages equivalent to a rise in the atmospheric 14C by ∼70‰ coincides with the beginning of the cold period at 11 000 yr B.P. (14C age). Thus, our results show that a close correlation between climatic records around the globe is possible by using a global signature of changes in atmospheric 14C content.

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