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      Radiocarbon Levels in the Iceland Sea from 25–53 kyr and their Link to the Earth's Magnetic Field Intensity

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          Abstract

          By correlating the climate records and radiocarbon ages of the planktonic foraminiferaN. pachyderma(s) of deep-sea core PS2644 from the Iceland Sea with the annual-layer chronology of the GISP2 ice core, we obtained 80 marine14C calibration points for the interval 11.4-53.3 ka cal BP. Between 27 and 54 ka cal BP the continuous record of14C/cal age differences reveals three intervals of highly increased14C concentrations coincident with low values of paleomagnetic field intensity, two of which are attributed to the geomagnetic Mono Lake and Laschamp excursions (33.5-34.5 ka cal BP with maximum 550 marine δ14C, and 40.3-41.7 ka cal BP with maximum 1215 marine δ14C, respectively). A third maximum (marine δ14C: 755) is observed around 38 ka cal BP and attributed to the geomagnetic intensity minimum following the Laschamp excursion. During all three events the A14C values increase rapidly with maximum values occurring at the end of the respective geomagnetic intensity minimum. During the Mono Lake Event, however, our A14C values seem to underestimate the atmospheric level, if compared to the36Cl flux measured in the GRIP ice core (Wagner et al. 2000) and other records. As this excursion coincides with a meltwater event in core PS2644, the underestimation is probably caused by an increased planktonic reservoir age. The same effect also occurs from 38.5 to 40 ka cal BP when the meltwater lid of Heinrich Event 4 affected the planktonic record.

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          On the North Atlantic Circulation

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            Validity of the temperature reconstruction from water isotopes in ice cores

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              The Greenland Ice Sheet Project 2 depth-age scale: Methods and results

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                Author and article information

                Journal
                applab
                Radiocarbon
                Radiocarbon
                Cambridge University Press (CUP)
                0033-8222
                1945-5755
                2000
                July 2016
                : 42
                : 03
                : 437-452
                Article
                10.1017/S0033822200030368
                a7cef0ee-c1b9-446b-912b-1d6f23a4f186
                © 2000
                History

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