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      Radiocarbon Age Calibration of Marine Samples Back to 9000 Cal Yr BP

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      Radiocarbon

      Cambridge University Press (CUP)

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          Abstract

          Calibration curves spanning several millennia are now available in this special issue ofRadiocarbon. These curves, nearly all derived from the14C age determinations of wood samples, are to be used for the age conversion of samples that were formed through use of atmospheric CO2. When samples are formed in reservoirs (eg, lakes and oceans) that differ in specific14C content from the atmosphere, an age adjustment is needed because a conventional14C age, although taking into account14C (and13C) fractionation, does not correct for the difference in specific14C activity (Stuiver & Polach, 1977). The14C ages of samples grown in these environments are too old, and a reservoir age correction has to be applied. This phenomenon has been referred to as the reservoir effect (Stuiver & Polach, 1977).

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          Discussion Reporting of 14C Data

          Count rates, representing the rate of 14C decay, are the basic data obtained in a 14C laboratory. The conversion of this information into an age or geochemical parameters appears a simple matter at first. However, the path between counting and suitable 14C data reporting (table 1) causes headaches to many. Minor deflections in pathway, depending on personal interpretations, are possible and give end results that are not always useful for inter-laboratory comparisons. This discussion is an attempt to identify some of these problems and to recommend certain procedures by which reporting ambiguities can be avoided.
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            Evidence from polar ice cores for the increase in atmospheric CO2 in the past two centuries

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              Apparent Radiocarbon Ages of recent marine shells from Norway, Spitsbergen, and Arctic Canada

              The mean apparent radiocarbon ages of marine shells, colleted alive before the initiation of atomic bomb testing, and also before the main input of dead carbon derived from fossil fuels, are found to be 440 yr for the coast of Norway, 510 yr for Spitsbergen, and 750 yr for Ellesmere Island, Arctic Canada. The relationship between these apparent ages and the oceanic circulation pattern, is discussed. Also possible variations of the apparent ages back in time are discussed.
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                Author and article information

                Journal
                applab
                Radiocarbon
                Radiocarbon
                Cambridge University Press (CUP)
                0033-8222
                1945-5755
                1986
                July 2016
                : 28
                : 2B
                : 980-1021
                10.1017/S0033822200060264
                © 1986

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