RSS 1.0Radiocarbon, Volume 40 (1998)
ABOUT THIS COLLECTION
Radiocarbon is the main international journal of record for research articles and date lists relevant to 14C and other radioisotopes and techniques used in archaeological, geophysical, oceanographic, and related dating.
This archive provides access to Radiocarbon Volumes 1-54 (1959-2012).
As of 2016, Radiocarbon is published by Cambridge University Press. The journal is published quarterly. Radiocarbon also publishes conference proceedings and monographs on topics related to fields of interest. Visit Cambridge Online for new Radiocarbon content and to submit manuscripts.
ISSN: 0033-8222
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Radiocarbon, Volume 40, Number 3 (INTCAL 98: Calibration Issue, 1998)Department of Geosciences, The University of Arizona, 1998-01-01
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Radiocarbon, Volume 40, Number 1 (Proceedings of the 16th International Radiocarbon Conference, 1998)Department of Geosciences, The University of Arizona, 1998-01-01
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Radiocarbon, Volume 40, Number 2 (Proceedings of the 16th International Radiocarbon Conference, June 16-20, 1997, Part 2: Applications, 1998)Department of Geosciences, The University of Arizona, 1998-01-01
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Conference ParticipantsDepartment of Geosciences, The University of Arizona, 1998-01-01
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Associate EditorsDepartment of Geosciences, The University of Arizona, 1998-01-01
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Associate EditorsDepartment of Geosciences, The University of Arizona, 1998-01-01
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Associate EditorsDepartment of Geosciences, The University of Arizona, 1998-01-01
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1998 Price ListDepartment of Geosciences, The University of Arizona, 1998-01-01
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1999 Price ListDepartment of Geosciences, The University of Arizona, 1998-01-01
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Variations of Radiocarbon in Tree Rings: Southern Hemisphere Offset Preliminary ResultsThe Queen's University of Belfast, Northern Ireland and University of Waikato, Hamilton, New Zealand radiocarbon laboratories have undertaken a series of high-precision measurements on decadal samples of dendrochronologically dated oak (Quercus patrea) and cedar (Libocedrus bidwillii) from Great Britain and New Zealand, respectively. The results show a real atmospheric offset of 3.4 +/0.6% (27.2 +/4.7 14C yr) between the two locations for the interval AD 1725 to AD 1885, with the Southern Hemisphere being depleted in 4C. This result is less than the value currently used to correct Southern Hemisphere calibrations, possibly indicating a gradient in Delta-14C within the Southern Hemisphere.
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Using 14C as a Tracer of Carbon Accumulation and Turnover in SoilsThree very different Canadian soils—clay soils of the St. Lawrence Lowlands, sandy forest soils of the Ottawa Valley, and organic-rich sediments from a wetland on the Canadian Shield—have been cored, sliced and separated into different density fractions, and the radiocarbon content of these soil fractions measured. In two of the areas sampled, cores were obtained close to operating nuclear reactors, as well as from beyond their region of influence. As a consequence, it has been possible to ascertain the depths of penetration of both the weapons-testing pulse (peaking in 1963), and a 25-50-yr chronic reactor input of 14C. The percentage of carbon stored in different density fractions varied with soil type. Turnover times for bulk soil organic carbon, estimated from soil degassing rates, have been compared with those predicated on the residual "bomb" 14C in background cores, and/or on the ratio of reactor-emitted 14C retained in the soils to the total deposited during the lifetime of operation. Residence times for the heavy carbon fraction present at depths below the influence of anthropogenic inputs have also been estimated. The accumulated data will be incorporated in a revised soil model, adjusted for the parameters deemed to be most important to carbon turnover rates under Canadian conditions.
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The 14C Age of Palsas in Northern EurasiaWe discuss results of 14C dating peat of palsa of different regions of Northern Eurasia. We apply these dates to determine the age of active palsa growth during different periods of the Holocene in permafrost zone.
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The 14C Age of Humic Substances in PaleosolsBy comparing the radiocarbon age of the soils under burial mounds of known archaeological age with the surface-exposed (background) soils of the surrounding landscapes, we may evaluate the rates of humus renewal in these soils. In the cold climate of the mideastern areas of the Russian plains, the value of humus rejuvenation coefficient decreases. This shows that humus renewal is 5-10 times slower than in the warmer climate of the southern regions. Using the obtained data on the rejuvenation rate of humus substances, we can determine the age of paleosols and study the dynamics of the carbon exchange processes in the biosphere.
