Atmospheric Helium Three and Radiocarbon from Cosmic Radiation

Libby, W. F.

doi:10.1103/physrev.69.671.2

Cited by 285 publications

(152 citation statements)

References 13 publications

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“…Tritium is naturally produced in the upper layers of the atmosphere [Libby, 1946]. In the late 1950s and the early 1960s, atmospheric tests of nuclear weapons produced and released large amounts of tritium that exceeded the natural inventory by more than 2 orders of magnitude.…”

Section: Transient Tracer Backgroundmentioning

confidence: 99%

Tritium and CFC input functions for the Weddell Sea

Mensch¹,

Simon²,

Bayer³

1998

J. Geophys. Res.

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Section: Transient Tracer Backgroundmentioning

confidence: 99%

Tritium and CFC input functions for the Weddell Sea

Mensch¹,

Simon²,

Bayer³

1998

J. Geophys. Res.

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“…It was also found to be present naturally at a measurable level of about 15 beta-ray emissions per minute per gram of carbon, and this was followed by the bold proposal by Willard Libby (1946) that it could be used for dating the past. Dating was then demonstrated by patiently counting the number of beta-rays emitted from a known mass of historical carbon in a given time and using the laws of radioactive decay to determine the age relative to the half-life of 14 C. This demonstration was impressively successful and launched 14 C dating by beta-ray counting.…”

Section: Introductionmentioning

confidence: 99%

Developments in Radiocarbon Technologies: From the Libby Counter to Compound-Specific AMS Analyses

2009

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“…Subsequently, such 14 C entered the terrestrial carbon pool through plant photosynthesis, and eventually enriched in the soil organic matter [29][30][31]. Therefore, the 14 C peak can provide an extremely useful tool to quantify the turnover of the soil organic matter at timescales of a few years to a few hundred years through models [32].…”

mentioning

confidence: 99%

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

2013

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There still exist uncertainties in the trend, magnitude and efficiency of carbon sequestration with regard to the changes in soil organic carbon (SOC) pools after afforestation. In this study, SOC turnover times of the meadow steppe and planted forests at Saihanba Forest Station of Hebei Province, China are estimated by means of the radiocarbon ( 14 C) method. Our results show that the SOC turnover times can be as long as from 70 to 250 years. After planting the Pinus sylvestri var. mongolica in the Leymus chinensis meadow steppe, the turnover times of organic carbon in both bulk samples and soil aggregate fractions of the topsoils are decreased with an increase of the stand age. Such a lowering of the turnover time would cause an increase in soil CO 2 flux, implying that afforestation of grassland may reduce the capacity of topsoil to sequestrate organic carbon. Combined stable isotope and 14 C analyses on soil aggregate fractions suggest that there are different responses to afforestation of grassland between young and old carbon pools in topsoils. In the young and middle-age planted forests, the proportion of CO 2 emission from the older soil carbon pool shows an increasing trend. But in the mature planted forest, its proportion tends to decline, indicating that the stand age may influence the soil carbon sequestration mechanism. The CO 2 emission from the topsoils estimated using the 14 C method is relatively low compared to those by other methods and may be caused by the partial isolation of the young carbon component from the soil aggregates. For more accurate estimation of CO 2 flux, future studies should therefore employ improved methodology for more effective separation of different soil carbon components before isotope analyses.14 C, soil organic carbon turnover, aggregate fractions, Saihanba, afforestation of grassland, stand age Citation:Tan W B, Zhou L P, Liu K X. Soil aggregate fraction-based 14 C analysis and its application in the study of soil organic carbon turnover under forests of different ages.

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Atmospheric Helium Three and Radiocarbon from Cosmic Radiation

Cited by 285 publications

References 13 publications

Tritium and CFC input functions for the Weddell Sea

Tritium and CFC input functions for the Weddell Sea

Developments in Radiocarbon Technologies: From the Libby Counter to Compound-Specific AMS Analyses

Soil aggregate fraction-based 14C analysis and its application in the study of soil organic carbon turnover under forests of different ages

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