scholarly journals Annual Variation in Atmospheric 14C Between 1700 BC and 1480 BC

Radiocarbon ◽  
2020 ◽  
Vol 62 (4) ◽  
pp. 939-952 ◽  
Author(s):  
Charlotte Pearson ◽  
Lukas Wacker ◽  
Alex Bayliss ◽  
David Brown ◽  
Matthew Salzer ◽  
...  
Keyword(s):  
Time Series ◽  
Northern Ireland ◽  
Annual Variation ◽  
Additional Data ◽  
Eastern Mediterranean ◽  
Calibration Dataset ◽  
University Of Arizona ◽  
Pinus Longaeva ◽  
Bristlecone Pine ◽  
The University

ABSTRACTIn 2018 Pearson et al. published a new sequence of annual radiocarbon (14C) data derived from oak (Quercus sp.) trees from Northern Ireland and bristlecone pine (Pinus longaeva) from North America across the period 1700–1500 BC. The study indicated that the more highly resolved shape of an annually based calibration dataset could improve the accuracy of 14C calibration during this period. This finding had implications for the controversial dating of the eruption of Thera in the Eastern Mediterranean. To test for interlaboratory variation and improve the robustness of the annual dataset for calibration purposes, we have generated a replicate sequence from the same Irish oaks at ETH Zürich. These data are compatible with the Irish oak 14C dataset previously produced at the University of Arizona and are used (along with additional data) to examine inter-tree and interlaboratory variation in multiyear annual 14C time-series. The results raise questions about regional 14C offsets at different scales and demonstrate the potential of annually resolved 14C for refining subdecadal and larger scale features for calibration, solar reconstruction, and multiproxy synchronization.

scholarly journals High-Precision Radiocarbon Measurements of Contemporaneous Tree-Ring Dated Wood from the British Isles and New Zealand: Ad 1850–950

Radiocarbon ◽  
2002 ◽  
Vol 44 (3) ◽  
pp. 633-640 ◽  
Author(s):  
A G Hogg ◽  
F G McCormac ◽  
T F G Higham ◽  
P J Reimer ◽  
M G L Baillie ◽  
...  
Keyword(s):  
New Zealand ◽  
Great Britain ◽  
Northern Ireland ◽  
Tree Ring ◽  
High Precision ◽  
Radiocarbon Dating ◽  
Quercus Petraea ◽  
Precision Measurements ◽  
Calibration Dataset ◽  
The University

The University of Waikato, Hamilton, New Zealand and The Queen's University of Belfast, Northern Ireland radiocarbon dating laboratories have undertaken a series of high-precision measurements on decadal samples of dendrochronologically dated oak (Quercus petraea) from Great Britain and cedar (Libocedrus bidwillii) and silver pine (Lagarostrobos colensoi) from New Zealand. The results show an average hemispheric offset over the 900 yr of measurement of 40 ± 13 yr. This value is not constant but varies with a periodicity of about 130 yr. The Northern Hemisphere measurements confirm the validity of the Pearson et al. (1986) calibration dataset.

scholarly journals Dendrochronology and Radiocarbon Dating: The Laboratory of Tree-Ring Research Connection

Radiocarbon ◽  
2009 ◽  
Vol 51 (1) ◽  
pp. 373-384 ◽  
Author(s):  
Steven W Leavitt ◽  
Bryant Bannister
Keyword(s):  
Head Start ◽  
Tree Ring ◽  
Radiocarbon Dating ◽  
Sample Treatment ◽  
University Of Arizona ◽  
Bristlecone Pine ◽  
Early Testing ◽  
The University ◽  
Relationship Of

The field of dendrochronology had a developmental “head start” of at least several decades relative to the inception of radiocarbon dating in the late 1940s, but that evolution was sufficiently advanced so that unique capabilities of tree-ring science could assure success of the 14C enterprise. The Laboratory of Tree-Ring Research (LTRR) at the University of Arizona played a central role in the cross-pollination of these disciplines by providing the first wood samples of exactly known age for the early testing and establishment of the “Curve of Knowns” by Willard Libby. From the 1950s into the early 1980s, LTRR continued to contribute dated wood samples (bristlecone pine and other wood species) to 14C research and development, including the discovery and characterization of de Vries/Suess “wiggles,” calibration of the 14C timescale, and a variety of tests to understand the natural variability of 14C and to refine sample treatment for maximum accuracy. The long and varied relationship of LTRR with 14C initiatives has continued with LTRR contributions to high-resolution studies through the 1990s and systematic efforts now underway that may eventually extend the bristlecone pine chronology back beyond its beginning 8836 yr ago as of 2009. This relationship has been mutualistic such that a half-century ago the visibility and stature of LTRR and dendrochronology were also elevated through their association with 14C-allied “hard sciences.”

scholarly journals La Jolla Measurements of Radiocarbon in Tree-Ring Dated Wood

Radiocarbon ◽  
1978 ◽  
Vol 20 (1) ◽  
pp. 1-18 ◽  
Author(s):  
H E Suess
Keyword(s):  
Tree Ring ◽  
Functional Dependence ◽  
Radiocarbon Dates ◽  
Pine Wood ◽  
University Of Arizona ◽  
Bristlecone Pine ◽  
The Absolute ◽  
La Jolla ◽  
The University

In 1969, at the Nobel Symposium on “Radiocarbon Variations and Absolute Chronology” in Uppsala, a curve was presented that illustrated the functional dependence of measured conventional radiocarbon dates on true historical ages of wood samples (Suess, 1971). The curve was derived from the results of La Jolla measurements of radiocarbon in bristlecone pine wood dendrochronologically dated by and obtained from Professor C W Ferguson of the University of Arizona (Ferguson, 1968). The curve was intended to be adequate for deriving calibrated radiocarbon dates and also for allowing fairly reliable estimates of the accuracy of the absolute dates obtained in this manner. The basis for the validity of this calibration is the well known fact that, for all practical purposes, wood samples that had grown at the same time show the same radiocarbon content. However, the reverse is not always true: Wood samples showing the same radiocarbon content do not necessarily have the same age because of the windings and steps of the curve (Stuiver and Suess, 1966).

The 14 C record in bristlecone pine wood of the past 8000 years based on the dendrochronology of the late C. W. Ferguson

1990 ◽  
Vol 330 (1615) ◽  
pp. 403-412 ◽  
Keyword(s):  
Tree Ring ◽  
General Trend ◽  
The Past ◽  
Secular Variations ◽  
University Of Arizona ◽  
Geophysical Parameter ◽  
Bristlecone Pine ◽  
Fourier Spectra ◽  
Pinus Aristata ◽  
The University

When, in 1950, Willard Libby and his coworkers obtained their first radiocarbon ( 14 C) dates, C. W. Ferguson at the University of Arizona Tree Ring Laboratory was working on establishing a continuous tree ring series for the newly discovered bristlecone pine Pinus aristata . Before his untimely death in 1986, he had extended the series nearly 8000 years into the past. From the Ferguson series I obtained for 14 C determinations wood samples grown at various times. Also, two other laboratories obtained such samples. For B.C. times in particular, our measured 14 C-values that deviated consistently from those calculated from tree rings, and the deviations increased with age. This general trend was observed by other laboratories, but the presence of deviations from these trends, of the so-called ‘wiggles’, was questioned by other workers. To me these wiggles indicated the existence of a most interesting geophysical parameter valid for the whole terrestrial atmosphere. Fourier spectra obtained at my request by Kruse in 1972, and by Neftel, demonstrated the consistency of the results, and supported my contention that the secular variations of 14 C in atmospheric CO 2 are related to variations of solar activity.

RADIOCARBON IN MEXICO: FROM PROPORTIONAL COUNTERS TO AMS

Radiocarbon ◽  
2021 ◽  
pp. 1-7
Author(s):  
Corina Solís ◽  
Efraín Chávez ◽  
Arcadio Huerta ◽  
María Esther Ortiz ◽  
Alberto Alcántara ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Sample Preparation ◽  
High Voltage ◽  
Accelerator Mass Spectrometry ◽  
Science And Technology ◽  
National Council ◽  
University Of Arizona ◽  
Technological Developments ◽  
High Voltage Engineering ◽  
The University

ABSTRACT Augusto Moreno is credited with establishing the first radiocarbon (14C) laboratory in Mexico in the 1950s, however, 14C measurement with the accelerator mass spectrometry (AMS) technique was not achieved in our country until 2003. Douglas Donahue from the University of Arizona, a pioneer in using AMS for 14C dating, participated in that experiment; then, the idea of establishing a 14C AMS laboratory evolved into a feasible project. This was finally reached in 2013, thanks to the technological developments in AMS and sample preparation with automated equipment, and the backing and support of the National Autonomous University of Mexico and the National Council for Science and Technology. The Mexican AMS Laboratory, LEMA, with a compact 1 MV system from High Voltage Engineering Europa, and its sample preparation laboratories with IonPlus automated graphitization equipment, is now a reality.

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