Data Management in Dendroarchaeology Using Tellervo

Brewer, Peter W.

doi:10.1017/s0033822200050384

Cited by 12 publications

(13 citation statements)

References 12 publications

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“…Precise measurements (ca. 0.01 mm) were made for each growth ring present in every sample using a light-reflected microscope, digitized Velmex measuring platform, and Tellervo software (http://www.tellervo.org; Brewer et al 2010;Brewer 2014). Where practical, multiple radii were measured to check for reproducibility of ring-width measurements and to combat idiosyncrasies in the growth pattern.…”

Section: Methodsmentioning

confidence: 99%

Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks

et al. 2014

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A total of 272 oak (Quercus sp.) samples have been collected from large subfossil trees dredged from sediment deposited by the Sava and various tributary rivers in the Zagreb region of northwestern Croatia, and in northern Bosnia and Herzegovina. Measurement series of tree-ring widths from these samples produced 12 groups, totaling 3456 years of floating tree-ring chronologies spread through the last ca. 8000 years. This work represents the first step in creating a new, high-resolution resource for dating and paleoenvironmental reconstruction in the Balkan region and potentially a means to bridge between the floating tree-ring chronologies of the wider Mediterranean region and the continuous long chronologies from central Europe.

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Section: Methodsmentioning

confidence: 99%

Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks

et al. 2014

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“…The full chronology, first published in relative years and by 14 C wiggle-match dating by Kuniholm et al 1996, has recently been refined to a fixed calendar dated range (Pearson et al forthcoming). The samples were prepared by sanding, measured and cross-checked using Tellervo (Brewer 2014). Whole rings were dissected representing a growth season of between April to November, with potential for extended growth later in the year or to have bimodal xylogenisis within this period (Camarero et al 2010).…”

Section: Tree-ring Sampling and Chronological Verificationmentioning

confidence: 99%

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

et al. 2020

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In 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.

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“…Samples were surfaced and cross‐dated following standard dendrochronological techniques (Stokes & Smiley, ). Total ring widths, EW width, and LW width of each core were measured to the nearest 0.01 mm using a VELMEX measurement system (Velmex Inc., 2016) and Tellervo software (Brewer, ). Crossdating and measurement accuracy were verified using COFECHA (Grissino‐Mayer, ; Holmes, ).…”

Section: Methodsmentioning

confidence: 99%

Snowpack‐ and Soil Water Content‐Related Hydrologic Indices and Their Association With Radial Growth of Conifers in the Sierra Nevada, California

et al. 2020

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The utility of a high-resolution snow-hydrologic model to derive climatological indices that describe the variability in radial growth of four conifer species in two Sierra Nevada sites is presented herein. Nine annual indices associated with radial growth were developed to represent the winter dormancy, characteristics of the snowpack and soil water content, and the duration of the seasons. Site chronologies of earlywood (EW) and latewood (LW) ring widths were developed for mountain hemlock (Tsuga mertensiana), red fir (Abies magnifica), white fir (Abies concolor), and ponderosa pine (Pinus ponderosa) at two sites on leeward and windward slopes. The signal strength for annual climatological indices derived from model output was tested with correlation and regression, in combination with principal components analysis. Results show significant snow-related climate signal in the tree-ring data, with substantial differences between species and between EW and LW. Dependence on previous year's snow and soil moisture (a lagged response) were found for EW of hemlock and red fir. The primary EW-LW signal contrast for those species is a shift toward dependence on current-year moisture conditions for LW, especially for red fir. Lagged climate response was less evident for white fir and ponderosa pine. Regression of tree-ring series on principal components of climatological indices showed a stronger average signal in EW (R 2 = 0.48) than in LW (R 2 = 0.35). Differences in tree-ring hydrologic signal at the two sites are attributed to microclimate and contrasts in snow regime. Results attest to the hydrologic model usefulness for investigating temporal relationships between tree rings and local climate.

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Data Management in Dendroarchaeology Using Tellervo

Cited by 12 publications

References 12 publications

Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks

Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks

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

Snowpack‐ and Soil Water Content‐Related Hydrologic Indices and Their Association With Radial Growth of Conifers in the Sierra Nevada, California

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Data Management in Dendroarchaeology Using Tellervo

Cited by 12 publications

References 12 publications

Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks

Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks

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

Snowpack‐ and Soil Water Content‐Related Hydrologic Indices and Their Association With Radial Growth of Conifers in the Sierra Nevada, California

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Product

Resources

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