A5056586938- Geology and Paleoclimatology Research
- Archaeology and ancient environmental studies
- Tree-ring climate responses
- Pleistocene-Era Hominins and Archaeology
- Plant Water Relations and Carbon Dynamics
- Pacific and Southeast Asian Studies
- Library Science and Information Systems
- Chinese history and philosophy
- Historical, Religious, and Philosophical Studies
- Isotope Analysis in Ecology
- Ancient Mediterranean Archaeology and History
- Archaeological Research and Protection
- Japanese History and Culture
- Astro and Planetary Science
- Climate variability and models
- Geomagnetism and Paleomagnetism Studies
- Landslides and related hazards
- Geological and Geochemical Analysis
- Fire effects on ecosystems
- Digital Humanities and Scholarship
- Hydrocarbon exploration and reservoir analysis
- Ancient Egypt and Archaeology
- Vietnamese History and Culture Studies
- Cultural Heritage Materials Analysis
- Interdisciplinary Research and Collaboration
University of Hohenheim
2014-2025
Universität Hamburg
2017-2024
Dr. August Wolff (Germany)
2021
Stuttgart Observatory
2021
Heidelberg University
2014-2020
University of Arizona
2004-2020
Institut de l'Information Scientifique et Technique
2004-2020
University of Erfurt
2020
Literaturarchiv
2020
New York University Press
2017
The IntCal09 and Marine09 radiocarbon calibration curves have been revised utilizing newly available updated data sets from 14 C measurements on tree rings, plant macrofossils, speleothems, corals, foraminifera. were derived the using random walk model (RWM) used to generate Marine09, which has account for additional uncertainties error structures. new ratified at 21st International Radiocarbon conference in July 2012 are as Supplemental Material www.radiocarbon.org. database can be accessed...
ABSTRACT Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating fluctuations in atmospheric C concentration. Although curves are constructed from independently archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume international both Northern...
The IntCal04 and Marine04 radiocarbon calibration curves have been updated from 12 cal kBP (cal is here defined as thousands of calibrated years before AD 1950), extended to 50 kBP, utilizing newly available data sets that meet the IntCal Working Group criteria for pristine corals other carbonates quantification uncertainty in both 14 C calendar timescales established 2002. No change was made 0–12 kBP. were constructed using a Markov chain Monte Carlo (MCMC) implementation random walk model...
A new calibration curve for the conversion of radiocarbon ages to calibrated (cal) has been constructed and internationally ratified replace IntCal98, which extended from 0–24 cal kyr BP (Before Present, 0 = AD 1950). The data set terrestrial samples extends 0–26 BP, but with much higher resolution beyond 11.4 than IntCal98. Dendrochronologically-dated tree-ring cover period 0–12.4 BP. Beyond end tree rings, marine records (corals foraminifera) are converted atmospheric equivalent a...
New radiocarbon calibration curves, IntCal04 and Marine04, have been constructed internationally ratified to replace the terrestrial marine components of IntCal98. The new data sets extend an additional 2000 yr, from 0–26 cal kyr BP (Before Present, 0 = AD 1950), provide much higher resolution, greater precision, more detailed structure than For Marine04 curve, dendrochronologically-dated tree-ring samples, converted with a box diffusion model mixed-layer ages, cover period 0–10.5 BP. Beyond...
Precise and direct dating of the Minoan eruption Santorini (Thera) in Greece, a global Bronze Age time marker, has been made possible by unique find an olive tree, buried alive life position tephra (pumice ashes) on Santorini. We applied so-called radiocarbon wiggle-matching to carbon-14 sequence tree-ring segments constrain date range 1627-1600 B.C. with 95.4% probability. Our result is previous, less precise, results several scientific methods, but it century earlier than derived from...
The prototype mini carbon dating system (MICADAS) at ETH Zurich has been in routine operation for almost 2 yr. Because of its simple and compact layout, setting up a radiocarbon measurement is fast the runs very reliably over days or even weeks without retuning. stability instrument responsible good performance highest-precision measurements where results single samples can be reproduced within less than 2‰. are described MICADAS demonstrated on measured data.
Abstract The increasing carbon dioxide (CO 2 ) concentration in the atmosphere combination with climatic changes throughout last century are likely to have had a profound effect on physiology of trees: altering and water fluxes passing through stomatal pores. However, magnitude spatial patterns such natural forests remain highly uncertain. Here, stable isotope ratios from network 35 tree‐ring sites located across Europe investigated determine intrinsic water‐use efficiency ( iWUE ), ratio...
The combined oak and pine tree-ring chronologies of Hohenheim University are the backbone Holocene radiocarbon calibration for central Europe. Here, we present revised chronology (HOC) Preboreal (PPC) with respect to revisions, critical links, extensions. Since 1998, HOC has been strengthened by new trees starting at 10,429 BP (8480 BC). Oaks affected cockchafer have identified discarded from chronology. formerly floating PPC cross-matched dendrochronologically absolutely dated chronology,...
Miyake et al. (henceforth M12) recently reported, based on 14C data, an extreme cosmic event ca. AD775. Using a simple model, M12 claimed that the was too strong to be caused by solar flare within standard theory. This implied new paradigm of either impossibly or very ray unknown origin occurred We show strength significantly overestimated M12. Several subsequent works have attempted find possible exotic source for such event, but they are all incorrect estimates revisit this with analysis...
High-quality data from appropriate archives are needed for the continuing improvement of radiocarbon calibration curves. We discuss here basic assumptions behind 14 C dating that necessitate and relative strengths weaknesses which obtained. also highlight procedures, problems, uncertainties involved in determining atmospheric surface ocean C/ 12 these archives, including a discussion various methods used to derive an independent absolute timescale uncertainty. The types required current...
Combining nine tree growth proxies from four sites, the west coast of Norway to Kola Peninsula NW Russia, provides a well replicated (> 100 annual measurements per year) mean index over last 1200 years that represents much northern pine timberline forests Fennoscandia. The simple series, z-scored their common period, correlates strongly with June August temperature averaged this region ( r = 0.81), allowing reconstructions summer based on regression and variance scaling. correlate...
The radiocarbon calibration curve IntCal04 extends back to 26 cal kyr B P. While several high-resolution records exist beyond this limit, these data sets exhibit discrepancies of up millennia. As a result, no for the time range 26–50 BP can be recommended as yet, but in paper working group compares available and offers discussion information that they hold.
A highly resolved record of the depositional frequency subfossil trees since 8263 bc in valley River Main is presented. Different aspects forest dynamics are explored including anomal ies (phases low or zero departures), changes density based on tree growth trend classes (GTCs), and regeneration using mean lifespan (ML) data. This reveals a number climatically induced environmental that synchronous with events North Atlantic region therefore may reflect facet climate system. Three periods...
Zusammenfassung Anhand gepoolter Datensätze dreier Schulabgängerbefragungen des Bundesinstituts für Berufsbildung (BIBB) wird der Frage nach dem Grad und den Ursachen Benachteiligung Jugendlicher ausländischer Herkunft beim Zugang zu Ausbildungsplätzen nachgegangen. Es untersucht, welche Rolle folgende Unterschiede zwischen Ausbildungsplatzsuchenden deutscher spielen: ihre Präferenzen eine bestimmte berufliche Ausbildung, Ausstattung mit arbeitsmarktrelevanten Ressourcen sowie ihnen offen...
Oak and pine samples housed at the Institute of Botany, University Hohenheim, are backbone early Holocene part radiocarbon calibration curve, published in 1993 (Becker 1993; Kromer Becker Stuiver Vogel et al. 1993). Since then chronologies have been revised. The revisions include 1) discovery 41 missing years oak chronology 2) a shift 54 yr for oldest back into past. was also extended with new as far 10,429 BP (8480 BC). In addition, formerly tentatively dated 1993) has rebuilt shifted to an...
We built a floating, 1382-ring pine chronology covering the radiocarbon age interval of 12,000 to 10,650 BP. Based on strong rise Δ 14 C at onset Younger Dryas (YD) and wiggle-matching decadal-scale fluctuations, we can anchor floating Cariaco varve chronology. observe marine reservoir correction higher than hitherto assumed for site, up 650 yr instead 400 yr, full length comparison interval. The tree-ring shows several fluctuations short duration (a few decades) 13,800; 13,600; 13,350 cal...