Lukas Wacker

Datos Biográficos

ID2470367
NOMBRELukas Wacker
NOMBRESLukas
APELLIDOWacker
FIRMAWACKER L
AFILIACIONESETH Zurich
ORCID0000-0002-8215-2678
VERIFICADOSí
TOTAL DE OBRAS63
TOTAL DE CITAS1500
TOTAL COMO AUTOR63
TOTAL COMO EDITOR0
PRIMER AÑO DE PUBLICACIÓN2007
AÑO MÁS RECIENTE DE PUBLICACIÓN2026
ÍNDICE H11

  • An absolutely dated mid-Holocene English yew chronology offers new opportunities for archaeological and palaeoenvironmental research

    Open AccessTatiana Bebchuk, Darren Davies et al.ARTICLEThe Holocene2026Referencias: 14

    Research on Holocene climate variability and human history greatly benefits from annually resolved and absolutely dated tree-ring chronologies. The quality and quantity of such records, however, decline back in time, with little tree-ring evidence available for the Early and Middle Holocene. Here, we present a tree-ring width (TRW) chronology from 100 subfossil yews ( Taxus baccata L.) excavated from peat-rich soils in the Fenland region of easte…

  • Multi-Proxy Tree-Ring Dating during the Younger Dryas

    Frederick Reinig, Adam Sookdeo et al.ARTICLETree-Ring Research2025

    The world's longest tree-ring chronology comprises thousands of oak and pine series from Germany and continuously covers the Holocene back to 12,325 cal BP. A lack of relict wood from the Younger Dryas cold reversal ca. 12,900–11,700 cal BP, however, challenges the extension of this absolutely dated ring width record further back in time. Here, we combine 646 high-resolution stable oxygen isotope and 795 radiocarbon measurements from subfossil pi…

  • Pollen 14 C dating compared with established dating methods

    Open AccessKai Sebastian Nakajima, Caroline Welte et al.ARTICLERadiocarbon2025

    Radiocarbon ( 14 C) dating is a powerful tool for establishing reliable chronologies for proxy records recovered from environmental archives, including lacustrine sediments. However, lacustrine sediments are often limited with respect to availability of material such as terrestrial macrofossils that are traditionally targeted for 14 C dating. Flow cytometry, in combination with physicochemical preprocessing, is an emerging technique for the isola…

  • Towards online ramped oxidation (ORO)-AMS for thermal dissection and serial radiocarbon analysis of complex organic matter

    Open AccessMarco A Bolandini, Daniele De Maria et al.ARTICLERadiocarbon2025

    By constraining organic carbon (OC) turnover times and ages, radiocarbon ( 14 C) analysis has become a crucial tool to study the global carbon cycle. However, commonly used “bulk” measurements yield average turnover times, masking age variability within complex OC mixtures. One method to unravel intra-sample age distributions is ramped oxidation, in which OC is oxidized with the aid of oxygen at increasing temperatures. The resulting CO 2 is coll…

  • Radiocarbon measurements of dissolved inorganic carbon (DIC) in sediment porewater and seawater at AWI Micadas

    Open AccessHendrik Grotheer, Jens S Hammes et al.ARTICLERadiocarbon2025

    Radiocarbon ( 14 C) measurements on dissolved inorganic carbon (DIC) are a powerful tool to trace water masses and carbon cycling in the ocean. Existing methodologies to determine the 14 C content of seawater DIC requires large volumes of sample (usually >100 mL) and specialized graphitization techniques to achieve the accuracy and precision needed for meaningful data interpretation. The advancement of the CO 2 gas ionization accelerator mass spe…

  • The Burial from Aleti Tunu Bibi Cave, Atauro Island, East Timor

    Anne-Marie Bacon, Anne‐marie Bacon et al.ARTICLEAsian perspectives2025

    The Aleti Tunu Bibi cave, located on the small volcanic island of Atauro close to the island of Timor, is a sacred site for the region's inhabitants. The cave's archaeological potential was revealed in 2015 with the discovery of artifacts, rock art depicting marine fauna (mammals and reptiles), human remains, and a few remains of marine and terrestrial fauna. New material discovered in 2017 included sporadic remains of marine fauna, goats and pig…

  • Lea—a Novel Low Energy Accelerator for 14 C Dating

    Open AccessUrs Ramsperger, Daniele De Maria et al.ARTICLERadiocarbon2024Citada por: 1Referencias: 14

    A newly developed compact AMS, LEA (Low Energy Accelerator), is tested and compared with a state-of-the-art AMS system MICADAS (Mini Carbon Dating System), which has a precision performance of better than 1‰ for modern 14 C. The main difference between these two systems is the acceleration voltage, which has been reduced from 200 kV with the MICADAS system to 50 kV with the LEA system. In order to execute the final performance tests, exactly same…

  • Safe Preparation and Delivery of Graphite Targets for 14 C Analysis

    Open AccessLaura Tassoni, Bernd Kromer et al.ARTICLERadiocarbon2024Citada por: 1Referencias: 14

    Nowadays, most radiocarbon ( 14 C) laboratories can reliably avoid and remove any possible sample contamination during the pretreatment of organic samples (e.g., bones, charcoal, or trees) thanks to a series of methods commonly used by the radiocarbon community. However, what about the final step, the storage of graphite? Rarely do the laboratories produce their graphite and ship it as pressed targets to accelerator mass spectrometry (AMS) facili…

  • A Universal Gas Interface for Simultaneous 14 C and Δ 13 C Measurements

    Open AccessMelina Wertnik, Lukas Wacker et al.ARTICLERadiocarbon2024Referencias: 32

    While simultaneous radiocarbon and δ 13 C measurements have been available for organic materials (by accelerator mass spectrometry, AMS, and isotope ratio mass spectrometry, IRMS, respectively), this has not been possible for carbonates until now. Using an existing interface for gas ion source AMS measurements, we developed a prototype for a universal gas interface that allows simultaneous measurement of both carbon isotope ratios from potentiall…

  • Caveat emptor !—wiggle-matching European wood samples (AD 46–AD 286)

    Open AccessAlex Bayli, David Brown et al.ARTICLERadiocarbon2024Referencias: 41

    This study suggests that there may be considerable difficulties in providing accurate calendar age estimates in the Roman period in Europe, between ca. AD 60 and ca. AD 230, using the radiocarbon calibration datasets that are currently available. Incorporating the potential for systematic offsets between the measured data and the calibration curve using the ΔR approach suggested by Hogg et al. (2019), only marginally mitigates the biases in calen…

  • Contrasting paired benthic and planktonic foraminifera radiocarbon ages from Bermuda Rise ODP Site 1063 during Heinrich Stadials 1 and 2

    Open AccessJörg Lippold, Jens Fohlmeister et al.ARTICLERadiocarbon2024Referencias: 33

    We report 27 planktonic and 21 benthic radiocarbon ages from the subtropical marine sediment core ODP Site 1063 (Bermuda Rise) for the time range between 30 and 14 ka before present. Despite low abundances of benthic specimens, it was possible to measure radiocarbon ages down to ∼10 μg carbon using a MICADAS and the gas ion source developed at ETH Zurich. Based on a tentative radiocarbon–independent age-model we found that the radiocarbon reservo…

  • Preparation and Handling of Methane for Radiocarbon Analysis at Cologneams

    Open AccessJan Olaf Melchert, Martina Gwozdz et al.ARTICLERadiocarbon2024Citada por: 1Referencias: 26

    CH 4 is the second most important anthropogenic greenhouse gas and originates from different sources. The use of radiocarbon ( 14 C) analysis of CH 4 opens up the possibility to differentiate geological and agricultural origin. At the CologneAMS facility, the demand for 14 C analysis of CH 4 required the development of a sample handling routine and a vacuum system that converts CH 4 to CO 2 for direct injection of CO 2 into the AMS. We evaluated …

  • To date or not to date? A comparison of different 14 C pretreatment methods applied to archeological marine shells from Vale Boi (Portugal)

    Open AccessDragana Paleček, Giuseppe Falini et al.ARTICLERadiocarbon2024Referencias: 90

    Mollusk shells are often found in archeological sites, given their great preservation potential and high value as a multipurpose resource, and they can often be the only available materials useful for radiocarbon ( 14 C) dating. However, dates obtained from shells are often regarded as less reliable compared to those from bones, wood, or charcoals due to different factors (e.g., Isotope fractionation, reservoir effects etc.). The standard acid et…

  • Comparability of Radiocarbon Measurements in Dissolved Inorganic Carbon of Seawater Produced at Eth-Zurich

    Open AccessMaxi Castrillejo, Roberta L Hansman et al.ARTICLERadiocarbon2024Citada por: 1Referencias: 18

    Radiocarbon observations (Δ 14 C) in dissolved inorganic carbon (DIC) of seawater provide useful information about ocean carbon cycling and ocean circulation. To deliver high-quality observations, the Laboratory of Ion Beam Physics (LIP) at ETH-Zurich developed a new simplified method allowing the rapid analysis of radiocarbon in DIC of small seawater samples, which is continually assessed by following internal quality controls. However, a compar…

  • C Microsample Analysis With Echomicadas Facilities

    Open AccessFrançois Thil, Nadine Tisnerat-Laborde et al.ARTICLERadiocarbon2024Referencias: 10

    In 2015, a new accelerator mass spectrometry facility (AMS), the ECHoMICADAS (Environnement, Climat, Homme, MIni CArbon DAting System), was installed in the Laboratoire des Sciences du Climat et de l’Environnement (LSCE). Equipped with a hybrid source, it allows the analysis of solid or gas samples for 14 C measurement. Here, we summarize the equipment surrounding the Gas Interface System (GIS), namely the elemental analyzer (EA), the carbonate h…

  • Origin and Age of Carbon in the Cellulose of Mid-Latitude Tree Rings

    Open AccessBernd Kromer, Lukas Wacker et al.ARTICLERadiocarbon2024Citada por: 1

    Cellulose of tree rings is often assumed to be predominantly formed by direct assimilation of CO 2 by photosynthesis and consequently can be used to reconstruct past atmospheric 14 C concentrations at annual resolution. Yet little is known about the extent and the age of stored carbon from previous years used in addition to the direct assimilation in tree rings. Here, we studied 14 C in earlywood and latewood cellulose of four different species (…

  • Development of the Intcal Database

    Open AccessChristopher B Ramsey, Florian Adolphi et al.ARTICLERadiocarbon2024Citada por: 1Referencias: 17

    The IntCal family of radiocarbon ( 14 C) calibration curves is based on research spanning more than three decades. The IntCal group have collated the 14 C and calendar age data (mostly derived from primary publications with other types of data and meta-data) and, since 2010, made them available for other sorts of analysis through an open-access database. This has ensured transparency in terms of the data used in the construction of the ratified c…

  • A Late Holocene climate reconstruction from the high-altitude Lake Gölcük sedimentary records, Isparta (SW Anatolia)

    Open AccessIliya Bauchi Danladi, Sena Akçer Ön et al.ARTICLEQuaternary Research2023

    A high-resolution multiproxy lake sediment dataset, comprising lithology, radiography, μXRF elemental, magnetic susceptibility (MS), δ 13 C, and δ 18 O measurements since ca. AD 400 is presented in this study. Changes in lithology, radiography, magnetic susceptibility (MS), δ 13 C, and δ 18 O reflect wet/dry climate periods, whereas variability in log(Ca/K) can reflect warm/cold climate periods. Analyses of the multiproxy results allow the distin…

  • Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula

    Open AccessPablo Heredia Barión, Stephen J Robert et al.ARTICLEThe Holocene2023Referencias: 36

    To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began after c. 15 cal. ka BP and had progressed to within present-day limits on the Fildes Peninsula, its largest ice-free peninsula, by c. 6.6–5.3 cal. ka …

  • The glacier advance at the onset of the Little Ice Age in the Alps

    Open AccessKurt Nicolussi, Melaine Le Roy et al.ARTICLEThe Holocene2022Citada por: 3Referencias: 8

    The term ‘Little Ice Age’ (LIA) is classically used to define a period of repeated and extensive glacier advances during the last millennium. In the meanwhile, this term is also used to address the period of relatively low temperatures between the Medieval Climate Anomaly (MCA), or Medieval Warm Period, and present-day warming. The end of the LIA is generally set to the mid or late 1800s CE, however, the published onset dates of the LIA are more …

  • Premature Oxidation During Argon Plasma Cleaning of Water-Rich Radiocarbon Samples

    Open AccessJ Royce Cox, Eric Blinman et al.ARTICLERadiocarbon2022Referencias: 13

    Plasma oxidation for 14 C sampling utilizes low-pressure (133 Pa), low-energy ( 2 -plasmas generating CO 2 for AMS dating. O 2 -plasmas on empty chambers remove organic contamination. When clean, a new specimen is inserted and Ar-plasmas dislodge adsorbed atmospheric CO 2 from surfaces. Finally, O 2 -plasmas oxidize organic materials to CO 2 for AMS analysis. During some Ar-plasmas we observed anomalous pressure increases and unexpectedly high CO…

  • Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages

    Open AccessMatthias Moros, Patrick De Deckker et al.ARTICLEQuaternary Research2021

    Northern and southern hemispheric influences—particularly changes in Southern Hemisphere westerly winds (SSW) and Southern Ocean ventilation—triggered the stepwise atmospheric CO 2 increase that accompanied the last deglaciation. One approach for gaining potential insights into past changes in SWW/CO 2 upwelling is to reconstruct the positions of the northern oceanic fronts associated with the Antarctic Circumpolar Current. Using two deep-sea cor…

  • Re-dating the Lower Pecos Canyonlands SMM (Skiles) mummy burial, dating a red-colored deerskin strap

    Open AccessM W Rowe, Eric Blinman et al.ARTICLEJournal of Archaeological Science…2021Referencias: 4

  • Radiocarbon Protocols and First Intercomparison Results From the Chronos 14 Carbon-Cycle Facility, University of New South Wales, Sydney, Australia

    Open AccessChris Turney, Lorena Becerra-Valdivia et al.ARTICLERadiocarbon2021Citada por: 12Referencias: 81

    The Chronos 14 Carbon-Cycle Facility is a new radiocarbon laboratory at the University of New South Wales, Australia. Built around an Ionplus 200 kV MIni-CArbon DAting System (MICADAS) Accelerator Mass Spectrometer (AMS) installed in October 2019, the facility was established to address major challenges in the Earth, Environmental and Archaeological sciences. Here we report an overview of the Chronos facility, the pretreatment methods currently e…

  • Gas Ion Source Performance of the Environmicadas at Hekal Laboratory, Debrecen, Hungary

    Open AccessMiklós Molnár, Marianna Mészáros et al.ARTICLERadiocarbon2021Citada por: 4Referencias: 19

    A coupled accelerator mass spectrometer–gas interface system has been successfully operating at the Hertelendi Laboratory of Environmental Studies, Debrecen, Hungary, since 2013. Over the last 6 years more than 500 gas targets were measured below 100 μg carbon content for carbon isotopic composition. The system was tested with blanks, OxII, IAEA-C1, IAEA-C2, and IAEA-C7 standards. The performance of our instrumentation shows good agreement with o…