A5027566531- Archaeology and ancient environmental studies
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Forensic and Genetic Research
- Indigenous Studies and Ecology
- Atmospheric Ozone and Climate
- Radiation Therapy and Dosimetry
- Cryospheric studies and observations
- Soil Geostatistics and Mapping
- Ion-surface interactions and analysis
- Marine Sponges and Natural Products
- Geological Studies and Exploration
- Maritime and Coastal Archaeology
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Crustacean biology and ecology
Max Planck Institute for Biogeochemistry
2004-2024
Max Planck Society
2008-2014
University of Maine
2003
Johannes Gutenberg University Mainz
1988-1998
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
1997
Institut Laue-Langevin
1992
GSI Helmholtz Centre for Heavy Ion Research
1987-1990
Research Association for Combustion Engines
1990
Sponges are probably the earliest branching animals and their fossil record dates back to Precambrian. Identifying skeletal structure composition is thus a crucial step in improving our understanding of early evolution metazoans. Here, we present discovery 505–million-year-old chitin, found exceptionally well preserved Vauxia gracilenta sponges from Middle Cambrian Burgess Shale. Our new findings indicate that, given right fossilization conditions, chitin stable for much longer than...
ABSTRACT The different categories of samples and their treatments at the radiocarbon ( 14 C) laboratory in Jena, Germany, are described. Jena C is dedicated to studying global carbon cycle through analysis soil, plant, gas, charcoal, wood samples. respective preparation procedures for types presented, including wet-chemistry pretreatments soil decalcification, charcoal purification using an acid–base–oxidation procedure (ABOx), α-cellulose extraction from leaves. In particular,...
A 7-year-long data set of integrated high-precision 14CO2 observations combined with occasional hourly flask from the Heidelberg sampling site is presented. located in highly populated and industrialized upper Rhine valley southwestern Germany. The are used combination carbon monoxide (CO) to estimate regional fossil fuel CO2 (2;FFCO2) mixing ratios. We investigate three different 14C calibration schemes calculate2;FFCO2: (1) long-term median2;CO/2;FFCO2 ratio 14.6 ppb ppm1 (mean: 15.5 ± 5.6...
Abstract. Long-term and high-precision measurements of the mole fraction greenhouse gases (GHG), together with their isotopic composition, are fundamental importance to understand land-atmosphere interactions. Current flask monitoring programs have important information gaps in large regions Earth, particularly southern hemisphere continental tropical regions. Here, we report on initiation a program resulting dataset GHG at Amazon Tall Tower Observatory (ATTO), located central region Brazil....
Warming temperatures are likely to accelerate permafrost thaw in the Arctic, potentially leading release of old carbon previously stored deep frozen soil layers. Deeper depths combination with geomorphological changes due loss ice structures permafrost, may modify water distribution, creating wetter or drier conditions. Previous studies revealed higher ecosystem respiration rates under conditions, and this study investigated cause increased using radiocarbon signatures respired CO2 from two...
Abstract The decomposition of thawing permafrost organic matter (OM) to the greenhouse gases (GHG) carbon dioxide (CO 2 ) and methane forms a positive feedback global climate change. Data on in situ GHG fluxes from OM are scarce degradability is largely unknown, causing high uncertainties permafrost‐carbon feedback. We combined CO flux measurements at an abrupt thaw feature with laboratory incubations dynamic modeling quantify annual release OM, estimate its evaluate explanatory power...
The new accelerator mass spectrometry (AMS) Radiocarbon Analysis Laboratory in Jena is described. laboratory developed a combustion system for solid samples and CO 2 extraction air samples. Thus far, sample preparation, including graphitization, was performed the laboratory, were measured subsequently by other AMS facilities. Currently, owns 3MV from HVEE (Netherlands) that has passed acceptance tests will be used routine 14 C determinations near future. equipped with ion sources, one...
Soils represent the largest carbon pool in terrestrial biosphere, and climate change might affect main fluxes associated with this pool. These are production of aboveground litter root litter, decomposition soil organic matter (SOM) by microorganisms. Knowledge about temperature sensitivity different SOM fractions is crucial order to understand how storage soils. In study, turnover times three (labile, intermediate, stabilized) was investigated for 11 forest sites along a gradient. Carbon-14...
A novel interferometer has been developed with which the complex index of refraction thin self-supporting foils can be measured in vacuum ultraviolet and soft x-ray region. It consists two collinear undulators a grating spectrometer. Taking advantage low emittance 855 MeV electron beam from Mainz Microtron, distinct intensity oscillations have observed as function distance between undulators. foil placed causes phase shift an attenuation oscillation amplitude. The at $K$-absorption edge carbon.
The Jena Analysis Code (JAC) was developed at the radiocarbon laboratory for analysis of all 14C accelerator mass spectrometry (AMS) data measured there. fundamental principles and algorithms JAC are presented here, along with equally important checking procedures. places emphasis on uncertainty due to background subtraction other contributions statistical events.
The Jena Analysis Code (JAC) was developed at the radiocarbon laboratory for analysis of all 14 C accelerator mass spectrometry (AMS) data measured there. fundamental principles and algorithms JAC are presented here, along with equally important checking procedures. places emphasis on uncertainty due to background subtraction other contributions statistical events.
Experimental results of beam tests with a novel superconductive in-vacuum mini-undulator test device are described. The period length is 3.8 mm and the undulator 100 periods long. gap height can be varied between 1 2 mm. were performed an 855 MeV electron at Mainz Microtron MAMI. small has been operated up to current 50 /spl mu/A cw. bremsstrahlung background almost negligible does not influence superconductor. In this paper measured X-ray spectra presented.
Elites played a pivotal role in the formation of post-Roman Europe on both macro- and microlevels during Early Medieval period. History archaeology have long focused their description identification based written sources or through archaeological record. We provide different perspective this topic by integrating paleogenomic, archaeological, isotopic data to gain insights into one such elite group Langobard period community near Collegno, Italy dated 6-8th centuries CE. Our analysis 28 newly...