A5008664951- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Pleistocene-Era Hominins and Archaeology
- Atmospheric and Environmental Gas Dynamics
- Geological formations and processes
- Nuclear Physics and Applications
- Methane Hydrates and Related Phenomena
- Landslides and related hazards
- CO2 Sequestration and Geologic Interactions
- Boron Compounds in Chemistry
- Concrete Corrosion and Durability
- Groundwater and Isotope Geochemistry
- Electrostatic Discharge in Electronics
- X-ray Spectroscopy and Fluorescence Analysis
- Radioactivity and Radon Measurements
- Concrete and Cement Materials Research
- Nuclear reactor physics and engineering
- Radioactive contamination and transfer
- Ion-surface interactions and analysis
- Non-Destructive Testing Techniques
- Astro and Planetary Science
- Geological Modeling and Analysis
- Radioactive element chemistry and processing
- Archaeology and ancient environmental studies
- Atmospheric Ozone and Climate
ETH Zurich
2021-2025
École Polytechnique Fédérale de Lausanne
2022
Abstract During solar storms, the Sun expels large amounts of energetic particles (SEP) that can react with Earth’s atmospheric constituents and produce cosmogenic radionuclides such as 14 C, 10 Be 36 Cl. Here we present Cl data measured in ice cores from Greenland Antarctica. The consistently show one largest production peaks detected so far, most likely produced by an extreme SEP event hit Earth 9125 years BP (before present, i.e., before 1950 CE), 7176 BCE. Using Cl/ ratio, demonstrate...
Abstract. Radiocarbon (14C) is an optimal tracer of methane emissions, as 14C measurements enable distinguishing between fossil and biogenic (CH4). However, in atmospheric are still rare, mainly because the technical challenge collecting enough carbon for analysis from ambient air samples. In this study, we address by advancing system Zazzeri et al. (2021) into a much more compact portable sampler coupling with MICADAS (MIni CArbon DAting System) accelerator mass spectrometry (AMS) at ETH...
Abstract Deckenschotter are glaciofluvial gravels that cap isolated bedrock plateaus and largely disconnected from today's local drainage. They were deposited when glaciers the Alps first extensive enough to reach northern Swiss foreland, thus providing a unique record of foreland landscape its evolution during earliest Quaternary glaciations. To decipher this record, we employ two robust methodologies: cosmogenic 26 Al/ 10 Be burial dating GIS‐based topographic analysis. ages both new...
Cosmogenic nuclide concentrations are typically inverted for erosion and soil production rates under the assumption that these temporally invariant, thickness is in steady state. Yet, transience process expected to occur landscapes experiencing changes land use, tectonic uplift, climate. Pairing cosmogenic nuclides with different half-lives provides a means resolving if sufficiently slow radioactive decay significant. Here, we examine 10Be 26Al quartz collected from saprolite at 6 positions...
The Northern Apennines are an active orogenic wedge formed by subduction and rollback of the Adriatic plate over last 30 Ma, where horizontal shortening topographic advection lead to river capture drainage divide migration. orogen exhibits asymmetry across main divide: side is steeper than Ligurian side, suggesting migration towards Adriatic, opposite direction tectonic topography. In this study, we present new catchment-averaged denudation rates from major basins in derived cosmogenic 10Be...
We introduce a novel high-precision method for oxygen-isotope analysis of iron (oxyhydr)oxides using high-temperature conversion isotope ratio mass spectrometry (HTC-IRMS). In this approach, finely ground mixture (oxyhydr)oxide and graphite is heated at 1450 °C in helium flow environment, converting oxygen to CO gas with nearly 100% yield. Continuous-flow IRMS the liberated yields precision ±0.15‰ (1σ, n = 28) shows excellent agreement (and improved over) traditional fluorination methods....
Abstract. Dating the bottommost section of an ice core is often complicated by strong layer thinning and possible disturbances in stratigraphy. The radioactive decay atmospherically produced 36Cl 10Be can provide age estimates, where traditional methods no longer be used. In this study, we investigated from bottom Skytrain core, which was drilled West Antarctica next to Ronne Ice Shelf has previously been dated 126 kyr BP about 24 m above bedrock. Apart decay, radionuclide concentrations...
Previous research suggested that the Alpine glaciers of Northern Swiss Foreland reached their maximum extensive position during Middle Pleistocene. Relict tills and glaciofluvial deposits, attributed to Most Extensive Glaciation (MEG), have been found only beyond extents Last Glacial Maximum (LGM). Traditionally, these sediments correlated Riss glaciation sensu Penck Brückner morphostratigraphically classified as Higher Terrace (HT) deposits. The age MEG was originally proposed be...
Abstract Cut-and-fill sequences are the result of climatically or tectonically induced alternating aggradation and incision phases a fluvial system. A recently established cosmogenic nuclide chronology Cover Gravels ( Deckenschotter in German) northern Alpine Foreland, which oldest Quaternary glaciofluvial gravels comprise evidence early Pleistocene glaciations, suggests cut-and-fill build-up. This suggested architecture challenges morphostratigraphy. The deposits represent suitable archive...
Compact, low energy accelerator mass spectrometry (AMS) has evolved over the past years as one of most sensitive, selective, and robust techniques for analysis heavy long lived radionuclides. In this study, we focus on analytical capabilities compact AMS system MILEA, mainly 236U analyses. First, setup actinide analyses is presented special technical 23xU/238U (x = 3, 6, 5) discussed. Then, background sensitivity 236U/238U are studied in detail, finally results from first routine runs Our...
Ice cores are excellent archives for obtaining long and continuous 10Be records. However, traditional ice core measurements required a lot of (0.5–1kg) often needed to be connected large costly project. These reasons have been the factors limiting number variety projects data. In this paper, we show on small samples (∼45g) auger chips from borehole at Little Dome C (LDC), East Antarctica. The sample preparation method accelerator mass spectrometry (AMS) was tested optimized using test (∼50g)...
ABSTRACT 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 precision performance of better than 1‰ for modern 14 C. The main difference between these two systems the acceleration voltage, been reduced from 200 kV to 50 system. In order execute final tests, exactly same samples (2 sets consisting 7 standards, 4 blanks, 26 wood samples) are measured on both successively. results...
Abstract This work exhibits the very first experimentally determined cross sections for 26 Al and 41 Ca as proton-induced spallation products of metallic vanadium targets. Additionally, authors describe a radiochemical separation from matrix present theoretically calculated cross-section values reference experimental ones.
Soil CO2 efflux is one of the largest C fluxes between terrestrial ecosystems and atmosphere originates from different sources such as rhizosphere respiration mineralization various soil organic matter components. Alterations induced by environmental changes, climate land use change, can thus affect atmospheric levels. Land regulates their source contributions through factors vegetation type, root density, nutrient input, management. types are likely to vary in susceptibility change...
The RICH (Radiocarbon Inventories of Switzerland) project aims to build the first database and model distribution cycling 14C at a national scale across atmosphere, soils, rivers lakes C pools. subproject presented here (RICH-Air) will serve construct complementary monitoring snapshots approaches atmospheric 14CO2 measurement in this larger scope. Radiocarbon measurements CO2 provide unique information on its sources subsequent transport. It allows apportionment between biogenic fossil...
Perturbations to the natural carbon cycle due anthropogenic and induced emissions of dioxide (CO2) into atmosphere are strongly linked with current trend global climate change. Efforts aiming at measuring amounts CO2 emitted by different ecosystems industrial activities have been increasing in past years, order gather information about necessary mitigations efforts towards reduced future emissions.Radiocarbon (14C) measurements atmospheric unique their capabilities provide on sources...
Radiocarbon (14C) measurements of atmospheric greenhouse gases such as carbon dioxide (CO2) and methane (CH4) are central in our capability to identify their provenance. The 14C content these provides more insight into the age sources mainly allows distinction between fossil modern ones. 14CO2 can be used analyze nature anthropogenic emissions (mostly fossil), or discern on what organic matter pool respiration is taking place a given environment. 14CH4 also detect (from leaks natural gas,...
Measurements of radiocarbon (14C) in atmospheric methane (CH4) provide a powerful tool to distinguish fossil from biogenic emissions, because is completely devoid 14C. However, these measurements are particularly challenging as CH4 at low concentration the atmosphere and large volumes air must be sampled.At Laboratory Ion Beam Physics (LIP), ETH, we developed portable sampler based on laboratory prototype Zazzeri et al. 2021 [1]. The new system enables extraction carbon while sampling field,...
<p><sup>10</sup>Be concentrations measured from ice cores are key records for the reconstruction of long-term changes in solar activity and geomagnetic field intensity. Furthermore, <sup>10</sup>Be have additional applications dating via global cosmic ray signal, studies snow accumulation rates atmospheric transport deposition. Here, we present a new record chips recovered austral summer 2017/2018 Little Dome C, close to...
<p>Deckenschotter (Cover Gravels in German) are Quaternary glacio-fluvial gravels, which unconformably overlie Tertiary Molasse or Mesozoic bedrock the Northern Alpine Foreland. They comprise also evidence of Early Pleistocene glaciations. A significant phase incision separated them into Höhere Deckenschotter (HDS: Higher Cover Gravels) and Tiefere (TDS: Lower based on their topography. How landscape evolved during times is still not fully understood. The new...