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Now showing items 4924-4943 of 5519
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(U-Th)/He thermochronology — methodology and a case study: dating of faulting in the Southern Alps
; Dani˘sík, Martin; Picotti, Vincenzo; Frisch, Wolfgang; Eynatten, Hilmar von; Castellarin, Alberto (11. Symposium "Tektonik, Struktur- und Kristallingeologie", 2006-03)
The radiogeic 4He isotope is continuously forming in the lithosphere mainly by the alpha-decay of U, Th and Sm. This decay process was discovered already at the beginning of the 20th century, and the first U/He dating ... -
Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences
; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2020-05-11)
The mineralogy, chemical composition, and physical properties of cratonic mantle eclogites with oceanic crustal protoliths can be modified by secondary processes involving interaction with fluids and melts, generated in ... -
Un tuf volcanique semblable à l'Eltviller Tuff dans les loess de Hesbaye (Belgique) et du Limbourg néerlandais
(E&G – Quaternary Science Journal; Vol.31, No. 1)Ein vulkanischer Tuff ist in drei Lößprofilen von Ostbelgien (Rocourt und Lixhe) und niederländisch Limburg gefunden worden. Dieser Tuff kann mit dem Eltviller Tuff (Semmel 1967) korreliert werden. Daher können die Lößprofile ... -
Uncertainties in Kelvin Waves in ECMWF Analyses and Forecasts: Insights From Aeolus Observing System Experiments
; ; (Geophysical Research Letters, 2021-11-16)
The European Space Agency Earth Explorer mission Aeolus with the first spaceborne Doppler Wind Lidar onboard provides global coverage of wind profiles twice per day. This paper discusses the impact of assimilating Aeolus ... -
Uncertainty in Aerosol Optical Depth From Modern Aerosol‐Climate Models, Reanalyses, and Satellite Products
; ; ; ; ; ; (Journal of Geophysical Research: Atmospheres, 2022-01-18)
Despite the implication of aerosols for the radiation budget, there are persistent differences in data for the aerosol optical depth (τ) for 1998–2019. This study presents a comprehensive evaluation of the large‐scale ... -
Understanding Forest Health with Remote Sensing - Part I - A Review of Spectral Traits, Processes and Remote-Sensing Characteristics
(Remote Sensing, 2016)Anthropogenic stress and disturbance of forest ecosystems (FES) has been increasing at all scales from local to global. In rapidly changing environments, in-situ terrestrial FES monitoring approaches have made tremendous ... -
Understanding Forest Health with Remote Sensing-Part II—A Review of Approaches and Data Models
(Remote Sensing, 2017)Stress in forest ecosystems (FES) occurs as a result of land-use intensification, disturbances, resource limitations or unsustainable management, causing changes in forest health (FH) at various scales from the local to ... -
Understanding the Extreme Spread in Climate Sensitivity within the Radiative-Convective Equilibrium Model Intercomparison Project
; (Journal of Advances in Modeling Earth Systems, 2020)
The Radiative-Convective Equilibrium Model Intercomparison Project (RCEMIP) consists of simulations at three fixed sea-surface temperatures (SSTs: 295, 300, and 305 K) and thus allows for a calculation of the climate ... -
Understanding the geobiology of the terminal Ediacaran Khatyspyt Lagerstätte (Arctic Siberia, Russia)
; Love, Gordon D.; Rogov, Vladimir I.; Melnik, Dmitry S.; Blumenberg, Martin; Grazhdankin, Dmitriy V. (Geobiology, 2020)
The Khatyspyt Lagerstätte (~544 Ma, Russia) provides a valuable window into late Ediacaran Avalon-type ecosystems with rangeomorphs, arboreomorphs, and mega-algae. Here, we tackle the geobiology of this Lagerstätte by the ... -
Ungewöhnliche Probleme bei der 14C-Datierung organischer Komponenten und Fraktionen fluviatiler Sedimente aus der Aue der Weißen Elster bei Leipzig
(E&G – Quaternary Science Journal; Vol.52, No. 1)Aus Paläorinnensedimenten und fossilen Bodenhorizonten in der Weißen Elsteraue wurden konventionelle und AMS 14C-Altersbestimmungen der organischen Substanz durchgeführt. Die Ergebnisse liefern z.T. sehr große Altersdifferenzen ... -
Unmanned aerial vehicle-based mapping of turf-banked solifluction lobe movement and its relation to material, geomorphometric, thermal and vegetation properties
; ; ; ; ; ; (Permafrost and Periglacial Processes, 2020)
Solifluction is one of the most widespread periglacial processes with low annual movement rates in the range of —millimeters to centimeters. Traditional methods to assess solifluction movement usually have low spatial ... -
Unraveling the Global Warming Mitigation Potential from Recycling Subway‐Related Excavated Soil and Rock in China Via Life Cycle Assessment
(Integrated Environmental Assessment and Management, 2021-02-18)Many cities across China are investing in subway projects, resulting in much subway construction activity, which has experienced a surge over the past decade. The construction activities inevitably cause a dramatic quantity ... -
Unravelling the crystal structure of Nd5.8WO12−δ and Nd5.7W0.75Mo0.25O12−δ mixed ionic electronic conductors
(Journal of Applied Crystallography, 2020-10-25)Mixed ionic electronic conducting ceramics Nd6−yWO12−δ (δ is the oxygen deficiency) provide excellent stability in harsh environments containing strongly reactive gases such as CO2, CO, H2, H2O or H2S. Due to this chemical ... -
Unsichere physikalische Größen von Torf
(TELMA - Berichte der Deutschen Gesellschaft für Moor- und Torfkunde; Band 39; 2009)Abstract: Physical characteristics of peat are described according to mineral soils and deposits of raw material. I show, that the features of plants (and their residues) determine physical parameters and their interpretation ... -
Unsteady thermal convection in the North-East German Basin
(WIAS, Berlin2002)We describe a Voronoi box based finite volume method for the numerical simulation of thermal convection in sedimental basins. The method shows a temperature maximum principle and consistent velocity approximation. We present ... -
Unsupervised biodiversity estimation using proteomic fingerprints from MALDI-TOF MS data†
; (Limnology and Oceanography: Methods, 2020)
Species identification using matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) data strongly relies on reference libraries to differentiate species. Because comprehensive reference ... -
Untere Mittelterrasse und Krefelder Mittelterrasse im Südteil der Niederrheinischen Bucht
(E&G – Quaternary Science Journal; Vol.21, No. 1)Eine Revision der im Südteil der Niederrheinischen Bucht üblichen Gliederung der jüngeren Mittelterrassen in Untere Mittelterrasse (UMT) und Krefelder Mittelterrasse (KMT) ergab: Der morphologisch deutlichen Zweiteilung ... -
Unterkambrischer Sandstein mit kegelförmigen organischen Strukturen des Conichnus-Typs – ein Fundbericht
(Neubrandenburger Geologische Beiträge; Vol.12)Es wird ein unterkambrisches Sandsteingeschiebe von Rügen mit 14 kegelförmigen Strukturen vom Conichnus-Typ in Vergesellschaftung mit dem Spurenfossil Monocraterion vorgestellt. -
Untermoräne – Grundmoräne – Grundmoränenlandschaft
(E&G – Quaternary Science Journal; Vol.25, No. 1)Zunehmende Dicke des Inlandeises mindert die Mächtigkeit der Grundmoräne. Bei deren Abtrag entstehen Geschiebepflaster (striated pavement). Sie werden bei erneuter Minderung der Eisdecke von sich abermals niederschlagender ...