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  • Weitere Quellen  (2.336)
  • Springer  (2.332)
  • American Institute of Physics (AIP)
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  • 1
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    100 Years Geologische Vereinigung and Geologische Rundschau (2010)
    Springer
    In:  International Journal of Earth Sciences, 99 (Suppl. 1). S1-S2.
    Details
    Publikationsdatum: 2018-06-01
    Materialart: Article , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OCEANREP)
  • 2
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    10th European workshop on laser ablation : editorial (2011)
    Springer
    In:  Analytical and Bioanalytical Chemistry, 399 (6). pp. 2149-2151.
    Details
    Publikationsdatum: 2019-09-23
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OCEANREP)
  • 3
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    13C isotope depletion in ikaite crystals: evidence for methane release from the Siberian shelves? (1997)
    Springer
    In:  Geo-Marine Letters, 17 . pp. 169-174.
    Details
    Publikationsdatum: 2017-05-22
    Beschreibung: Ikaite crystals (CaCO3×6H2O) have been found at 232- to 238-cm sediment depth in R/V Polarstern core PS2460-4 from the Laptev Sea continental margin in a water depth of 204 m. δ13C values of this phase average −36.3±0.4‰ PDB (N=2), which is significantly outside the range of normal marine carbonates. The CO2 involved in the precipitation of the ikaite is most probably derived from methane, which has extremely depleted 13C isotope values. Two possible sources of methane in these sediments are: (1) methanogenesis (decomposition of organic matter under anaerobic conditions); and (2) gas hydrates, which are known to occur in the Siberian shelf regions.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    25 seconds for Bucharest (2003)
    Springer
    In:  Professional Paper, Open-File Rept., Early Warning Systems for Natural Disaster Reduction, Berlin, Springer, vol. 1, no. 16, pp. 471-477, (ISBN 0080419208)
    Details
    Publikationsdatum: 2003
    Schlagwort(e): Early warning systems (earthquakes, volcanic eruptions, tsunamis etc.) ; Romania ; Seismology ; Seismicity ; Earthquake engineering, engineering seismology ; Karlsruhe ; Kueppers ; Kuppers ; SFB ; 461
    Standort Signatur Erwartet Verfügbarkeit
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
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    3-D Adaptive Finite-Element Modeling of Marine Controlled-Source Electromagnetics with Seafloor Topography Based on Secondary Potentials (2018)
    Springer
    In:  Pure and Applied Geophysics, 175 (12). pp. 4449-4463.
    Details
    Publikationsdatum: 2021-02-08
    Beschreibung: We present a solution of using adaptive nodal finite-element (FE) method to solve the marine controlled-source electromagnetic (CSEM) problem for 3-D earth models in the frequency domain. The forward problem is solved based on the secondary Coulomb-gauged electromagnetic (EM) potentials. We implement an adaptive mesh refinement algorithm according to an a posteriori error estimator based on a gradient-recovery operator of the secondary EM potentials. To increase the quality of the mesh at the receiver locations, the elements containing the receiver locations are constrained by assigning them a maximum volume for the initial mesh. An unstructured tetrahedral mesh used in our approach can provide an accurate description of complex structures such as dipping layers and rough topography that are not accurately fitted using structured meshes. We first validate the adaptive FE approach and demonstrate the convergence of the adaptive grid refinement procedure using a 1-D layered model. The canonical disc model example illustrates the capability of the adaptive FE approach for 3-D CSEM modeling. The bathymetry model shows that the algorithm is well suited to deal with complex seafloor topography, which needs to be simulated exactly to avoid the misinterpretation of marine CSEM data sets.
    Materialart: Article , PeerReviewed
    Format: text
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  • 6
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    40Ar/39Ar laser probe age determination confirms the Ries impact crater as the source of glass particles in Graupensand sediments (Grimmelfingen Formation, North Alpine Foreland Basin) (2003)
    Springer
    In:  International Journal of Earth Sciences, 92 (1). pp. 1-6.
    Details
    Publikationsdatum: 2017-05-18
    Beschreibung: Mineralogical and chemical characteristics of reworked suevite material recovered from Graupensand deposits (Grimmelfingen Formation, North Alpine Foreland Basin, Middle Miocene) are identical to those recorded in Ries suevite. 40Ar/39Ar laser probe analyses of two glass particles from Graupensand components and of a glass fragment from the Ries suevite yielded ages ranging between 14.3 and 14.4 Ma, identical within analytical uncertainties. Hitherto, the Ries impact event was dated at 15 Ma (conventional K/Ar and 40Ar/39Ar methods) whereas the Graupensande have been placed into the Ottnangian (around 18.5 Ma), on the basis of mammal biostratigraphy. Small sample masses involved in laser probe technique allowed rigorous preselection of highly pure glass particles, thus reducing possible age determination errors through partly molten (or even unmolten) mineral fragments from the Variscan crystalline basement. Our results reconfirm previous statements considering the Graupensande as reworked products of the Ries impact ejecta blanket, thus placing the age of the Grimmelfingen Formation into the Badenian (of Middle Miocene) rather than into the Ottnangian (Early Miocene).
    Materialart: Article , PeerReviewed
    Format: text
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    ARTIKEL (OCEANREP)
  • 7
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    4D seismic time-lapse monitoring of an active cold vent, northern Cascadia margin (2007)
    Springer
    In:  Marine Geophysical Researches, 28 (4). pp. 355-371.
    Details
    Publikationsdatum: 2015-11-18
    Beschreibung: Two single-channel seismic (SCS) data sets collected in 2000 and 2005 were used for a four-dimensional (4D) time-lapse analysis of an active cold vent (Bullseye Vent). The data set acquired in 2000 serves as a reference in the applied processing sequence. The 4D processing sequence utilizes time- and phase-matching, gain adjustments and shaping filters to transform the 2005 data set so that it is most comparable to the conditions under which the 2000 data were acquired. The cold vent is characterized by seismic blanking, which is a result of the presence of gas hydrate in the subsurface either within coarser-grained turbidite sands or in fractures, as well as free gas trapped in these fracture systems. The area of blanking was defined using the seismic attributes instantaneous amplitude and similarity. Several areas were identified where blanking was reduced in 2005 relative to 2000. But most of the centre of Bullseye Vent and the area around it were seen to be characterized by intensified blanking in 2005. Tracing these areas of intensified blanking through the three-dimensional (3D) seismic volume defined several apparent new flow pathways that were not seen in the 2000 data, which are interpreted as newly generated fractures/faults for upward fluid migration. Intensified blanking is interpreted as a result of new formation of gas hydrate in the subsurface along new fracture pathways. Areas with reduced blanking may be zones where formerly plugged fractures that had trapped some free gas may have been opened and free gas was liberated.
    Materialart: Article , PeerReviewed
    Format: text
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  • 8
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    A 190-ka biomarker record revealing interactions between sea ice, Atlantic Water inflow and ice sheet activity in eastern Fram Strait (2018)
    Springer
    In:  Arktos, 4 (Article 22).
    Details
    Publikationsdatum: 2021-02-08
    Beschreibung: The northeastern Fram Strait at the entrance to the Arctic Ocean represents a key observatory for sea ice reconstructions as it sensitively reacts to environmental changes. A combined biomarker approach (HBIs, sterols, alkenones) was carried out on Core PS93/006-1 from the western Svalbard margin to reconstruct sea ice conditions related to glacial–interglacial cycles of the last 190 ka. The continuous presence of sea ice demonstrates the strong influence of polar water masses in the eastern Fram Strait. Glacial intervals are characterised by extended sea ice conditions with perennial sea ice cover during early MIS 6, the Penultimate Glacial Maximum, the interstadial MIS 5d, MIS 4 and the Last Glacial Maximum. Less severe, yet highly variable, sea ice conditions with more frequent summer melt dominated the interglacial stages. The opposing sea ice conditions along the western and northern Svalbard margin highlight the different regional impact of various environmental forces in eastern Fram Strait. Thus, the major expansion of the Svalbard Barents Sea Ice Sheet favoured the formation of perennial sea ice west of Svalbard while it triggered the establishment of marginal ice cover on the Yermak Plateau.
    Materialart: Article , PeerReviewed
    Format: text
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  • 9
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    A 200-year coral stable isotope record from a high latitude reef of Western Australia (1999)
    Springer
    Details
    Publikationsdatum: 2022-03-10
    Beschreibung: A core from a coral colony of Porites lutea was analysed for stable oxygen isotopic composition*. A 200-year proxy record of sea surface temperatures from the Houtman Abrolhos Islands off west Australia was obtained from coral δ18O. At 29′S, the Houtman Abrolhos are the southernmost major reef complex of the Indian Ocean. They are located on the path of the Leeuwin Current, a southward flow of warm, tropical water, which is coupled to Indonesian throughflow. Coral δ18O primarily reflects local oceanographic and climatic variability, which is largely determined by spatial variability of the Leeuwin Current. However, coherence between coral δ18O and the current strength itself is relatively weak. Evolutionary spectral and singular spectrum analyses of coral δ18O demonstrate a high variability in spectral composition through time. Oscillations in the 5–7-y, 14–15-y, and quasi-biennial bands reflect teleconnections of local sea surface temperature (SST) to tropical Pacific climate variability. Deviations between local (coral-based) and regional (instrument) SST contain a cyclic component with a period of 15 y. Coral δ18O suggests a rise in SST by 0.6 ′C since AD 1944, consistent with available instrumental SST records. A long-term warming by 1.4 ′C since AD 1795 is inferred from the coral record
    Materialart: Article , PeerReviewed
    Format: text
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  • 10
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    A barcode of life database for the Cephalopoda? Considerations and concerns (2007)
    Springer
    In:  Reviews in Fish Biology and Fisheries, 17 (2-3). pp. 337-344.
    Details
    Publikationsdatum: 2021-08-23
    Beschreibung: The concept of a Barcode of Life Database (BoLD) for the Class Cephalopoda (Phylum Mollusca) was introduced at the Cephalopod International Advisory Council (CIAC) symposium in Hobart, Australia, February 2006. This suggestion was met with significant interest, concern and debate. This review attempts to describe the concept of the BoLD initiative and to outline considerations and concerns specific to a cephalopod BoLD.
    Materialart: Article , PeerReviewed
    Format: text
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