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  • Articles  (54)
  • English  (54)
  • 2020-2024  (48)
  • 2020-2022  (2)
  • 2010-2014  (4)
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  • English  (54)
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  • 1
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    Transport (2014)
    Cambridge : Cambridge Univ. Press
    Details
    Publication Date: 2018-11-19
    Keywords: ddc:380
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: bookpart , doc-type:bookPart
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  • 2
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    Preliminary X-ray Absorption Spectroscopy study of synthetic nanokuramite, Cu3SnS4 (2011)
    In:  Abstracts
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    IODP Expedition 329: Life and Habitability Beneath the Seafloor of the South Pacific Gyre (2013)
    In:  Scientific drilling : reports on deep earth sampling and monitoring
    Details
    Publication Date: 2020-02-12
    Description: Integrated Ocean Drilling Program (IODP) Expedition 329 made major strides toward fulfilling its objectives. Shipboard studies documented (1) fundamental aspects of habitability and life in this very low activity subseafloor sedi- mentary ecosystem and (2) first-order patterns of habit- ability within the igneous basement. A broad range of post- expedition studies will complete the expedition objectives. Throughout the South Pacific Gyre (SPG; Sites U1365– U1370), dissolved oxygen and nitrate are present throughout the entire sediment sequence, and sedimentary microbial cell counts are lower than at all previously drilled IODP/ Ocean Drilling Program (ODP)/Deep Sea Drilling Program (DSDP) sites. In contrast, at Site U1371 in the upwelling zone just south of the gyre, detectable oxygen and nitrate are limited to the top and bottom of the sediment column, man- ganese reduction is a prominent electron-accepting process, and cell concentrations are higher than at the same depths in the SPG sites throughout the sediment column. Geographic variation in subseafloor profiles of dissolved and solid-phase chemicals are consistent with the magnitude of organic-fueled subseafloor respiration declining from out- side the gyre to the gyre center. Chemical profiles in the sedimentary pore water and secondary mineral distributions in the basaltic basement indicate that basement alteration continues on the timescale of formation fluid replacement, even at the sites with the oldest basement (84–120 Ma at Sites U1365 and U1366).
    Language: English
    Type: info:eu-repo/semantics/article
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  • 4
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    Geometric primitive extraction for 3D reconstruction of urban areas from tomographic SAR data (2013)
    In:  Proceedings
    Details
    Publication Date: 2020-11-11
    Description: In this paper we propose a method that performs an automatic extraction of geometric primitives from tomographic SAR data. This technique allows to identify surfaces by assuming they can be locally described by a piecewise planar model. It is therefore suitable to reconstruct man-made structures in urban areas. Our approach takes advantage of the spatial connectivity of points from tomographic height maps in order to retrieve planar patches from noise corrupted point clouds. We demonstrate how our method outperforms the well-known RANSAC algorithm over synthetic and experimental data.
    Language: English
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  • 5
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    Reconnaissance magnetotelluric measurements in northern Bavaria (2020)
    GFZ Data Services
    Details
    Publication Date: 2020-03-19
    Description: Assess of the feasibility of magnetotelluric measurements for geothermal exploration in northern Bavaria despite of the high level of cultural electromagnetic noise. This data publication encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 6
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    Can an impulsive variation of the solar wind plasma pressure trigger a plasma bubble? A case study based on CSES, SWARM and THEMIS data. (2021)
    In:  Advances in Space Research
    Details
    Publication Date: 2021-01-22
    Description: During the August 25, 2018 geomagnetic storm, the new borne CSES-01 satellite and the Swarm A satellite detected a really large equatorial plasma bubble (EPB) in the post-midnight sector over western Africa. We investigated the features of this deep ionospheric plasma depletion using data from the Langmuir probes on-board CSES-01 and Swarm A satellites, and data from the high-precision magnetometer and the electric field detector instruments on-board CSES-01. Using also plasma and magnetic field data from THEMIS-E satellite we found that, during the passage of the magnetic cloud that drove the geomagnetic storm, an impulsive variation lasting about ten minutes characterized the solar wind (SW) pressure. The analysis of the delay time, between the occurrence of such impulsive variation and the detection of the plasma bubble, suggests a possible link between the SW pressure impulsive variation as identified by THEMIS-E and the generation of the EPB as detected by CSES-01 and Swarm A. We put forward the hypothesis that the SW pressure impulsive variation might have triggered an eastward prompt penetrating electric field that propagated from high to equatorial latitudes, overlapping in the nightside region to the zonal westward electric field, causing either a reduction or an inversion, at the base of the EPB triggering.
    Language: English
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  • 7
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    Detecting electrostatic activity of oxygen ions in the topside ionosphere using electric field measurements in the VLF band (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-14
    Description: We investigate the spectral properties of the ionospheric electric field during a period of high geomagnetic activity, namely on August 11 2018 from 21:40 to 22:17. The purpose is to detect possible signatures of the characteristic frequencies of the ions populating the ionosphere. In particular, we exploit measurements taken in the VLF band by the Electric Field Detector (EFD) onboard the Chinese Seismo-Electromagnetic Satellite - 01 (CSES-01) spacecraft, orbiting at around 500km of altitude in a sun-synchronous orbit. In the temporal interval considered, a clear peak in the frequencies between 2.5 kHz and 5 kHz, with a well defined latitudinal pattern, is observed in the power spectral density of the electric field at equatorial latitudes between two density drops, consistent with the presence of two plasma bubbles. Such a pattern perfectly matches the latitudinal pattern of the O+ plasma frequency as calculated by density measurements taken concurrently by another CSES-01 payload, the Plasma Analyzer Package (PAP) suite. We discuss possible interpretations of the presence of this signature in terms of O+ electrostatic perturbations generated by the ionospheric dynamics during geomagnetically active periods.
    Language: English
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  • 8
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    Ambient noise tomography of El Hierro island (Canary Islands) (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-05-22
    Description: To better understand the shallow structure of El Hierro island, we determined a 3D S-wave velocity model using Ambient Noise Tomography (ANT). We exploited a dataset recorded by 21 broadband seismic stations deployed at El Hierro island in two surveys realized in 2015 and 2021. This dataset allowed us to obtain empirical Green’s functions by cross-correlating seismic ambient noise signals and retrieving 105 dispersion curves using the frequency-time analysis (FTAN). Then we obtained 2-D Rayleigh wave group velocity maps for periods between 0.6 s and 2.6 s through a non-linear multiscale inversion (Cabrera-Pérez et al, 2021). Finally, we performed depth inversion through a Bayesian transdimensional approach to obtain a 3-D S-wave velocity model. The obtained ANT model is merged with a local earthquake tomography model (García-Yeguas et al, 2014). Our study highlights six relevant seismic velocity anomalies. We observed the presence of three high-velocity zones located in the eastern, western and northern parts of the island, which could be related to intrusive bodies possibly associated with the formation of El Hierro island. We also observed three low-velocity anomalies in the northern and southern parts. The anomaly in the North of the island could be related to loose deposits generated by the El Golfo valley megalandslide. The anomalies in the South could be related to porous and highly fractured materials produced during the more recent volcanic episodes.
    Language: English
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  • 9
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    Can Plate Bending Explain the Observed Faster Landward Motion of Lateral Regions of the Subduction Zone After Major Megathrust Earthquakes? (2023)
    In:  Journal of Geophysical Research: Solid Earth
    Details
    Publication Date: 2023-05-22
    Description: Greater landward velocities were recorded after six megathrust earthquakes in subduction zone regions adjacent to the ruptured portion. Previous explanations invoked either increased slip deficit accumulation or plate bending during postseismic relaxation, with different implications for seismic hazard. We investigate whether bending can be expected to reproduce this observed enhanced landward motion (ELM). We use 3D quasi-dynamic finite element models with periodic earthquakes. We find that afterslip downdip of the brittle megathrust exclusively produces enhanced trenchward surface motion in the overriding plate. Viscous relaxation produces ELM when a depth limit is imposed on afterslip. This landward motion results primarily from in-plane elastic bending of the overriding plate due to trenchward viscous flow in the mantle wedge near the rupture. Modeled ELM is, however, incompatible with the observations, which are an order of magnitude greater and last longer after the earthquake. This conclusion does not significantly change when varying mantle viscosity, plate elasticity, maximum afterslip depth, earthquake size, megathrust locking outside of the rupture, or nature and location of relevant model boundaries. The observed ELM consequently appears to reflect faster slip deficit accumulation, implying a greater seismic hazard in lateral segments of the subduction zone.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 10
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    Tropical precipitation response to stratospheric volcanic forcing: A large ensemble approach (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-05-19
    Description: Sufficient large-ensemble simulations with the same model and radiative forcing scenario but varying initial conditions have become a great tool in recent years to disentangle forced and internal variability. Here we use 100-member ensembles of the MPI-ESM-LR for idealized volcanic eruptions of different eruption strength and latitude to investigate whether there is a linear volcanic signal on tropical precipitation dependent on the eruption strength, and when does it emerge from tropical internal variability. Our results show that for idealized tropical eruptions global and large hemispheric mean precipitation anomalies seemed to be scalable with the sulfur emission strength in a certain size range. An emission of 10 Tg sulfur seems to be a threshold where the volcanic signal is discernible from internal variability. We find that seasonal and ensemble mean pattern correlation of precipitation anomalies are highly correlated, in particular for larger emission strengths in the tropics and strongly modulated by ENSO with an increasing tendency for a warm ENSO increase with eruption strength. While the emergence of cooling appears on a hemispheric scale, the precipitation response is more localized and mainly confined to the tropics and subtropics. In line with previous findings our modelling results suggesting that large NH extratropical volcanic eruptions migrate the ITCZ to the south, whereas SH extratropical eruptions move the ITCZ to the north. Large regional differences depend on how the local Hadley circulation responds to the volcanic forcing.
    Language: English
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