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  • 2020-2024  (36,679)
  • 2010-2014  (21)
  • 2023  (36,679)
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  • 1
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    Introduction of GFZ and Department 1 Geodesy (2023)
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    Publication Date: 2024-05-22
    Language: English
    Type: info:eu-repo/semantics/other
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  • 2
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    Arbeiten von Friedrich Robert Helmert und ihr Einfluss auf die moderne Geodäsie (2023)
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    Publication Date: 2024-05-22
    Language: German
    Type: info:eu-repo/semantics/lecture
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  • 3
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    Responses of the subsurface thermal field to the paleoclimate history in Germany (2023)
    In:  Abstracts
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    Publication Date: 2024-05-22
    Type: info:eu-repo/semantics/other
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  • 4
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    Exploring Ambient Seismic Noise Methods applied to Dark Fiber DAS for Probing the Urban Subsurface (2023)
    In:  Abstracts
    Details
    Publication Date: 2024-05-22
    Description: The application of ambient seismic noise tomography to continuous dynamic strain data recorded along existing fiber-optic cables using Distributed Acoustic Sensing (DAS) is emerging as a promising approach for cost-efficient, regional-scale (10’s of km) subsurface imaging and monitoring at high spatial (~1 m) and temporal resolution in a variety of environments. Ambient noise dispersion-based methods have gained significant attention in recent years, and they have been successfully applied to retrieve detailed subsurface velocity models both onshore and offshore. Yet, these methods are limited by the assumption of negligible lateral variations across the array segment analyzed to extract dispersion curves. The length of the segment constrains not only the spatial resolution of the resulting 2D velocity model, but also the maximum depth of investigation. The high density of measurements provided by DAS datasets, however, enables resolving small-scale, lateral velocity variations when analyzed using approaches that are not scale-limited. Here, we investigate the application of alternative ambient seismic noise methods to dynamic strain data recorded along dark fibers in urban areas to constrain shear-wave velocity models obtained using dispersion-based techniques. In particular, we explore the potential of autocorrelation methods (i.e., single-channel cross-correlations) for resolving fine-scale subsurface structure and exploring wave propagation characteristics associated with it. We apply these methods to continuous ambient seismic noise recordings from dark fiber DAS campaigns conducted in Berlin and Potsdam (Germany) to complement seismic exploration activities for urban geothermal projects. Challenges associated with the complexities of the urban seismic noise field and their influence on autocorrelation results will be discussed. For the Potsdam dataset, results will be compared against seismic reflection images obtained from a conventional, controlled-source seismic experiment using geophone arrays whose trajectories followed the dark fiber profile closely. Ultimately, we aim at providing insights into how we can use dark fiber DAS recordings of the ambient seismic noise field to understand the heterogeneity of the urban subsurface.
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Spectral harmonization and red edge prediction of Landsat-8 to Sentinel-2 using land cover optimized multivariate regressors (2023)
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    Publication Date: 2024-05-22
    Type: info:eu-repo/semantics/lecture
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  • 6
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    The IHFC Global Heat Flow Database: New Structure and Evaluation Scheme for the quality-assurance of Heat-Flow Data (2023)
    In:  Abstracts
    Details
    Publication Date: 2024-05-22
    Description: Heat-flow density is a basic parameter required for studying thermal processes of the Earth. Heat-flow data contribute to our understanding of large-scale geodynamic processes such as plate tectonics, the fundamental planetary energy balance, local and regional processes such as neotectonic activity, fluid flow or mineralization, the selection and location of geothermal energy projects, and the geological record of past land surface temperature changes. Since 1963, the International Heat Flow Commission (IHFC) has been fostering the compilation of the Global Heat Flow Database to provide reliable heat-flow data. However, the data stored prevously were often incomplete and did not follow modern database standards. In 2020, the IHFC initiated an international collaboration to review the Global Heat Flow Database (GHFD) and to benefit from new developments in information technology. Therefore, a reorganization of the database structure and a re-assessment of the stored data was started. In the last two years, the standards necessary for collecting, storing, and evaluation of heat flow data were intensively discussed. The result is a new database structure for capturing this important parameter and associated metadata and a systematic quality assessment scheme. The quality scheme, for the first time, combines three independent quality criteria in one combined score, comprising the quantified uncertainty, the methodological quality, and the status of overruling (site) effects. It allows a quick comparison of heat-flow data and reveals missing data or insufficient documentation at one glance. With the new quality scheme, users can select appropriate heat-flow values for their specific scientific purpose. The most recent intermediate update of the GHFDB – the data release 2023 – is the first release that partly considers the new structure. It contains data generated between 1939 and 2022 and comprises 73,033 heat-flow data from 1,414 publications. Because the process to screen and update incomplete, wrong or empty database entries requires to look-up primary publications, this process is ongoing and will last for a couple of years. Finally, the new GHFDB will significantly improve thermal analysis and the modelling of the Earth's temperature field.
    Type: info:eu-repo/semantics/conferenceObject
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  • 7
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    The World Heat Flow Database project: a new research data infrastructure for a community-driven Global Heat Flow Database (2023)
    In:  Abstracts
    Details
    Publication Date: 2024-05-22
    Description: The Global Heat Flow Database (GHFDB) is fostered and maintained by the International Heat Flow Commission (IHFC) for nearly 60 years. During these decades, the technological database concepts and storing capabilities evolved, allowing to add entries in the heat-flow database and underlying scientific methods according to the state of the art and database technology. In 2019, a collaborative database revision process started to provide a quality-assured and authenticated database. The community-driven approach, called the Global Heat Flow Data Assessment Project, started with a discussion of a new database structure to substitute the former database structure from 1976. It was designed to scrutinize and reassess the stored heat flow data according to the new structure. In parallel, the DFG-funded World Heat Flow Database project is developing a modern research data infrastructure for the new global compilation of heat flow data. It will offer comprehensive information on heat-flow related data, publications, projects, and researchers. It is designed to reflect the criteria of FAIR and OPEN data policy and to support the interoperability with other geoscientific data services
    Type: info:eu-repo/semantics/lecture
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  • 8
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    Heatflow.world: an online application for disseminating the Global Heat Flow Database to the international heat flow community. (2023)
    In:  Abstracts
    Details
    Publication Date: 2024-05-22
    Description: The Global Heat Flow Database serves as a valuable resource for researchers studying Earth's thermal regime. However, accessing and analyzing this vast collection of geothermal data is presently challenging and limits its widespread utilization. To address this, we present a new online application to the international heat flow community, facilitating seamless discovery, access and analysis of the data. Developed within the DFG-funded World Heat Flow Database Project, it complements the evaluation of existing data and development of a new, collaborative metadata schema for heat flow data. Our application offers an intuitive interface, allowing researchers to efficiently search, retrieve, and visualize heat flow measurements worldwide. It supports advanced search functionalities that enable users to filter data based on geographical locations, geological parameters, measurement techniques, etc. Integration of powerful data visualization tools allow users to generate maps, plots, and graphs for visual exploration and interpretation. Furthermore, the application incorporates domain relevant statistical analysis functionalities, empowering researchers to perform trend analyses and other statistical assessments directly within the platform. Our application also aims to foster collaboration within the international heat flow community. We incorporate features such as user profiles, discussion forums, and the ability to contribute new data or review existing records. Overall, we hope to bridge the gap between heat flow specialists and valuable geothermal data by providing an innovative and inclusive platform. We believe this tool will significantly enhance scientific investigations into the Earth's thermal regime and serve as a catalyst for further breakthroughs in the understanding of geothermal processes.
    Type: info:eu-repo/semantics/lecture
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  • 9
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    Using continuous electrical conductivity measurements to derive major solute concentrations in karst systems (2023)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2024-05-22
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Hydrochemical data of karst springs provide valuable insights into the internal hydrodynamical functioning of karst systems and support model structure identification. However, the collection of high‐frequency time series of major solute species is limited by analysis costs. In this study, we develop a method to retrieve the individual solute concentration time series and their uncertainty at high temporal resolution for karst springs by using continuous observations of electrical conductivity (EC) and low‐frequency ionic measurements. Due to the large ion content and non‐negligible concentrations of aqueous complexes in karst systems, the concentration of each solute species occurring as free ion and as part of aqueous complexes are computed separately. The concentration of species occurring as free ions are computed considering their contributions to the total EC, whereas the concentration of the species as part of complexes are obtained from speciation calculations. The pivotal role of the complexation processes for the reconstruction of solute concentration time series starting from the EC signal is investigated in two karstic catchments with different geologies and temporal resolution of the available hydrochemical datasets, that is the Kerschbaum dolostone system in Austria and the Baget limestone system in France. The results show that complexation processes are significant and should be considered for the estimation of the total solute concentration in case of SO〈sub〉4〈/sub〉, Ca, Mg and HCO〈sub〉3〈/sub〉. The EC signal of a karst spring can be used to interpolate and quantify the dynamics of those solutes characterized by large contribution (approximately >6%) to the total EC and low relative variability, that is HCO〈sub〉3〈/sub〉, Ca and Mg. Moreover, the presented method can be used to estimate concentrations of solutes when applied to karst systems with stationary and hydrogeochemical homogeneous contributing area. On the contrary, the method is affected by large uncertainty in case of dynamic systems characterized by varying contributions of water from different geological areas. This study aims to contribute to the problem of hydrogeochemical data availability and to support future works on karst systems conceptualization.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: École Polytechnique Fédérale de Lausanne http://dx.doi.org/10.13039/501100001703
    Description: European Regional Development Fund http://dx.doi.org/10.13039/501100008530
    Description: http://www.hydroshare.org/resource/fb92daaffced415fb7a991747e73adfa
    Keywords: ddc:551.9 ; electrical conductivity decomposition ; high‐resolution hydrochemical data ; hydrochemical modelling ; karst
    Language: English
    Type: doc-type:article
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  • 10
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    Inside a sediment‐stressed Middle Devonian carpet reef: Cave exposes details of three‐dimensional facies architecture and palaeoecology (2023)
    Details
    Publication Date: 2024-05-22
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉ABSTRACT〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉During the Middle Devonian, reef growth reached an acme, and corals and stromatoporoids colonized depositional niches commonly considered unfavourable for reefal organisms. This paper documents the detailed facies architecture and palaeoecology of a stratigraphically thin (〈italic toggle="no"〉ca〈/italic〉 12 m, ‘carpet reef’), lower Givetian reefal body exposed along the walls and ceilings of the labyrinthine passages in the Klutert Cave in western Germany. The cave exposures (〈italic toggle="no"〉ca〈/italic〉 26 000 m〈sup〉2〈/sup〉 of rock surface) and data from short cores, neighbouring caves and outcrops document the growth and demise of an autoparabiostrome. The reef forms part of a parasequence with a lower carbonate and an upper clastic unit, bounded by flooding surfaces. Despite the comparatively small study area (〈italic toggle="no"〉ca〈/italic〉 1 km〈sup〉2〈/sup〉), the exceptional exposure quality reveals facies changes over relatively short distances both vertical and lateral. The sedimentary matrix of the reefal build‐up contains between 20 to 95 wt.‐% of clay and quartz of silt to sand fraction. Based on this observation, the corals and stromatoporoids thrived in murky waters and under sediment‐stressed conditions. Stromatoporoids, for example, display irregular ragged flanks, a feature that is in agreement with a sediment‐stressed environment. No evidence of reduced growth rates, decreased calcification rates, or lower numbers of species is found. In fact, coral diversity and density are highest within one of the two biostromal units that show peak clastic matrix values, indicating a remarkable adaptation of reef builders to sediment‐stressed conditions. The initial settlement of rugose phaceloid corals took place on a mixed clastic–carbonate substrate (the basal flooding surface). Up‐section, a succession of coral–stromatoporoids is present that is here described in great detail. Reef collapse occurred when much of the accommodation space was filled, and argillaceous sediments suffocated stromatoporoids and corals in a protected, low‐energy environment.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:560 ; Biostrome ; corals ; Givetian ; mixed clastic–carbonate system ; reef model ; stromatoporoids
    Language: English
    Type: doc-type:article
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