cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5880/isg.2019.002
title: The IAPG geoid based on Residual Least-Squares Collocation for the Colorado Experiment: ColRLSC-IAPG2019

description: The ColRLSC-IAPG2019 gravimetric geoid has been computed by the Institute of Astronomical and Physical Geodesy, Technical University of Munich. It has been worked out in the frame of the International Association of Geodesy Joint Working Group 2.2.2 "The 1 cm geoid experiment" and the so called "Colorado experiment". The area covered by the model is 251°E ≤ longitude ≤ 257°E, 36°N ≤ latitude ≤ 39°N with a grid spacing of 1' in both latitude and in longitude. Input data include terrestrial and airborne gravity observations, the latter being filtered for the reduction of high-frequency noise. The computation is based on the remove-compute-restore technique with XGM2018 as global geopotential and Earth2014 / ERTM2160 for the topographic gravity effects. Height anomalies are calculated by a one-step Residual Least-Squares Collocation (RLSC, Willberg et al. 2019), also including full covariance information from the high-resolution global geopotential model. The classical formula by Heiskanen and Moritz (1967) is used for the geoid/quasi-geoid separation. This conversion is based on strong simplifications and has been computed only for the purpose of the "Colorado experiment", since the ColRLSC-IAPG2019 solution is mainly focussed on the quasi-geoid computation. The accuracy of the geoid model, when compared against GSVS17 GPS/leveling, is equal to 3.1 cm. The quasi-geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
description: The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).
DOI: 10.5880/isg.2019.001
title: The IAPG quasi-geoid based on Residual Least-Squares Collocation for the Colorado Experiment: ColRLSC-IAPG2019

description: The ColRLSC-IAPG2019 gravimetric quasi-geoid has been computed by the Institute of Astronomical and Physical Geodesy, Technical University of Munich. It has been worked out in the frame of the International Association of Geodesy Joint Working Group 2.2.2 "The 1 cm geoid experiment" and the so called "Colorado experiment". The area covered by the model is 251°E ≤ longitude ≤ 257°E, 36°N ≤ latitude ≤ 39°N with a grid spacing of 1' in both latitude and in longitude. Input data include terrestrial and airborne gravity observations, the latter being filtered for the reduction of high-frequency noise. The computation is based on the remove-compute-restore technique with XGM2018 as global geopotential and Earth2014 / ERTM2160 for the topographic gravity effects. Height anomalies are calculated by a one-step Residual Least-Squares Collocation (RLSC, Willberg et al. 2019), also including full covariance information from the high-resolution global geopotential model. The accuracy of the quasi-geoid model, when compared against GSVS17 GPS/leveling, is equal to 2.9 cm. The quasi-geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
description: The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).
DOI: 10.5880/fidgeo.2021.005
title: Mechanical test data of quartz sand, garnet sand, gypsum powder (plaster), kaolin and sand-plaster mixtures used as granular analogue materials in geoscience laboratory experiments

description: This dataset provides mechanical test data for quartz sand (“MAM1ST-300”, Sibelco, Mol, Belgium), gypsum powder (plaster; “Goldband”, Knauf), kaolin clay powder, garnet sand, and mixtures of quartz sand and gypsum powder, used at the Analogue Laboratory of the Department of Geography at the Vrije Universiteit Brussel, Brussels, Belgium, for simulating brittle rocks in the upper crust (Poppe et al., 2019). The measured properties are density ρ, tensile strength T0, shear strength σ, obtained by density measurements, ring-shear tests (RST; at Helmholtz Centre Potsdam GFZ, Germany), direct shear tests, traction tests (at University of Maine, Le Mans, France) and extension tests. The obtained tensile strengths and shear strengths reconstruct two-dimensional failure envelopes for each material. By fitting linear Coulomb and non-linear combined Griffith failure criteria to the characterised failure envelopes (Jaeger et al., 2007), the internal friction coefficient µC, Coulomb cohesion CC and Griffith cohesion CG are obtained. The influence of the material emplacement technique has been investigated in Poppe et al. (2021) to which this data set is supplementary, by repeat characterisation of the above physical parameters under three emplacement conditions, i.e. sieving, pouring (non-dried state) and compaction after pouring (oven-dried state). We find that densities of the materials and mixtures range from ~1600 kg.m³ (sieved) and ~1700 kg.m³ (compacted) for pure quartz sand to ~600 kg.m³ (poured) to ~900 kg.m³ (compacted) for pure plaster. Tensile strengths range from ~166 Pa (sand) to ~425 Pa (plaster). Velocity ring-shear tests on a 90 wt% quartz sand – 10 wt% plaster mixture show a minor shear rate-weakening of &lt;2% per ten-fold increase in shear velocity. The materials show a behavior ranging from Mohr-Coulomb behavior for the materials with coarser grain size (sands) to combined Griffith-Mohr-Coulomb behavior for the powder materials (plaster, kaolin), with the sand-plaster mixtures occupying a spectrum between both end-members. Peak friction coefficients range from ~0.5 (sand) to ~0.6 (plaster) with a maximum of ~0.9 (80:20 wt% sand:plaster), peak Coulomb cohesions range from 13 Pa (sand) to 248 Pa (plaster), peak Griffith cohesions range from ~10 Pa (sand) to ~425 Pa (plaster).
DOI: 10.5880/gfz.4.8.2021.006
title: Evaluation of mineral precipitation by geochemical modeling at the Ketzin CO2 storage site, Germany

description: The data presented here contains PHREEQC geochemical modeling input and output files to model mineralogical-geochemical reactions due to the CO2 injection at the Ketzin CO2 storage site, Germany. The used modeling tool is PHREEQC version 3.4 (Parkhurst & Appelo, 2013), and the Pitzer database (PITZER.dat) is applied. The geochemical model is conducted to investigate the potential mineral precipitation in the reservoir. The available characterization of the Stuttgart Formation (Norden & Frykman, 2013) and pristine formation fluid (Würdemann et al., 2010) is used in the models. Ketzin baseline (referred as to B, data collected by Würdemann et al. (2010) and post-CO2 injection (referred as to PI, previously unpublished observation data) brine solutions were sampled and analyzed under the surface (B-S and PI-S) and reservoir conditions (B-R and PI-R). Ketzin reservoir pressure and temperature data were obtained at the observation well Ktzi 202 at a depth of 650m before and after the CO2 injection (previously unpublished observation data).
DOI: 10.15468/dl.c7pfys
title: Occurrence Download

description: A dataset containing 8042 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Acinonyx jubatus",
 "HasCoordinate is TRUE"
 ]
}

 The dataset includes 8042 records from 52 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0044175-251120083545085/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5880/gfz.lis.2019.001
title: Survey of Digital Data Management Practices at the GFZ German Research Centre for Geosciences

description: This publication contains tabular summaries of the data management survey carried out at the Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, as well as the diagrams of individual questions shown in Radosavljevic et al. (2019). The online survey was conducted from August 27 to September 27, 2019. The survey design leaned on similar surveys carried out at German universities and research institutions (e.g. Paul-Stüve et al., 2015; Simukovic et al., 2013) The survey queried aspects of the complete data life cycle - from the planning stage to reuse in 37 questions: 16 single response (SR); where only one answer was possible, and 20 multiple response (MR) where multiple answers could be selected, and one free text question. Research staff at all career levels was the target audience for the survey. Invitations to participate in the completely anonymous online survey were sent out over the general GFZ lists. The survey was carried out with the Questback EFS Survey platform. 226 attempts, out of 411, led to completed questionnaires corresponding to a 55% completion rate. Compared to the target audience at GFZ, the participation rate amounted to ca. 24%. However, less than 20% of employees classified as infrastructure support employees or bachelor’s and master’s students and student assistants completed the survey. Replies falling into these categories were grouped into “others” in the report as well as in the data presented here. Data summaries are given in two tab-separated tables corresponding to response counts or percentage for each question. These are grouped by department, role and employment length. Questions 5 and 34 were ranking questions and the corresponding responses in the percentages table represent arithmetic means of the replies for these questions – not percentages. The response counts for these question are presented in the “Counts” table. Free text replies are omitted from these results. In addition, the diagrams of individual questions are presented Radosavljevic et al. (2019) are also provided in png and pdf formats.
DOI: 10.5880/gfz.lis.2015.001
title: Schematic overview of a typical terrestrial and shallow-marine permafrost landscape during summer and winter

description: Schematic overview of a typical terrestrial and shallow-marine permafrost landscape during summer and winter. Permafrost is defined as ground that remains continuously at or below 0°C for at least two consecutive years; some 24% of the land surface in the northern hemisphere is classified as permafrost. This schematic figure (summer) pictures a terrestrial and shallow marine permafrost system. A permafrost landscape is characterized by its large heterogeneity with morphological permafrost-related features such as polygonal patterned ground with underlying ice wedges,  thaw ponds, thermokarst lakes, and wetland areas. During winter, the terrestrial landscape is covered with snow, and water bodies and the ocean are typically covered with ice.The last pictures shows schematically the fluxes (not scaled) that occur between the terrestrial and marine environment and atmosphere.
DOI: 10.5880/gfz.4.8.2021.004
title: Processed seismic data and ERT inversion models used in the estimation of injected masses for the Ketzin CO2 pilot project for the years 2009 and 2012

description: Seismic and geoelectric/electro-magnetic methods are used as complementary tools for the identification of fluid/gas effects in underground storage and production scenarios. Both methods generally have very different resolution. Seismic tends to be acquired by much more dense geometrical layouts and the geoelectric or electro-magnetic acquisition being a potential field method shows information integrated over spatial distances. These inherent scale and design dependent differences require spatial tuning in joint inversion approaches and careful matching in independent interpretations of both methods. We present results matching seismic and electrical resistivity tomography (ERT) results from two repeat surveys acquired during CO2 storage operations at the Ketzin pilot site in Germany. Datasets are provided in HDF5 format and grouped in different levels. Two main levels exist. Raw data includes processed seismic data and ERT inversion results. Seismic mass estimation relies on amplitude differences and timeshifts. ERT inversion results have been converted from VTK. Please read the data description file for more information.
description: The dataset was created within SECURe project (Subsurface Evaluation of CCS and Unconventional Risks) - https://www.securegeoenergy.eu/. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 764531. Grant Ref ENER/H2020/764531/SECURe
DOI: 10.5880/gfz.3.1.2020.005
title: Differentiating between hydrothermal and diagenetic carbonates using rare earth element and yttrium (REE+Y) geochemistry: A case study from the Paleoproterozoic George Fisher massive sulphide Zn deposit

description: Carbonate minerals are ubiquitous in most sediment-hosted mineral deposits. These deposits can contain a variety of carbonate types with complex paragenetic relationships. When normalized to chondritic values (CN), rare-earth elements and yttrium (REE+YCN) can be used to constrain fluid chemistry and fluid-rock interaction processes in both low- and high-temperature settings. Unlike other phases (e.g., pyrite), the application of in situ laser ablation-inductively coupled plasma-mass spectroscopy (LA-ICP-MS) data to the differentiation of pre-ore and hydrothermal carbonates remains relatively untested. To assess the potential applicability of carbonate in situ REE+Y data, we combined transmitted light and cathodoluminescence (CL) petrography with LA-ICP-MS analysis of carbonate mineral phases from (1) the Proterozoic George Fisher clastic dominated (CD-type) massive sulfide deposit and from (2) correlative, barren host rock lithologies (Urquhart Shale Formation). The REE+YCN composition of pre-ore calcite suggests it formed during diagenesis from diagenetic pore fluids derived from ferruginous, anoxic seawater. Hydrothermal and hydrothermally altered calcite and dolomite from George Fisher is generally more LREE depleted than the pre-ore calcite, whole-rock REE concentrations, and shale reference values. We suggest this is the result of hydrothermal alteration by saline Cl--rich mineralizing fluids. Furthermore, the presence of both positive and negative Eu/Eu* values in calcite and dolomite indicates that the mineralizing fluids were relatively hot (&gt;250°C) and cooled below 200-250°C during ore formation. This study confirms the hypothesis that in situ REE+Y data can be used to differentiate between pre-ore and hydrothermal carbonate and provide important constraints on the conditions of ore formation.
DOI: 10.15468/dl.tj28yr
title: Occurrence Download

description: A dataset containing 14 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Proclea glabrolimbata",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 14 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0044177-251120083545085/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5880/pik.2020.009
title: Data from Climate Model Ensemble Simulations for the Mesozoic Climate Evolution

description: In “Investigating Mesozoic Climate Trends and Sensitivities with a Large Ensemble of Climate Model Simulations” we study global trends in the climatic evolution through the Mesozoic era (252-66 Ma). The data presented here is the model output on which the results of this manuscript are based. Also included are different boundary condition model input files and scripts to generate the included figures (using the Python programming language in a Jupyter Notebook). The model output is provided in different netcdf files. The data is generated using the coupled ocean-atmosphere model CLIMBER3alpha (Montoya et al. 2005) which models climate globally on a 3.75° x 3.75° (ocean, lon.x lat.) and 22.5° x 7.5° (atmosphere) grid. Please note that data from other research that is shown in the figures in Landwehrs et al. (2020a) is not included in this data publication to avoid copyright issues.
description: The data is model input and output for/from the coupled ocean-atmosphere model CLIMBER3alpha which models climate globally on a 3.75° x 3.75° (ocean, lon.x lat.) and 22.5° x 7.5° (atmosphere) grid.
DOI: 10.5880/gipp-mt.201811.1
title: Reconnaissance magnetotelluric measurements in northern Bavaria

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).
description: The Geophysical Instrument Pool Potsdam (GIPP) provides field instruments for (temporary) seismological studies (both controlled source and earthquake seismology) and for magnetotelluric (electromagnetic) experiments. The GIPP is operated by the GFZ German Research Centre for Geosciences. The instrument facility is open for academic use. Instrument applications are evaluated and ranked by an external steering board. See Haberland and Ritter (2016) and https://www.gfz-potsdam.de/gipp for more information.
DOI: 10.5880/gipp-mt.201706.1
title: Magnetotelluric Study of the Hangai Dome, Mongolia: Phase II

description: Surface deformation in the continental interior, away from active tectonic margins, is enigmatic, with the underlying mechanisms responsible not fully understood. Therefore, it is considered an open and important question in continental dynamics. The Hangai Dome, central Mongolia, is an ideal location to explore this because it is a high-elevation, low-relief, intra-continental region within the Mongolian plateau, between the Siberian and North China cratons, and within the Central Asian Orogenic Belt. The tectonic history of Central Mongolia is not well understood. It consists of several lithotectonic units that have influenced the formation and development of the region. The Hangai region has had intraplate volcanism throughout the Cenozoic, including as recently as the Holocene, in addition to older Mesozoic volcanic activity. It is characterized by dispersed, low-volume, alkali basaltic volcanism. Furthermore, major shear fault systems bound the Hangai region and central Mongolia. Our objective is to collect high-resolution magnetotelluric data to image the electrical resistivity structure of the crust and upper mantle beneath the Hangai Dome in order to better understand the processes and mechanisms responsible for intracontinental uplift and intraplate volcanism in this unique region, helping shed light on the Hangai region. Building on the successful first phase of the project (2016), a second phase was completed in 2017. We expanded our magnetotelluric measurement array: to the west along four new profiles; to the south, across the Gobi-Altai mountains; to the north, across the Bulnay fault segments; filling in the previous profiles for denser site spacing. This new grid of data is ~650 km long and ~400 km wide, with a nominal site spacing of 50 km for broadband measurements. In addition, we completed a small profile across the Tariat/Khorgo region and a reconnaissance profile in Zavkhan. This data report provides details on the data collection, the measurement site locations, the instrumentation, and the data format. This data publication (10.5880/GIPP-MT.201706.1) 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).
description: The Geophysical Instrument Pool Potsdam (GIPP) provides field instruments for (temporary) seismological studies (both controlled source and earthquake seismology) and for magnetotelluric (electromagnetic) experiments. The GIPP is operated by the GFZ German Research Centre for Geosciences. The instrument facility is open for academic use. Instrument applications are evaluated and ranked by an external steering board. See Haberland and Ritter (2016) and https://www.gfz-potsdam.de/gipp for more information.