cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.13140/rg.2.2.29631.89765
title: [DEPRECATED] "Figure 1: [Pathway Diagram] The role of mitochondrial dysfunction in chronic disease and aging" from "ME/CFS: Correcting Chronic Mitochondrial Dysfunction v0.948" A WIP map of relevant biochemical pathways and influences relating to ME/CFS.
DOI: 10.14470/ab466166
title: Seismic network 5E: MINAS Project (2011/2013)

description: The integrated plate boundary in Chile (IPOC) combines 15 broadband stations with strong-motion sensors, GPS, strain sensors and magneto-telluric stations. The Chilean subduction zone setting provides a high background rate of seismicity (crustal, intermediate depth, and plate interface) in a region with exceptionally low ambient noise, particularly at higher frequencies. We have deployed seismic mini-arrays in the vicinity of IPOC stations PB02 and PB07, and installed a third array to the east of these stations near the village of Quillagua, such that all three arrays form a triangle. Each array has 10 elements and an aperture in the km range. The study area lies just to the north of the northern boundary of the rupture area of the Tocopilla earthquake of 2007 (Mw=7.7) and just above or slightly to the east of the downdip limit of plate interface seismicity. Installing the mini-arrays in the area of the existing IPOC has the following advantages: * Independent knowledge of background structure and seismicity from existing and ongoing studies. * Should any transients or other unusual signals be found in the array data, we can look for anomalous signals in geodetic and MT recordings, which will help to narrow down possible underlying mechanisms.
DOI: 10.5281/zenodo.17877372
title: Codes and data for "The expanding Indo-Pacific freshwater pool and changing freshwater pathway in South Indian Ocean"

description: Codes and data for "The expanding Indo-Pacific freshwater pool and changing freshwater pathway in South Indian Ocean"
DOI: 10.5880/fidgeo.2021.009
title: TropSOC Database

description: We provide version 1.0 of an open access database created as part of the project “Tropical soil organic carbon dynamics along erosional disturbance gradients in relation to variability in soil geochemistry and land use” (TropSOC). TropSOC v1.0 contains spatial and temporal explicit data on soil, vegetation, environmental properties and land management collected from 136 pristine tropical forest and cropland plots between 2017 and 2020 as part of several monitoring and sampling campaigns in the Eastern Congo Basin and the East African Rift Valley System. The results of several laboratory experiments focussing on soil microbial activity, C cycling and C stabilization in soils complement the dataset to deliver one of the first landscape scale datasets to study the linkages and feedbacks between geology, geomorphology and pedogensis as controls on biogeochemical cycles in a variety of natural and managed systems in the African Tropics. Sampling procedures are described in each metadata description .pdf file accompanying a specific .csv file that represents a methodologically distinct subset of the database. A general overview of field sampling procedures and design is given in Doetterl et al., (2021, ESSD in review) which describes the dataset as a whole. Analytical procedures are described in each metadata description .pdf file accompanying a specific .csv file that represents a methodologically distinct subset of the database. Data processing and quality control are described in each metadata description .pdf file accompanying a specific .csv file that represents a methodologically distinct subset of the database.
DOI: 10.5281/zenodo.17877371
title: Codes and data for "The expanding Indo-Pacific freshwater pool and changing freshwater pathway in South Indian Ocean"

description: Codes and data for "The expanding Indo-Pacific freshwater pool and changing freshwater pathway in South Indian Ocean"
DOI: 10.5880/gfz.2.2.2024.001
title: Fiber optic data while primary cementing - Distributed Temperature and Distributed Vibrational Energy from a Distributed Dynamic Strain Sensing

description: For the safe and sustainable use of deep geothermal wells, construction must proceed as intended. An integer well ensures that all fluids within the borehole are always under control. One of the most critical steps is the cementing of the casings. Despite extensive experience in the petroleum industry, challenges with well integrity are a worldwide phenomenon. One reason could be that conventional measurement methods can only verify the success of cementing once the cement job has been completed. In contrast, distributed fiber optic sensing methods can monitor the entire cementing process along the entire drilling path. 
 
This data set contains the results of the Distributed Temperature Sensing (DTS) and the derived product "vibrational energy" of a Distributed Dynamic Strain Sensing (DDSS or DAS) of the whole cementing process. We collected this data during the primary cementing of an injection well's 874m surface casing at the geothermal site Schäftlarnstr, Munich. We measured the cement placement and 24 hours of the early hydration. 
 
We obtained the data with a fiber optic cable permanently deployed behind the casing. The cable contained Multi-Mode fibers (for DTS) and Single-Mode fibers (for DAS). Table 1 in the data description document shows the units used and the key parameters of our measurement. 
 
In the first step, we allocated each channel to its depth in the borehole. We used a cold spray (for DTS) and a tap test (for DAS) to locate the entry to the borehole. To obtain the vibrational energy of the DAS data, we summarized the raw dynamic strain with a Root Mean Square (RMS) in a window of 60 seconds. We calculated the vibrational energy for a wide range of different frequency ranges (Butterworth bandpass). The data are provided in csv formats and further explained in the data description document. 
 
Acknowledgement: 
GFK-Monitor is funded by the Federal Ministry for Economic Affairs and Climate Action via the Project Management Jülich (PTJ) (funding code: 03EE4036, project duration: July 1, 2022 - June 30, 2025). The fiber optic infrastructure was provided by GAB (Geothermie Allianz Bayern): Funded by: Bayerisches Staatsministerium für Wissenschaft und Kunst (Hauptgebäude: Salvatorstraße 2, 80333 München).
DOI: 10.5880/kp.0001
title: Geomagnetic Kp index

description: This data publication includes the IAGA-endorsed Kp index of geomagnetic activity as well as the derived indices ap, Ap, Cp and C9 in their definitive and nowcast version and the International Quiet and Disturbed Days. This dataset is provided by GFZ and derived from indices or near real-time geomagnetic observatory data provided by 13 contributing observatories. The Kp index and the derived products are distributed by GFZ and they are redistributed by various data centers and databases. When using the Kp index or any of the derived products of this dataset, please cite this data publication as well as the accompanying publication Matzka et al. (2021), which serves as a contemporary reference for users and describes the dataset and the state of the Kp index 70 years after its introduction.

The Kp index 
The Kp index was introduced by Bartels (1949). We follow here generally the notation of Bartels (1957). A comprehensive list of references on the Kp index is provided in Matzka et al. (2021), which also describes the near real-time distribution of the indices. 

DOI and versioning
With the introduction of the DOI ‘https://doi.org/10.5880/Kp.0001’ for the dataset, the DOI landing page and the associated FTP server linked to this DOI become the dataset's primary archive (while the other established index distribution mechanisms at GFZ will be maintained in parallel). With the DOI, the dataset can grow with time, but a change of the data, once published, is not possible. If necessity arises in the future to correct already published values, then the corrected dataset will be published with a new DOI. Older DOIs and data sets will then still be available. For each DOI, an additional versioning mechanism will be available to document changes to the files such as format changes, which do not affect the integrity of the data. The DOI 10.5880/Kp.0001 identifies the current version.
description: The dataset is organised in yearly files, which, for the current year, are updated on a monthly basis. Typically, during the second week of a month, the data for the previous month is calculated and appended to the current year's file, both for the definitive and nowcast version. While the definitive Kp (and derived indices) are calculated from K values provided by the contributing observatories, the nowcast Kp (and derived indices) are calculated at GFZ from observatory data provided by the contributing observatories. The data are distributed in ASCII files. All files start with 10 header lines, each starting with a number sign (#, hash) and containing DOI as well as license information. Note that leading zeroes are not shown, they are represented by blanks. Missing data would be represented by -1. For more information, please refer to the associated data description and Matzka et al. (2021).
DOI: 10.14470/1n134371
title: WALPASS Network, Namibia, 2010/2012

description: The Etendeka continental flood-basalt province in northern
Namibia, linked by the Walvis Ridge to the Tristan da Cunha hotspot, has great importance in global plate tectonic
concepts, and is an ideal place to understand the role of the plume-lithosphere interaction during the break-up of the
Southern Atlantic Ocean. Within this frame we operated an amphibian passive-source seismic network (WALPASS for Walvis
Ridge Passive Source Experiment) in the region where the Walvis Ridge intersects with the continental margin of
northern Namibia. The land network operated for over two years while the OBS stations were in operation for one year.
The broadband seismic network is composed of 28 three-component land stations and 12 ocean-bottom
stations. This configuration of stations will allow us to map the lithospheric and upper mantle structure in the
ocean-continent transition beneath the passive continental margin of northern Namibia and to examine possible seismic
anomalies related to the postulated hotspot track from the continent to the ocean along the Walvis Ridge. The acquired
data should help clarify the velocity anomaly in the lowermost mantle caused by the Africa super plume and to
improve the distribution of seismicity in this geophysically little studied region.
DOI: 10.5286/isis.e.rb2520249-1
title: Highly stable surface functionalized MoS2 nanoparticles as high temperature lubricant additives: Nanostructural insights from SANS

description: There is currently an urgent need for sustainable high temperature lubricant additives in critical industrial applications. Inorganic nanoparticles (NPs) have been intensively investigated as lubricant additives. However, it is extremely challenging to synthesize highly stable NP dispersions in non-polar media. We have prepared surface functionalized molybdenum disulfide (FMoS2) NPs with unprecedented long-term stability (over 1 month or longer) in a range of nonpolar solvents, using a simple and scalable method via ball milling, in a systematic effort to address the bottleneck of poor NP dispersibility in liquid media. This opens up a new pathway for preparation of surface modified NPs, facile and highly versatile – which can be used as friction-reducing and anti-wear (AW) additives in polar base oils and nonpolar hydrocarbon oils by varying the tail group chain polarity using different polymers. Moreover, tribological measurements indicates that the addition of FMoS2 NPs in PAO significantly reduced the friction of base oil and protected the surface from wear at elevated temperatures. Here, we propose first SANS characterization of dispersion of FMoS2 NPs in oil (n-dodecane), proving definitive nanostructural information on the size, shape, and structure of this highly innovative stable nanofluid. The results will underpin future rational design of surface functionalized NPs as a new class of high temperature (HT) lubricants.
DOI: 10.5880/fidgeo.2025.008
title: Mineral chemical and sulfur isotope data for precious metal mineralized rocks of the Rum layered intrusion, NW Scotland

description: Samples of sulfide-hosted platinum-group element (PGE) mineralization from the Rum layered intrusion (NW Scotland) were studied to elucidate the crystallization history of base-metal sulfide in magmatic ore deposits. A corollary aim was to examine the controls on platinum-group mineral exsolution from sulfide in these settings. Secondary ion mass spectrometry data for sulfides reveal significant sulfur isotopic heterogeneity in all of the Rum sulfide-bearing materials studied. For example, in a PGE-rich chromitite, we find a range of δ34S exceeding 10‰ (-4.3 to +5.9‰) in base-metal sulfides within an area of &lt;1 cm2. Similar ranges of δ34S heterogeneity (~10‰), albeit shifted to values as low as -15‰, are observed in disseminated sulfides in troctolite and peridotite lithologies sampled from the intrusion margins. The relatively light δ34S end member reflects crustal contamination of the Rum parental magmas (with δ34S of +1.9‰) during construction of the intrusion. We attribute the extension to relatively heavy δ34S in all samples to loss of sulfur due to sulfide breakdown at relatively low temperatures; on the basis of Rayleigh distillation modelling we estimate &lt;100 °C. Degradation of primary sulfide (pyrrhotite, pentlandite and chalcopyrite) is observed in the textures of all samples, as are low sulfur phases such as chalcocite and digenite that are generally interpreted to result from low temperature oxidation processes. The chromitite sulfides have S/Se values as low as 600, also signifying sulfur loss. In situ PGE abundance measurements in sulfides from all samples indicate that desulfurization affected precious metal tenors in the chromitite sulfides more than the other samples, and there is a strong spatial pattern of PGM occurring at sulfide margins and within Fe-oxide produced by sulfide breakdown. Collectively, our new results suggest that low temperature sulfur loss, possibly as aqueous sulfate during alteration at low fluid-rock ratios, was capable of significantly modifying, but not completely erasing, primary isotopic heterogeneity in the Rum system. Aside from the effects of sulfur mobility in precious metal ore deposits, these findings highlight the micron-scale distances over which sulfur isotope heterogeneity occurs in sub-volcanic basaltic systems and show that sulfur mobility in such settings may continue to very low temperatures.
DOI: 10.5286/isis.e.rb2520249
title: Highly stable surface functionalized MoS2 nanoparticles as high temperature lubricant additives: Nanostructural insights from SANS

description: There is currently an urgent need for sustainable high temperature lubricant additives in critical industrial applications. Inorganic nanoparticles (NPs) have been intensively investigated as lubricant additives. However, it is extremely challenging to synthesize highly stable NP dispersions in non-polar media. We have prepared surface functionalized molybdenum disulfide (FMoS2) NPs with unprecedented long-term stability (over 1 month or longer) in a range of nonpolar solvents, using a simple and scalable method via ball milling, in a systematic effort to address the bottleneck of poor NP dispersibility in liquid media. This opens up a new pathway for preparation of surface modified NPs, facile and highly versatile – which can be used as friction-reducing and anti-wear (AW) additives in polar base oils and nonpolar hydrocarbon oils by varying the tail group chain polarity using different polymers. Moreover, tribological measurements indicates that the addition of FMoS2 NPs in PAO significantly reduced the friction of base oil and protected the surface from wear at elevated temperatures. Here, we propose first SANS characterization of dispersion of FMoS2 NPs in oil (n-dodecane), proving definitive nanostructural information on the size, shape, and structure of this highly innovative stable nanofluid. The results will underpin future rational design of surface functionalized NPs as a new class of high temperature (HT) lubricants.
DOI: 10.5880/icdp.5071.004
title: On-line Gas Monitoring during Drilling - Data from the ICDP Expedition 5071, DIVE (Drilling the Ivrea-Verbano zonE), boreholes 5071_1_A and 5071_1_B

description: The drillings of the ICDP-DIVE project located in the Central part of the Ivrea-Verbano Zone at the Linea Cadorna in Migiandone near Ornavasso were accompanied by On-Line Gas Monitoring. During the drilling of both boreholes 5071_1_A (IGSN ICDP5071EH10001) and 5071_1_B (IGSN ICDP5071EH30001) O2, N2, 40Ar, 38Ar, 36Ar, CO2, CH4, H2, He and 222Rn were measured. The dataset contain for each species its concentration over time and depth. Gases were continuously recovered by degassing the drilling mud and quantified using two quadrupole mass spectrometers (QMS): an Omnistar GSD 300 (Pfeiffer Vacuum®, Germany) and a miniRUEDI (Gasometrix®, Switzerland) and an AlphaGUARD radon monitor (Bertin Technologies®, France). Baselines were corrected using the asymmetric least squares smoothing method from Eilers and Boelens (2005) resulting in an uncertainty not exceeding 3% for all the concentrations. All data provided are lag-time (and lag-depth) corrected with an error of less than 1 m.
DOI: 10.5880/nerograv.2023.003
title: Regularized Empirical Variance-Covariance-Matrices for stochastic gravity modeling of 8 major ocean tides

description: This data publication represents the main outcomes of WP1.200 of Individual Project IP1 and Deliverable D1.1 of the research unit NEROGRAV. The goal of WP1.200 was the realistic representation of modern ocean tide model uncertainties in the form of empirical Variance-Covariance Matrices (VCMs) for the utilization in satellite gravimetric dealiasing. In the following, we describe the data set generation and format. A more detailed description of the processing strategy of the data set can be found in Abrykosov et al. (2021).
description: A deep understanding of mass distribution and mass transport in System Earth is needed to answer central questions in hydrology, oceanography, glaciology, geophysics and climate research. The necessary information is primarily derived from satellite mission data as observed by GRACE (Gravity Recovery and Climate Experiment) and GRACE-FO (Follow-on) describing the gravity field of the Earth and its temporal variations. The research group (RG) „New Refined Observations of Climate Change from Spaceborne Gravity Missions (NEROGRAV)”, funded by the German Research Foundation (DFG), develops since May 2019 new analysis methods and modeling approaches to improve GRACE and GRACE-FO mission data analysis and focuses on geophysical applications that benefit from significantly reduced error levels in the time series of monthly gravity fields. Phase 1 lasted from May 2019 till April 2022. After successful evaluation in January 2022 the second phase started in January 2023. The central hypothesis of the research group, slightly updated for phase 2, is: Only by concurrently improving and better understanding of sensor data, background models, and processing strategies of satellite gravimetry, the resolution, accuracy, and long-term consistency of mass transport series can be significantly increased; the science return in various fields of application improved and the potential of future technological sensor developments fully exploited. All groups participating in NEROGRAV have a long-term heritage of expertise in geodetic data acquisition and modeling and will additionally contribute their unique complementary expertise from various neighboring disciplines such as oceanography, hydrology, solid Earth, geophysics and atmospheric and climate sciences. Therefore, it is expected that the second funding phase will not only create significantly improved GRACE/GRACE-FO gravity field models over two decades, but also enable geophysical applications based on this long-term series such as quantifying North Atlantic deep water transports as indicator for variations in the Atlantic Meridional Overturning Circulation (AMOC), assessment of hydrometeorological extreme events or identification of climatic signatures in variations of the terrestrial water storage. Important results and datasets of phase 1 can be found at GFZ Data Services.
DOI: 10.5880/nerograv.2023.004
title: AOe07 Variance-Covariance-Matrix

description: The Atmosphere and Ocean non-tidal De-aliasing Level-1B (AOD1B) product is widely used in satellite gravimetry to correct for transient effects of atmosphere-ocean mass variability that would otherwise alias into monthly-mean global gravity fields. The most recent release is based on the global ERA5 reanalysis and ECMWF operational data together with simulations from the general ocean circulation model MPIOM consistently forced with fields of the same atmospheric data-set. As background models are inevitably imperfect, residual errors due to aliasing remain. Accounting for the uncertainties of the background model data has, however, proven to be a useful approach to mitigate the impact of residual aliasing. In light of the changes made in the new release of AOD1B, previous uncertainty assessments are deemed too pessimistic and have been revised in the new time-series of true errors: AOe07. One possible way to include the uncertainty information of background models in gravity field estimation or simulation studies is through the computation and application of a variance-covariance matrix that describes the spatio-temporal error characteristics of the background model. The AOe07 variance-covariance-matrix provides this information through (1) a fully populated matrix up to degree and order 40 as well as (2) a diagonal matrix up to degree and order 180.
DOI: 10.5880/icgem.2018.003
title: ITSG-Grace2018 - Monthly, Daily and Static Gravity Field Solutions from GRACE

description: The ITSG-Grace2018 gravity field model is the latest GRACE-only gravity field model computed at Graz University of Technology, providing unconstrained monthly and regularized daily solutions as well as a long-term static field. For each month of the observation period, sets of spherical harmonic coefficients for different maximum degrees (60, 96, 120) were estimated without applying any regularization.
      In order to resolve high-frequency gravity field variations as detailed as possible, a set of spherical harmonic coefficients up to degree and order 40 was co-estimated. K-band range rates with a sampling of 5 seconds and kinematic orbits with a sampling of 5 minutes were used as observations. The kinematic orbits of the GRACE satellites (Zehentner and Mayer-Gürr 2013, 2014) were processed using the GPS orbits and clock solutions provided by CODE. Additionally, a full accelerometer scale factor matrix was estimated per day (Klinger and Mayer-Gürr, 2016). The accelerometer bias was modelled through cubic splines with a node interval of six hours and estimated for each axis and day. Detailed information about ITSG-Grace2018 is available at http://ifg.tugraz.at/ITSG-Grace2018. The monthly and daily data covers the period between April 2002 and August 2016.
description: Monthly solutions:product_type gravity_fieldmodelname ITSG-Grace2018_nLL_YYYY-MMearth_gravity_constant 3.9860044150e+14radius 6.3781363000e+06max_degree LL errors formalnorm fully_normalizedtide_system zero_tide
      Daily solutions:product_type gravity_fieldmodelname ITSG-Grace2018_n40_YYYY-MM-DDearth_gravity_constant 3.9860044150e+14radius 6.3781363000e+06max_degree 40errors formalnorm fully_normalizedtide_system zero_tide
      Static Field:product_type gravity_fieldmodelname ITSG-Grace2018searth_gravity_constant 3.9860044150e+14radius 6.3781363000e+06max_degree 200errors formalnorm fully_normalizedtide_system zero_tide