Grain properties and crystal-preferred orientation for EGRIP ice core samples (vertical sections), 111-2651 m depth

DOI

Fabric Analyser (G50, Russell-Head Instruments) image data from vertical thin sections from the EGRIP ice core were processed with the software cAxes (version 21.06.21 slim), using manually prepared mask images (background.bmp) to exclude image artefacts from the sample margins, to obtain segmented grain data and crystal-preferred orientation data. 1152 sections from 225 bags were measured in the field camp at EGRIP, Greenland, during field seasons 2017, 2018, 2019, 2022, and 2023. A bag refers to an ice core segment of 55 cm length which is typically cut into six pieces of 9 cm length from which thin sections are prepared using a manual sledge microtome. The majority of bags are continuously sampled with up to six adjacent samples with a bag interval of approx. 10 +- 6 m. Up to three parallel and/or orthogonal vertical sections were prepared only from ice core volume samples (75% of ice core from bottom of approx. every 200th bag, corresponding to depth of 6th sample in bag). Data are not available between 2121 and 2417 m. The results from the image processing include a table listing samples, ice core depth and per-section statistical parameters on grains (number, mean grain size) and c-axis orientation (grain- and area-weighted second-order orientation tensor eigenvalues, woodcock parameter). For each sample attached data files provide additional info on grains in a section (grains.txt), measurement, processing parameters and further statistical c-axis orientation parameters (results.txt) and a false-color image of the section showing microstructure and per-grain c-axis orientation via a colorcode (*rgb.png). Sample files are named according to the convention EGRIP_-_.

Identifier
DOI https://doi.org/10.1594/PANGAEA.983909
Related Identifier IsPartOf https://doi.org/10.1594/PANGAEA.983953
Related Identifier References https://doi.org/10.5194/egusphere-2024-2653
Related Identifier References https://gitlab.awi.de/caxes/caxes
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.983909
Provenance
Creator Stoll, Nicolas ORCID logo; Kerch, Johanna ORCID logo; Darányi, Kyra ORCID logo; Eichler, Jan ORCID logo; Jansen, Daniela ORCID logo; Weikusat, Ilka ORCID logo
Publisher PANGAEA
Publication Year 2025
Rights Creative Commons Attribution-ShareAlike 4.0 International; https://creativecommons.org/licenses/by-sa/4.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 19633 data points
Discipline Geosciences; Geospheric Sciences; Glaciology; Natural Sciences
Spatial Coverage (-35.980 LON, 75.630 LAT); Greenland