Grain properties and crystal-preferred orientation for EGRIP ice core samples (vertical sections), 111-2651 m depth
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2025
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| _version_ | 1867169484671811584 |
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| author | Stoll, Nicolas Kerch, Johanna Darányi, Kyra Eichler, Jan Jansen, Daniela Weikusat, Ilka |
| author_facet | Stoll, Nicolas Kerch, Johanna Darányi, Kyra Eichler, Jan Jansen, Daniela Weikusat, Ilka |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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<bag>_<section>-<cut>_<additional-info>. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_983909 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Grain properties and crystal-preferred orientation for EGRIP ice core samples (vertical sections), 111-2651 m depth Stoll, Nicolas Kerch, Johanna Darányi, Kyra Eichler, Jan Jansen, Daniela Weikusat, Ilka AWI_Glac; Bag number; CPO; Cut; DEPTH, ice/snow; East Greenland Ice-core Project; EastGRIP; EGRIP; Eigenvalue 1; Eigenvalue 2; Eigenvalue 3; Fabric; Fabric Analyser; Fabric Analyzer G50 (FA); Glaciology @ AWI; Grain area, mean; Grains; Grain Size; Grain size, mean; Greenland; Ice core; ICEDRILL; Ice drill; Image, ice core; Microstructure; Sample code/label; Section; Text file; Weighed (scale); Weighted (statistic); Woodcock shape parameter 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<bag>_<section>-<cut>_<additional-info>. |
| title | Grain properties and crystal-preferred orientation for EGRIP ice core samples (vertical sections), 111-2651 m depth |
| topic | AWI_Glac; Bag number; CPO; Cut; DEPTH, ice/snow; East Greenland Ice-core Project; EastGRIP; EGRIP; Eigenvalue 1; Eigenvalue 2; Eigenvalue 3; Fabric; Fabric Analyser; Fabric Analyzer G50 (FA); Glaciology @ AWI; Grain area, mean; Grains; Grain Size; Grain size, mean; Greenland; Ice core; ICEDRILL; Ice drill; Image, ice core; Microstructure; Sample code/label; Section; Text file; Weighed (scale); Weighted (statistic); Woodcock shape parameter |
| url | https://doi.org/10.1594/PANGAEA.983909 |