Stoll, Nicolas; Kerch, Johanna; Darányi, Kyra; Eichler, Jan; Jansen, Daniela; Weikusat, Ilka (2025): Grain properties and crystal-preferred orientation for EGRIP ice core samples (horizontal sections), 111-2664 m depth [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983923, In: Weikusat, Ilka; Stoll, Nicolas; Kerch, Johanna; Eichler, Jan; Jansen, Daniela; Darányi, Kyra; Kleitz, Ina; Shigeyama, Wataru; Homma, Tomoyuki; Bayer, Maddalena; Götz, Pia; Kuiper, Ernst-Jan N; Saruya, Tomotaka; Franke, Steven; Hellmann, Sebastian; Rathmann, Nicholas Mossor; Wallis, David; Cook, Eliza; Kipfstuhl, Sepp (2025): Crystal-preferred orientation data from the polar ice core EGRIP (vertical and horizontal thin section data, raw and processed), 111-2664 m depth, 2017 - 2023 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.983953
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Published: 2025-07-21 • DOI registered: 2025-07-21
Abstract:
Fabric Analyser (G50, Russell-Head Instruments) image data from horizontal 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. 66 sections from 18 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. Horizonal 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>.
Related to:
Stoll, Nicolas; Weikusat, Ilka; Jansen, Daniela; Bons, Paul D; Darányi, Kyra; Westhoff, Julien; Llorens, Maria-Gema; Wallis, David; Eichler, Jan; Saruya, Tomotaka; Homma, Tomoyuki; Rasmussen, Sune Olander; Sinnl, Giulia; Svensson, Anders M; Drury, Martyn R; Wilhelms, Frank; Kipfstuhl, Sepp; Dahl-Jensen, Dorthe; Kerch, Johanna (2025): Linking crystallographic orientation and ice stream dynamics: evidence from the EastGRIP ice core. The Cryosphere, 19(9), 3805-3830, https://doi.org/10.5194/tc-19-3805-2025
Related code / software:
cAxes [software]. GitLab, https://gitlab.awi.de/caxes/caxes
Further details:
Colorcode for the false-color images of segmented thin sections produced by cAxes; color indicates the direction of c-axis for each detected ice crystal (grain), center (white) corresponds to the vertical parallel to the ice core axis. cAxes_rgb_colorwheel.png
Project(s):
East Greenland Ice-core Project (EGRIP)
Glaciology @ AWI (AWI_Glac)
Coverage:
Latitude: 75.630000 * Longitude: -35.980000
Minimum DEPTH, ice/snow: 111.560 m * Maximum DEPTH, ice/snow: 2663.100 m
Event(s):
Comment:
It is likely that samples 1208_6-top and 1400_6-top were accidentally permuted during data acquisition.
Volume sample 400_6 was sliced in 34 horizontal sections.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Weikusat, Ilka | |||
| 2 | Bag number | Bag | Weikusat, Ilka | |||
| 3 | Section | Sect | Weikusat, Ilka | |||
| 4 | Cut | Cut | Weikusat, Ilka | |||
| 5 | DEPTH, ice/snow | Depth ice/snow | m | Weikusat, Ilka | Geocode | |
| 6 | Grains | Grains | # | Weikusat, Ilka | Fabric Analyzer G50 (FA) | |
| 7 | Grain size, mean | Grain size mean | pixel | Weikusat, Ilka | Fabric Analyzer G50 (FA) | |
| 8 | Grain area, mean | Grain area mean | mm2 | Weikusat, Ilka | Fabric Analyzer G50 (FA) | |
| 9 | Eigenvalue 1 | EVA1 | Weikusat, Ilka | Fabric Analyzer G50 (FA) | ||
| 10 | Eigenvalue 2 | EVA2 | Weikusat, Ilka | Fabric Analyzer G50 (FA) | ||
| 11 | Eigenvalue 3 | EVA3 | Weikusat, Ilka | Fabric Analyzer G50 (FA) | ||
| 12 | Woodcock shape parameter | Woodcock param | Weikusat, Ilka | Fabric Analyzer G50 (FA) | ||
| 13 | Eigenvalue 1 | EVA1 | Weikusat, Ilka | Weighted (statistic) | ||
| 14 | Eigenvalue 2 | EVA2 | Weikusat, Ilka | Weighted (statistic) | ||
| 15 | Eigenvalue 3 | EVA3 | Weikusat, Ilka | Weighted (statistic) | ||
| 16 | Woodcock shape parameter | Woodcock param | Weikusat, Ilka | Weighed (scale) | ||
| 17 | Text file | TEXT | Weikusat, Ilka | Information for grain distribution per section (grain number, grain coordinates, grain size, c-axis angles) | ||
| 18 | Text file | TEXT | Weikusat, Ilka | Section information on measurement and processing (instrument, image dimensions, resolution, software version and parameters, timestamp) and further statistical parameters on CPO (regelungsgrad, concentration parameter, spherical aperture, eigenvector angles) | ||
| 19 | Image, ice core | IMAGE ice core | Weikusat, Ilka | Section false-color image showing the microstructure (segmented grains, grain boundary network) and crystal orientation by color, available as PNG file. Resolution for images is 500 px/cm. Colorcode for the false-color images is provided under "Further details". |
License:
Creative Commons Attribution-ShareAlike 4.0 International (CC-BY-SA-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1188 data points