Weikusat, Ilka; Stoll, Nicolas; Eichler, Jan; Kerch, Johanna; Kleitz, Ina; Jansen, Daniela; Shigeyama, Wataru; Homma, Tomoyuki; Bayer, Maddalena; Götz, Pia; Kuiper, Ernst-Jan N; Westhoff, Julien; Saruya, Tomotaka; Franke, Steven; Hellmann, Sebastian; Rathmann, Nicolas; Wallis, David; Cook, Eliza; Kipfstuhl, Sepp (2025): Crystal c-axes (fabric analyser G50) of ice core samples (vertical thin sections) collected from the polar ice core EGRIP, 111-2651 m depth [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.984220, 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: 2025-08-15 • DOI registered: 2025-08-15
Abstract:
Polarisation microscopy image data from vertical thin sections from the EGRIP ice core were acquired with a Fabric Analyser (G50, Russell-Head Instruments). 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 (approx. 250-300 µm thick, max. 7x9 cm²) 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). Sample folders are named according to the convention EGRIP<bag>\_<section>-<cut>\_<additional-info>. Data are not available between 2121 and 2417 m.
Each section folders contains a manually prepared mask image (background.bmp) in preparation for image processing to exclude image artefacts from the sample margins. The resolution of the image data is 500 px/cm. Quality images are provided by the instrument as well as images showing crystal c-axis orientation per pixel. The binary file (data.cis) contains all relevant information to evaluate the section with regard to the crystal-preferred orientation (CPO) of the ice thin sections.
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
Project(s):
East Greenland Ice-core Project (EGRIP)
Glaciology @ AWI (AWI_Glac)
Coverage:
Latitude: 75.630000 * Longitude: -35.980000
Minimum DEPTH, ice/snow: 111.56 m * Maximum DEPTH, ice/snow: 2650.36 m
Event(s):
Comment:
The sections 375_4, 1588_2 are measured top down. The data files of sections 505_4, 2726_1 are incomplete but can be processed and evaluated.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, ice/snow | Depth ice/snow | m | Weikusat, Ilka | Geocode | |
| 2 | Sample code/label | Sample label | Weikusat, Ilka | |||
| 3 | Binary Object | Binary | Weikusat, Ilka | |||
| 4 | Binary Object (File Size) | Binary (Size) | Bytes | Weikusat, Ilka |
Change history:
2025-09-04T07:14:27 – Correction: Author Julien Westhoff was added after being unintentionally omitted.
License:
Creative Commons Attribution-ShareAlike 4.0 International (CC-BY-SA-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
2304 data points
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