Painer, Florian; Weikusat, Ilka; Kipfstuhl, Sepp (2025): Summary of air hydrate properties of the EDML ice core [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.984580
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Published: 2025-09-08 • DOI registered: 2025-09-30
Abstract:
In the deeper part of polar ice sheets, air hydrates are the primary air inclusions. They trap most of the ancient air molecules used for paleoclimatic reconstructions in their crystal structure. Furthermore, their number and size was found to correlate with past climate. This dataset presents a summary of air hydrate parameters of the EPICA Dronning Maud Land (EDML) ice core from 1255 m to 2771 m depth. Air hydrate parameters were measured and analyzed in 74 ice thick section microphotographs using digital image analysis. The images were analyzed by Florian Painer at the Alfred Wegener Institute, Bremerhaven and the analysis routines were implemented in Python using open-source libraries. The aim was to develop a semi-automated analysis routine and to provide a high-resolution record of air hydrate properties of the EDML ice core. The microphotographs were obtained in the years 2002 - 2006 during the Antarctic field season, shortly after the sample was drilled, using an optical microscope (Kipfstuhl et al., 2006; Kipfstuhl, 2007).
Related to:
Painer, Florian; Kipfstuhl, Sepp; Drury, Martyn R; Uchida, Tsutomu; Freitag, Johannes; Weikusat, Ilka (preprint): Air clathrate hydrates in the EDML ice core, Antarctica. https://doi.org/10.5194/egusphere-2025-633
Painer, Florian; Weikusat, Ilka; Kipfstuhl, Sepp (2025): Raw data of air hydrate properties of the EDML ice core [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.984577
References:
Kipfstuhl, Sepp (2007): Thick-section images of the EPICA-Dronning-Maud-Land (EDML) ice core [dataset publication series]. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.663141
Kipfstuhl, Sepp; Hamann, Ilka; Lambrecht, Anja; Freitag, Johannes; Faria, Sérgio H; Grigoriev, Dimitri; Azuma, Nobuhiko (2006): Microstructure mapping: a new method for imaging deformation-induced microstructural features of ice on the grain scale. Journal of Glaciology, 52(178), 398-406, https://doi.org/10.3189/172756506781828647
Project(s):
Funding:
Fifth Framework Programme (FP5), grant/award no. EVK2-CT-2000-00077: European Project for Ice Coring in Antarctica
Fourth Framework Programme (FP4), grant/award no. ENV4980702: European Project for Ice Coring in Antarctica
Horizon 2020 (H2020), grant/award no. 955750: Research and training network on understanding Deep icE corE Proxies to Infer past antarctiC climatE dynamics (DEEPICE)
Coverage:
Latitude: -75.002500 * Longitude: 0.068400
Date/Time Start: 2001-01-10T00:00:00 * Date/Time End: 2006-01-17T00:00:00
Minimum DEPTH, ice/snow: 1255.0 m * Maximum DEPTH, ice/snow: 2770.9 m
Event(s):
EDML (EPICA Dronning Maud Land, DML28C01_00) * Latitude: -75.002500 * Longitude: 0.068400 * Date/Time Start: 2001-01-10T00:00:00 * Date/Time End: 2006-01-17T00:00:00 * Elevation: 2891.7 m * Recovery: 2774.15 m * Campaign: EPICA-Campaigns * Basis: Kohnen Station * Method/Device: EPICA drill (EDRILL) * Comment: Elevation is given with reference to WGS84
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Painer, Florian | |||
| 2 | Season | Season | Painer, Florian | time when the sample was drilled and / or imaged (Kipfstuhl, 2007) | ||
| 3 | DEPTH, ice/snow | Depth ice/snow | m | Painer, Florian | Geocode | |
| 4 | Category | Cat | Painer, Florian | segmentation category, defines the parameters used for the image segmentation routine | ||
| 5 | Density, optical as gray value | Density opt gray | Painer, Florian | median gray value of the image | ||
| 6 | Method comment | Method comm | Painer, Florian | sample thickness measured/estimated | ||
| 7 | Section thickness, minimum | Sec thick min | mm | Painer, Florian | from Kipfstuhl (2007) | |
| 8 | Section thickness | Sec thick | mm | Painer, Florian | from Kipfstuhl (2007) | mean |
| 9 | Section thickness, maximum | Sec thick max | mm | Painer, Florian | from Kipfstuhl (2007) | |
| 10 | Air hydrate, counts | AH cts | # | Painer, Florian | total segmented air hydrates per sample image | |
| 11 | Percentage | Perc | % | Painer, Florian | under segmentation; % of too little segmented air hydrates estimated from ground truth images | |
| 12 | Percentage | Perc | % | Painer, Florian | over segmentation; % of segmented artifacts estimated from ground truth images | |
| 13 | Air hydrate, counts, minimum | AH cts min | # | Painer, Florian | considering over segmentation | |
| 14 | Air hydrate, counts, maximum | AH cts max | # | Painer, Florian | considering under segmentation | |
| 15 | Air hydrate, number concentration | NAH | #/cm3 | Painer, Florian | ||
| 16 | Air hydrate, number concentration, minimum | NAH min | #/cm3 | Painer, Florian | ||
| 17 | Air hydrate, number concentration, maximum | NAH max | #/cm3 | Painer, Florian | ||
| 18 | Air hydrate, mean diameter | AH mean diam | pixel | Painer, Florian | ||
| 19 | Air hydrate mean diameter converted | AH mean diam | µm | Painer, Florian | converted from pixel | |
| 20 | Standard deviation, relative | Std dev r | % | Painer, Florian | of air hydrate diameter distribution | |
| 21 | Air hydrate, mean volume | AH mean vol | cm3 | Painer, Florian | mean volume of an air hydrate inclusion assuming a sphere | |
| 22 | Air hydrate, volume concentration | AH vol conc | cm3/cm3 | Painer, Florian | volume air hydrates / volume ice | |
| 23 | Air hydrate, air content, total | AH air tot | cm3/g | Painer, Florian | estimated from air hydrate volume concentration | |
| 24 | Air hydrate, median aspect ratio | AH median aspect r | Painer, Florian | |||
| 25 | Aspect ratio, 90% percentile | Aspect ratio 90 | Painer, Florian | 90% percentile of air hydrate aspect ratio distribution | ||
| 26 | Orientation | Orientation | deg | Painer, Florian | median absolute orientation of air hydrate major axis |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1850 data points