/* DATA DESCRIPTION: Citation: Painer, Florian; Drury, Martyn R; Hamers, Maartje F; Weikusat, Ilka (2026): Electron Backscatter Diffraction analysis on air hydrates of the EDML ice core [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.992544 (DOI registration in progress) 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. This dataset presents the first Electron Backscatter Diffraction (EBSD) measurements on air hydrates included in the EDML ice core. The sample was originally located at 2045.3 m depth. EBSD is a technique to characterize the microstructure of materials, which includes the precise determination of crystallographic orientations of measured materials. The measurements were taken by Florian Painer, Martyn Drury and Maartje Hamers at the University of Utrecht. The aim was to investigate the crystallographic nature and measure the crystallographic orientation of air hydrates included in polar ice. We thank Eric Hellebrand and Erik Betz-Güttner for their support in operating the Cryo-SEM. Access to the Cryo-SEM at MINT-UU (Utrecht University) was provided by EPOS-NL Facility Access, supported by the Dutch Research Council (NWO). Keyword(s): air hydrates; Antarctica; Cryo-SEM; EBSD analysis; Ice core Related to: Weikusat, Ilka; de Winter, Niels J; Pennock, Gillian M; Hayles, Michael F; Schneijdenberg, Chris T W M; Drury, Martyn R (2011): Cryogenic EBSD on ice: preserving a stable surface in a low pressure SEM. Journal of Microscopy, 242(3), 295-310, https://doi.org/10.1111/j.1365-2818.2010.03471.x Funding: Horizon 2020 (H2020) (URI: https://ec.europa.eu/programmes/horizon2020/), grant/award no. 955750: Research and training network on understanding Deep icE corE Proxies to Infer past antarctiC climatE dynamics (DEEPICE) (URI: doi:10.3030/955750) Coverage: LATITUDE: -75.002500 * LONGITUDE: 0.068400 DATE/TIME START: 2024-05-02T13:53:00 * DATE/TIME END: 2024-05-02T15:58:00 MINIMUM ELEVATION: 2891.7 m * MAXIMUM ELEVATION: 2891.7 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 (URI: https://doi.org/10.17815/jlsrf-2-152) * METHOD/DEVICE: EPICA drill (EDRILL) * COMMENT: Elevation is given with reference to WGS84 Parameter(s): Sample code/label (Sample label) * PI: Painer, Florian (florian.painer@awi.de) DATE/TIME (Date/Time) * GEOCODE * PI: Painer, Florian (florian.painer@awi.de) Temperature, device [°C] (T Device) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: Cryo Preparation System, Quorum Technologies, PP3010 * COMMENT: cold stage temperature of scanning electron microscope (SEM) Image (IMAGE) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: Scanning electron microscope (SEM), Zeiss, Gemini 450 * COMMENT: SEM image Site (Site) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: EBSD site Point ID (Point ID) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: EBSD point Phase (Phase) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments Angle [deg] (Angle) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: Euler angle 1 (Z) Angle [deg] (Angle) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: Euler angle 2 (X') Angle [deg] (Angle) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: Euler angle 3 (Z'') Image (IMAGE) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: EBSD pattern Image (IMAGE) * PI: Painer, Florian (florian.painer@awi.de) * METHOD/DEVICE: AZtec software, Oxford Instruments * COMMENT: EBSD pattern indexed Comment (Comment) * PI: Painer, Florian (florian.painer@awi.de) License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 373 data points Files: All files referred to in data matrix can be downloaded in one go as ZIP or TAR (PANGAEA user account required). To download single files, use the filename from data matrix appended to "https://download.pangaea.de/dataset/992544/files/". */ Sample label Date/Time T Device [°C] (cold stage temperature of sca...) IMAGE (SEM image, Scanning electron ...) Site (EBSD site, AZtec software, Ox...) Point ID (EBSD point, AZtec software, O...) Phase (AZtec software, Oxford Instru...) Angle [deg] (Euler angle 1 (Z), AZtec soft...) Angle [deg] (Euler angle 2 (X'), AZtec sof...) Angle [deg] (Euler angle 3 (Z''), AZtec so...) IMAGE (EBSD pattern, AZtec software,...) IMAGE (EBSD pattern indexed, AZtec s...) Comment EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 21 Air clathrate hydrate sII 254.86 23.16 32.93 EBSD_Site3_Point21.png EBSD_Site3_Point21_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 22 Air clathrate hydrate sII 60.03 47.55 50.78 EBSD_Site3_Point22.png EBSD_Site3_Point22_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 28 Air clathrate hydrate sII 59.95 47.43 50.14 EBSD_Site3_Point28.png EBSD_Site3_Point28_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 29 Air clathrate hydrate sII 59.92 48.13 51.25 EBSD_Site3_Point29.png EBSD_Site3_Point29_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 31 Air clathrate hydrate sII 60.07 47.88 50.65 EBSD_Site3_Point31.png EBSD_Site3_Point31_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 34 Air clathrate hydrate sII 252.15 23.57 36.33 EBSD_Site3_Point34.png EBSD_Site3_Point34_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 36 Air clathrate hydrate sII 60.10 47.66 49.89 EBSD_Site4_Point36.png EBSD_Site4_Point36_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 38 Air clathrate hydrate sII 251.91 23.50 36.01 EBSD_Site4_Point38.png EBSD_Site4_Point38_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 39 Air clathrate hydrate sII 60.58 47.94 50.34 EBSD_Site4_Point39.png EBSD_Site4_Point39_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 40 Air clathrate hydrate sII 61.61 47.75 49.22 EBSD_Site4_Point40.png EBSD_Site4_Point40_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 41 Air clathrate hydrate sII 60.02 48.08 50.85 EBSD_Site4_Point41.png EBSD_Site4_Point41_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 42 Air clathrate hydrate sII 60.38 47.06 49.87 EBSD_Site4_Point42.png EBSD_Site4_Point42_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 4 43 Air clathrate hydrate sII 253.13 23.19 34.51 EBSD_Site4_Point43.png EBSD_Site4_Point43_indexed.png EDML_2046_3_1 2024-05-02T15:07:00 -90 2046_3_1_075.tif 7 110 Air clathrate hydrate sII 176.49 27.07 45.22 EBSD_Site7_Point110.png EBSD_Site7_Point110_indexed.png EDML_2046_3_1 2024-05-02T15:25:00 -80 2046_3_1_082.tif 8 118 Air clathrate hydrate sII 291.13 37.85 17.43 EBSD_Site8_Point118.png EBSD_Site8_Point118_indexed.png EDML_2046_3_1 2024-05-02T15:25:00 -80 2046_3_1_082.tif 8 120 Air clathrate hydrate sII 291.94 37.43 16.11 EBSD_Site8_Point120.png EBSD_Site8_Point120_indexed.png EDML_2046_3_1 2024-05-02T15:25:00 -80 2046_3_1_082.tif 8 122 Air clathrate hydrate sII 291.64 37.57 16.60 EBSD_Site8_Point122.png EBSD_Site8_Point122_indexed.png EDML_2046_3_1 2024-05-02T15:40:00 -80 2046_3_1_087.tif 11 183 Air clathrate hydrate sII 61.34 48.09 49.22 EBSD_Site11_Point183.png EBSD_Site11_Point183_indexed.png EDML_2046_3_1 2024-05-02T15:40:00 -80 2046_3_1_087.tif 11 185 Air clathrate hydrate sII 254.00 22.51 34.39 EBSD_Site11_Point185.png EBSD_Site11_Point185_indexed.png EDML_2046_3_1 2024-05-02T15:40:00 -80 2046_3_1_087.tif 11 186 Air clathrate hydrate sII 253.88 22.94 34.15 EBSD_Site11_Point186.png EBSD_Site11_Point186_indexed.png EDML_2046_3_1 2024-05-02T15:40:00 -80 2046_3_1_087.tif 11 188 Air clathrate hydrate sII 254.86 23.18 33.58 EBSD_Site11_Point188.png EBSD_Site11_Point188_indexed.png EDML_2046_3_1 2024-05-02T15:40:00 -80 2046_3_1_087.tif 11 194 Air clathrate hydrate sII 248.98 23.80 39.08 EBSD_Site11_Point194.png EBSD_Site11_Point194_indexed.png EDML_2046_3_1 2024-05-02T15:40:00 -80 2046_3_1_087.tif 11 195 Air clathrate hydrate sII 253.87 23.34 34.35 EBSD_Site11_Point195.png EBSD_Site11_Point195_indexed.png EDML_2046_3_1 2024-05-02T15:56:00 -70 2046_3_1_093.tif 12 203 Air clathrate hydrate sII 293.14 38.04 14.97 EBSD_Site12_Point203.png EBSD_Site12_Point203_indexed.png EDML_2046_3_1 2024-05-02T15:56:00 -70 2046_3_1_093.tif 12 206 Air clathrate hydrate sII 292.01 37.03 16.09 EBSD_Site12_Point206.png EBSD_Site12_Point206_indexed.png EDML_2046_3_1 2024-05-02T15:56:00 -70 2046_3_1_093.tif 12 208 Air clathrate hydrate sII 291.60 36.10 16.93 EBSD_Site12_Point208.png EBSD_Site12_Point208_indexed.png EDML_2046_3_1 2024-05-02T15:56:00 -70 2046_3_1_093.tif 12 220 Air clathrate hydrate sII 175.99 27.31 46.79 EBSD_Site12_Point220.png EBSD_Site12_Point220_indexed.png EDML_2046_3_1 2024-05-02T15:58:00 -70 2046_3_1_094.tif 13 243 Air clathrate hydrate sII 172.34 28.02 49.91 EBSD_Site13_Point243.png EBSD_Site13_Point243_indexed.png EDML_2046_3_1 2024-05-02T15:58:00 -70 2046_3_1_094.tif 13 239 Air clathrate hydrate sII EBSD_Site13_Point239.png EBSD_Site13_Point239_indexed.png Euler angle measurements were unforunately lost during data backup. This pattern might indicate a different orientation which could not be resolved yet. EDML_2046_3_1 2024-05-02T13:53:00 -110 2046_3_1_052.tif 1 2 Hexagonal ice 15.04 90.41 4.27 EBSD_Site1_Point2.png EBSD_Site1_Point2_indexed.png EDML_2046_3_1 2024-05-02T13:53:00 -110 2046_3_1_052.tif 1 5 Hexagonal ice 170.01 98.17 58.18 EBSD_Site1_Point5.png EBSD_Site1_Point5_indexed.png EDML_2046_3_1 2024-05-02T13:53:00 -110 2046_3_1_052.tif 1 6 Hexagonal ice 102.29 140.01 59.36 EBSD_Site1_Point6.png EBSD_Site1_Point6_indexed.png EDML_2046_3_1 2024-05-02T13:53:00 -110 2046_3_1_052.tif 1 7 Hexagonal ice 122.25 91.40 41.97 EBSD_Site1_Point7.png EBSD_Site1_Point7_indexed.png EDML_2046_3_1 2024-05-02T14:54:00 -90 2046_3_1_069.tif 3 26 Hexagonal ice 15.94 91.94 4.57 EBSD_Site1_Point1.png EBSD_Site1_Point1_indexed.png Representative EBSD pattern and indexing