Stable water isotopes in snow from a regular sampling of the upper 10 cm at the EastGRIP deep drilling site during the 2018 summer season

• Main Authors: Zuhr, Alexandra, Wahl, Sonja, Steen-Larsen, Hans Christian, Faber, Anne-Katrine, Behrens, Melanie, Zolles, Tobias, Meyer, Hanno, Gkinis, Vasileios, Weiner, Mikaela, Sporr, Sina, Laepple, Thomas
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: AWI_SPACE; AWI Arctic Land Expedition; DATE/TIME; Day of the year; DEPTH; ice/snow; relative; Depth layer; Deuterium excess; standard deviation; EGRIP_2018_snow; GL-Land_2018_EGRIP; Greenland; POINT DISTANCE from start; Position; Sample code/label; Signals from the Surface Snow: Post-Depositional Processes Controlling the Ice Core Isotopic Fingerprint; SNOWISO; Snow pits/firn core/ice core; Space-time structure of climate change @ AWI; stable water isotopes; surface snow; δ18O; water; δ Deuterium; Alfred Wegener Institute; Climate change; ice core; Ice Sheet; The Cryosphere
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.956626; https://doi.org/10.1594/PANGAEA.956626

Snow samples of the upper 10 cm were taken between 14 May and 3 August 2018 next to the EastGRIP deep drilling site in northeast Greenland situated in the accumulation zone of the Greenland Ice Sheet. All samples were measured for their stable water isotope composition (δ18O, δD, d-excess). Samples were taken at 30 positions along a 39 m long transect. The first 20 samples had a spacing of 1 m and the remaining 10 samples had a spacing of 2 m. Sampling was performed every third day for three depth intervals (0-1 cm, 1-4 cm, 4-10 cm) with two one-week periods with daily sampling. The first period was from 8 to 14 June with a sampling of six depth intervals (0-1 cm, 1-2 cm, 2-4 cm, 4-6 cm, 6-8 cm, 8-10 cm) at ten locations (4 m spacing). The second period was from 24 to 30 July with a sampling of six depth intervals (0-0.5 cm, 0.5-1 cm, 1-2 cm, 2-4 cm, 4-6 cm, 6-10 cm) at 25 positions (position 1 - 10 with 1 m spacing, afterwards 2 m spacing). The depth indication in the data set always refers to the mean of each sampling interval. All samples were airtightly stored in high-purity sampling bags (®Whirl-Paks) and kept frozen until measurement. In the same area, a photogrammetry structure-from-motion approach was performed to generate digital elevation models for each day (Zuhr et al., 2022: https://doi.org/10.5194/tc-15-4873-2021, https://doi.org/10.1594/PANGAEA.936082, https://doi.org/10.1594/PANGAEA.923418). Thus, every sampling position has a depth indication, relative to the snow height of the entire transect. About 70 % of the samples were measured in the ISOLAB Facility at the Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, Potsdam, Germany. The samples were measured with an L2140-i CRDS device from Picarro Inc. with a high-throughput vaporizer. All data were corrected for memory and instrumental drift and calibrated on the VSMOW-SLAP scale following van Geldern and Barth (2012) using the calibration algorithm described in Münch et al. (2016). The mean measurement uncertainty for δ18O ...