Snow stable water isotopes of a sublimation sampling scheme at the EastGRIP deep drilling site, summer season 2019 ...

• Main Authors: Hörhold, Maria, Behrens, Melanie, Wahl, Sonja, Faber, Anne-Katrine, Zuhr, Alexandra, Meyer, Hannah, Steen-Larsen, Hans Christian
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2022
• Subjects: EastGRIP; snow-air-exchange; snow samples; stable water isotopes; sublimation scheme; Ice drill; East Greenland Ice-core Project EGRIP; Polar Terrestrial Environmental Systems @ AWI AWI_Envi; Signals from the Surface Snow Post-Depositional Processes Controlling the Ice Core Isotopic Fingerprint SNOWISO; Greenland; Alfred Wegener Institute; East Greenland; East Greenland Ice-core Project; Greenland ice core; Greenland Ice core Project; ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.945566; https://doi.pangaea.de/10.1594/PANGAEA.945566

Snow samples were taken along a 90 m transect at the EastGRIP ice core deep drilling site perpendicular to the prevailing wind direction.The snow was collected after precipitation events from the very surface (0 - 0.5 cm) and from the top centimeter at 10 positions with 10 m spacing. The samples were shipped frozen to the Alfred-Wegener-Institute and stored at -25 °C. Prior to measurements the samples were melted in the sample bags at room temperature. For the measurement of the isotopic composition a Picarro L2120-i, a Picarro L2140-i and a Picarro L2130-i with a high-throughput vaporizer (model A0212) was used. The measurement set-up followed the Van-Geldern protocol (van Geldern and Barth, 2012). Each sample was injected four times and the standard deviation is computed. We calculate the average over all the standard deviations as a measure of uncertainty. We find this average to be 0.03 permil for δ18O (with stdev 0.02) and 0.13 permil for δD (stdev 0.11). The maximum standard deviation within the data ...