Snow and ice thickness measurements from Terrestrial Laser Scanning, Magnaprobe and GEM-2 on ice stations PS81/503, PS81/506 and PS81/517 from Weddell Sea, Antarctica, 2013 ...

• Main Authors: Wever, Nander, White, Seth, Hunkeler, Priska A, Maksym, Ted, Leonard, Katherine C
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2021
• Subjects: ice thickness; Sea ice; snow depth; spatial variability; Antarctic; Austral; Sturm; The Antarctic; Weddell; Weddell Sea; Wever; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.933584; https://doi.pangaea.de/10.1594/PANGAEA.933584

Spatial snow and ice thickness measurements from ice stations PS81/503, PS81/506 and PS81/517 from Research Vessel Polarstern in the Antarctic Weddell Sea in austral winter 2013 (cruise leg ANT-XXIX/6, AWECS campaign). Terrestrial laser scanning (TLS) was used to determine the snow surface height above sea level for an approximately 50x50m patch. The reference to sea level was obtained using registration targets drilled through the ice with a measured distance between the target and the water level in the drill holes. Magnaprobe measures snow depth (Sturm et al., 2018) and the GEM-2 instrument measures the combined snow and ice thickness (Hunkeler et al., 2016). Magnaprobe and GEM-2 was performed inside the laser scan field after all scans had been acquired. Additionally floe-scale walks were performed using Magnaprobe and GEM-2 to capture variability on a larger scale than the laser scan field. Further information can be found in Wever et al. (2021). ... : Summary: ======== (1) snow surface above sea level from Terrestrial Laser Scanning (TLS) (2) snow depth from Magnaprobe (MP), see Sturm and Holmgren (2018) for details. (3) combined snow and ice thickness from a multifrequency electromagnetic induction instrument (GEM-2), see Hunkeler et al. (2015) for details. For each floe, two sets of measurements were performed: (1) in a designated area, terrestrial laser scanning (TLS), magnaprobe, and GEM-2 was used to map snow and ice thickness in high spatial resolution. (2) to sample a larger area, a floe-scale walk (FSW) was performed using Mangaprobe and GEM-2.---Coordinates:============X and Y coordinates are relative to a GPS base station installed on each floe. Coordinates were determined using post-processing kinematic GPS (PPK-GPS), and corrected for floe ration and drift. Coordinates of measurements inside the laser scanning area were particularly carefully processed to collocate measurements as accurately as possible (within a few cm). The vertical height ...