GEM-2 quicklook total thickness measurements from the 2019-2020 MOSAiC expedition ...

• Main Authors: Hendricks, Stefan, Itkin, Polona, Ricker, Robert, Webster, Melinda, von Albedyll, Luisa, Rohde, Jan, Raphael, Ian, Jaggi, Matthias, Arndt, Stefanie
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Arctic; electromagnetic induction; GEM-2; ice; magnaprobe; MOSAiC20192020; ocean; Sea ice mass balance; Sea ice thickness; snow depth; transect; Broadband electromagnetic sensor; PS122/1; PS122/2; PS122/3; PS122/4; PS122/5; Polarstern; Arctic Research Icebreaker Consortium A strategy for meeting the needs for marine-based research in the Arctic ARICE; Multidisciplinary drifting Observatory for the Study of Arctic Climate MOSAiC; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.943666; https://doi.pangaea.de/10.1594/PANGAEA.943666

The total snow and ice thickness (distance from the snow surface to the ice-ocean interface) was measured by the electromagnetic induction (EM) method. On MOSAiC transects, we used a broad-band EM instrument sensor (GEM-2 by Geophex Ltd) towed on a small sled (Hunkeler et al, 2015; Hunkeler et al, 2016). The instrument includes a real-time data processing unit including a GPS receiver which communicates with a pocket PC that is operates the sensor and records the EM and GPS data streams.The GEM-2 is a broadband sensor that can transmit multiple configurable frequencies in the kHz range simultaneously. The sensor setup during MOSAiC used 5 frequencies with an approximately logarithmic spacing throughout the frequency range of the sensor (1.525 kHz, 5.325 kHz, 18.325 kHz, 63.025 kHz, and 93.075 kHz).The transect measurements are based on an empirical approach based on a sensor calibration, where the GEM-2 was placed at known heights above the sea ice surface using a wooden ladder on top of level ice with a ...