Here we present data from sled based multi-frequency electro magnetic induction measurements (GEM-2, Geophex Ltd.) for all ice stations visited during the ArcWatch-2 (PS144) Polarstern Expedition to the central Arctic Ocean. Between 2024-08-16 and 2024-09-26 Polarstern was moored to 10 larger ice floes on which the GEM-2 surveys were conducted. Prior to each survey the device was calibrated using a standardized procedure (e.g. Itken et al., 2023). The GEM-2 measures the distance from the snow surface to the ice–ocean interface resulting in a total ice+snow thickness estimate. We therefore included additional snow thickness measurements from a Magnaprobe device carried out along the same transects as the GEM-2 measurements. Both datasets were drift corrected and referenced to local GNSS stations employed at each ice station (Neckel et al., 2025).

The csv files contain ice thickness data averaged in 1 m-intervals along track and the closest snow thickness measurements.Columns include:time,latitude, latitude, x, y: coordinates of actual measurement in EPSG:4326 and EPSG:3413,lat_corr, lon_corr, x_corr, y_corr: coordinates corrected for floe drift with respect to a reference time,f1525Hz_hcp_i - f93075Hz_hcp_q (m): ice thickness estimates based on inphase or quadrature of different frequencies, snow_depth (m): closest measurement from separate the Magnaprobe, distance_to_snow_meas (m): distance to snow thickness measurement.