10.1594/PANGAEA.968088Neudert, MaraMaraNeudertAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenArndt, StefanieStefanieArndt0000-0001-9782-3844Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPANGAEA2025AFINAtka BayDFG-SPP1158Sea iceSub-ice platelet layerLATITUDELONGITUDEDATE/TIMEDistanceSignal strengthSea ice and snow thicknessSea ice and snow conductivitySub-ice platelet-layer conductivitySub-ice platelet-layer thicknessGround-based Electromagnetic Induction Sounding DeviceMulti-frequncy inversion, modified framework of the EMagPy (McLachlan et al., 2020)ANT-Land_2022_AFINNEUMAYER IIIAntarctic Fast Ice Network (AFIN)Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas (SPP1158)Sea Ice Physics @ AWI (AWI_SeaIce)2022-12-06T11:16:16/2022-12-06T19:33:59Dataset10.1594/PANGAEA.96804110.1190/geo2015-0130.110.1002/2015GL06507410.1016/j.cageo.2020.1045611137375 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThe snow+ice thickness (distance from the snow surface to the consolidated ice-platelet ice interface) and the underlying platelet ice thickness was measured by the electromagnetic induction (EM) method. On all transects, we used a multi-frequency EM instrument sensor (GEM-2 by Geophex Ltd) towed on a small sled behind a snowmobile (Hunkeler et al, 2016b). 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 multi-frequency sensor that can transmit multiple configurable frequencies in the kHz range simultaneously. The sensor setup during AFIN used 5 frequencies with an approximately logarithmic spacing throughout the frequency range of the sensor (1.53, 5.31, 18.33, 63.03, and 93.09 kHz). The transect measurements are based on a sensor calibration, where the GEM-2 was placed in a zero-conductivity environment on the ice shelf before and after each transect to correct for signal offsets in instrument drift. The snow+ice and platelet ice thickness and conductivity retrieval of the calibrated GEM-2 surveys data was done by multi-frequncy inversion in the modified framework of the EMagPy (McLachlan et al., 2020) accounting for the bucking coil bias (Hunkeler at al., 2016a). To validate the retrieved thicknesses, we used the snow depth, ice thickness and platelet ice thickness from the drill hole measurements coincident with the GEM-2 transects. The coincident drill hole data can be found here: doi:10.1594/PANGAEA.968459. For more details we refer to the paper by Neudert et al, 2024: Improved sub-Ice Platelet Layer Mapping with multi-frequency EM Induction Sounding, in review at Journal of Applied Geophysics, Elsevier.-8.136683260999973-7.8238966700000105-70.68372962-70.55233888AntarcticaGerman Research Foundationhttps://doi.org/10.13039/5011000016595472008Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas