PANGAEA_968088 GEM-2 ice and platelet total thickness measurements for transect AFIN_ATKA_20221206 Neudert, Mara; Arndt, Stefanie GEM-2 ice and platelet total thickness measurements for transect AFIN_ATKA_20221206 2025-03-21 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.968088 Investigator Mara Neudert mneudert@awi.de Earth Science LATITUDE LONGITUDE DATE/TIME Distance Signal strength Sea ice and snow thickness Sea ice and snow conductivity Sub-ice platelet-layer conductivity Sub-ice platelet-layer thickness geoscientificInformation AFIN AFIN_ATKA_20221206 ANT-Land_2022_AFIN Atka Bay DFG-SPP1158 Ground-based Electromagnetic Induction Sounding Device Sea ice Sub-ice platelet layer Ground-based Electromagnetic Induction Sounding Device Multi-frequncy inversion, modified framework of the EMagPy (McLachlan et al., 2020) NEUMAYER III 2022-12-06 2022-12-06 Complete -70.68372962 -70.55233888 -8.136683260999973 -7.8238966700000105 AFIN Antarctic Fast Ice Network SPP1158 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas AWI_SeaIce Sea Ice Physics @ AWI unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 1137375 data points text/tab-separated-values Hunkeler, Priska A; Hendricks, Stefan; Hoppmann, Mario; Farquharson, Colin G; Kalscheuer, Thomas; Grab, Melchior; Kaufmann, Manuela S; Rabenstein, Lasse; Gerdes, Rüdiger (2016): Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking. Geophysics, 81(1), WA45-WA58, https://doi.org/10.1190/geo2015-0130.1 Hunkeler, Priska A; Hoppmann, Mario; Hendricks, Stefan; Kalscheuer, Thomas; Gerdes, Rüdiger (2016): A glimpse beneath Antarctic landfast sea ice: platelet-layer volume from multi-frequency electromagnetic induction sounding. Geophysical Research Letters, 43(1), 222-231, https://doi.org/10.1002/2015GL065074 McLachlan, Paul; Blanchy, Guillaume; Binley, Andrew (2021): EMagPy: Open-source standalone software for processing, forward modeling and inversion of electromagnetic induction data. Computers & Geosciences, 146, 104561, https://doi.org/10.1016/j.cageo.2020.104561

The 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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.968088"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME https://doi.org/10.1002/2015GL065074 A glimpse beneath Antarctic landfast sea ice: platelet-layer volume from multi-frequency electromagnetic induction sounding https://doi.org/10.1016/j.cageo.2020.104561 EMagPy: Open-source standalone software for processing, forward modeling and inversion of electromagnetic induction data https://doi.org/10.1190/geo2015-0130.1 Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking https://doi.org/10.17815/jlsrf-2-152 NEUMAYER III https://gepris.dfg.de/project/5472008 SPP1158 https://www.awi.de/en/science/climate-sciences/sea-ice-physics/projects/afin-antarctic-fast-ice-network.html AFIN https://www.awi.de/en/science/climate-sciences/sea-ice-physics.html AWI_SeaIce PANGAEA_968041 DIF 9.4 2025-03-21 2026-07-14