Ringel, Maximilian Harald; Spreen, Gunnar; Krumpen, Thomas; Neudert, Mara (2026): GEM-2 raw electromagnetic measurements of the ice floe transects during the PS149 CONTRASTS expedition at station PS149_41-1-gem2-730-iup-01 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996963 (DOI registration in progress), In: Ringel, MH et al. (2026): GEM-2 raw electromagnetic measurements of the ice floe transects during the PS149 CONTRASTS expedition (July-August 2025) [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996869 (DOI registration in progress)
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Published: 2026-09-02
Abstract:
This dataset contains the raw electromagnetic induction (EM) measurements from a walk with the GEM instrument on a sledge across the ice floe (called long transect) conducted during the PS149 CONTRASTS expedition. The measurements were acquired using the Geophex Ltd. GEM-2-730 broadband EM sensor. During each ice station of the expedition (i.e., floe visit), a long transect was traversed across the ice floe to obtain statistically representative distributions of snow/pond depth and ice thickness. Each transect was marked with flags at its corner points to ensure that a similar track was measured during repeated visits to each ice floe. This dataset provides only the raw GEM measurements acquired along the transect for the indicated ice station (see title), including in-phase and quadrature responses, as well as electrical conductivity and magnetic susceptibility of sea ice and snow / melt ponds. These raw data enable users to apply various processing methods to, e.g., derive sea ice thickness. The measurements conducted during the other ice stations as well as further technical details about the data can be found in the collection: https://doi.pangaea.de/10.1594/PANGAEA.996869.
Keyword(s):
Related to:
Nicolaus, Marcel (2026): The Expedition PS149 of the Research Vessel POLARSTERN to the Arctic Ocean in 2025. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 808, 382 pp, https://doi.org/10.57738/BZPM_0808_2026
Additional metadata:
General instrument specifications for GEM-2-730 in yaml format. gem2-730-seaice-default.yaml
PS149_41-1_floe3c_20250817_GEM730_LongTransect metadata in yaml format. PS149_41-1_floe3c_20250817_GEM730_LongTransect.yaml
Further details:
Calibration data and metadata for PS149_41-1_floe3c_20250817_GEM730. PS149_41-1_floe3c_20250817_GEM730_Calibration.zip
Project(s):
Arctic Amplification (AC3)
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS149_01: Sea Ice Physics (CONTRASTS)
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Median Latitude: 82.929375 * Median Longitude: -12.765166 * South-bound Latitude: 82.920736 * West-bound Longitude: -12.810919 * North-bound Latitude: 82.941457 * East-bound Longitude: -12.732632
Date/Time Start: 2025-08-17T12:38:57 * Date/Time End: 2025-08-17T14:54:55
Minimum ALTITUDE: 0.10 m * Maximum ALTITUDE: 10.40 m
Event(s):
PS149_41-1-gem2-730-iup-01 (File 113) * Latitude Start: 82.941457 * Longitude Start: -12.805320 * Latitude End: 82.920736 * Longitude End: -12.795865 * Date/Time Start: 2025-08-17T12:38:00 * Date/Time End: 2025-08-17T14:54:00 * O2A Registry URI: https://registry.o2a-data.de/items/12738 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Broadband electromagnetic sensor (BES) * Comment: Not logged in DShip. Long transect.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Ringel, Maximilian Harald | Geocode | ||
| 2 | LATITUDE | Latitude | Ringel, Maximilian Harald | Geocode | ||
| 3 | LONGITUDE | Longitude | Ringel, Maximilian Harald | Geocode | ||
| 4 | Line ID | Line ID | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | ||
| 5 | Record number | RN | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | ||
| 6 | Marker | Marker | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | ||
| 7 | Status | Status | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | Error staus code for Geophex processing software: 0-OK, 1-overload, 2-tx error,4-memory | |
| 8 | Quality flag, position | QF pos | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | GPS_status, 2 = WAAS differential corrected fix, 1 = floating fix, 0 = not position | |
| 9 | ALTITUDE | Altitude | m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | Geocode – GPS |
| 10 | Magnetic field, power-line frequency | Power line | nT | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | |
| 11 | In-phase component | In-phase | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 1525Hz |
| 12 | Quadrature component | Quadrature | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 1525Hz |
| 13 | In-phase component | In-phase | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 5325Hz |
| 14 | Quadrature component | Quadrature | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 5325Hz |
| 15 | In-phase component | In-phase | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 18325Hz |
| 16 | Quadrature component | Quadrature | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 18325Hz |
| 17 | In-phase component | In-phase | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 63025Hz |
| 18 | Quadrature component | Quadrature | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 63025Hz |
| 19 | In-phase component | In-phase | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 93075Hz |
| 20 | Quadrature component | Quadrature | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 93075Hz |
| 21 | Quadrature component, sum | Quadrature sum | ppm | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | |
| 22 | Conductivity, apparent | AppCond | mS/m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 1525Hz |
| 23 | Conductivity, apparent | AppCond | mS/m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 5325Hz |
| 24 | Conductivity, apparent | AppCond | mS/m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 18325Hz |
| 25 | Conductivity, apparent | AppCond | mS/m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 63025Hz |
| 26 | Conductivity, apparent | AppCond | mS/m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 93075Hz |
| 27 | Conductivity, apparent | AppCond | mS/m | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | Total apparent conductivity calculated by GEM2Exporter |
| 28 | Magnetic susceptibility, volume | kappa | 10-6 SI | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 1525Hz |
| 29 | Magnetic susceptibility, volume | kappa | 10-6 SI | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 5325Hz |
| 30 | Magnetic susceptibility, volume | kappa | 10-6 SI | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 18325Hz |
| 31 | Magnetic susceptibility, volume | kappa | 10-6 SI | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 63025Hz |
| 32 | Magnetic susceptibility, volume | kappa | 10-6 SI | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at 93075Hz |
| 33 | Magnetic susceptibility, volume | kappa | 10-6 SI | Ringel, Maximilian Harald | Ground-based Electromagnetic Induction Sounding Device, GEM-2, Geophex Ltd | at Total |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 1 (ProcLevel1)
Size:
535920 data points
Download Data
View dataset as HTML (shows only first 2000 rows)