Processed line aeromagnetic data over the Thwaites glacier region (2019/2020 season) ...

• Main Authors: Jordan, Tom, Robinson, Carl
• Format: Dataset
• Language: English
• Published: NERC EDS UK Polar Data Centre 2021
• Subjects: "EARTH SCIENCE","SOLID EARTH","GEOMAGNETISM","MAGNETIC FIELD","MAGNETIC ANOMALIES"; "EARTH SCIENCE","CRYOSPHERE","GLACIERS/ICE SHEETS"; Antarctica; Geophysics; FOS Earth and related environmental sciences; ITGC; Magnetic; Thwaites Glacier; Antarctic; Antarc*; British Antarctic Survey
• Online Access: https://dx.doi.org/10.5285/eb6bf8df-ea87-4c3c-8f27-33fa8d5ac663; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01320

Aeromagnetic data provides important constraints on the sub-surface geology of a region. This dataset contains aeromagnetic line data collected by the British Antarctic Survey during the second aerogeophysical survey carried out as part of the International Thwaites Glacier Collaboration (ITGC). Data were collected using a caesium magnetometer system, and have been corrected to total field values following the approach laid out by the SCAR ADMAP working group (https://www.scar.org/science/admap/about/). In total 8688 km of data is presented, of this ~6052 km was collected in the main survey area, while other data was collected on input transit flights. The aircraft used was the BAS aerogeophysicaly equipped twin otter VP-FBL. Data are available as an ASCII table (.csv). The Thwaites 2019/20 aerogeophysical survey was carried out as part of the BAS National Capability contribution to the NERC/NSF International Thwaites Glacier Collaboration (ITGC) program. Data processing was supported by the BAS Geology and ... : Raw line aeromagnetic data from the December 2019 ITGC airborne survey were initially corrected for the regional geomagnetic field (IGRF), and compensated for aircraft motion. Compensation coefficients were calculated from a calibration flight flown ~500m above the Lower Thwaites Glacier field camp during the previous season, and are therefore not optimal. The dataset may benefit from a low pass filter to remove residual noise due to aircraft dynamic motion. Diurnal variations in the magnetic field were recorded at 30 second intervals using a base station at Lower Thwaites Glacier field camp. Base station corrections were calculated by subtracting the local mean base station value across the survey from the recorded base station values. The base station corrections were then filtered with a 30 minute filter to ensure short wavelength signals, likely only seen at the base station, were not transferred to the airborne dataset. No base correction was applied to any of the transits, or initial calibration ...