Processed line aeromagnetic data over the Thwaites glacier region (2018/19 season) ...
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 as part of the International Thwaites Glacier Collaboration (ITGC). Data were collected using a caesium magnetometer system,...
| Main Authors: | , , |
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| Format: | Dataset |
| Language: | English |
| Published: |
UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation
2020
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5285/776612d1-573c-49c4-aff5-23b0fba48271 https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01240 |
| Summary: | 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 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 (http://admap.kopri.re.kr/ADMAP-2_SCR_27Aug13.pdf). Across flow flights were generally flown at a constant altitude ~450 m above the ice surface, but data was also collected along draped sections flown along the ice flow direction. In total 9872 km of data is presented, of this 6033 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 in ASCII file format (.xyz). ... : PROCESSING: Raw line aeromagnetic data from the 2018/19 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 survey. Diurnal variations in the magnetic field were recorded at 30 second intervals using two base stations, one at the Lower Thwaites Glacier field camp, and a second temporary station at the Beamish Drill camp on the Rutford Ice Stream. 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. The Beamish base station was used to correct the initial input flight and the Lower Thwaites Glacier base station was used to ... |
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