Processed line aerogravity data over the Thwaites Glacier region (2019/20 season) ...

• Main Authors: Jordan, Tom, Robinson, Carl
• Format: Dataset
• Language: English
• Published: NERC EDS UK Polar Data Centre 2021
• Subjects: "EARTH SCIENCE","CRYOSPHERE","GLACIERS/ICE SHEETS"; "EARTH SCIENCE","SOLID EARTH","GRAVITY/GRAVITATIONAL FIELD"; Antarctica; Geophysics; FOS Earth and related environmental sciences; Gravity; ITGC; Thwaites Glacier; Antarctic; Antarc*; British Antarctic Survey; Ice Sheet
• Online Access: https://dx.doi.org/10.5285/af14076f-f0c4-479f-b38f-6aa0b7c7d314; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01323

As part of the International Thwaites Glacier Collaboration (ITGC) ~9540 km of new airborne gravity data was acquired by the British Antarctic Survey, including ~6200 km over the Thwaites Glacier catchment. Data was collected using an iCORUS strap-down airborne gravimeter system mounted on the BAS aerogeophysical equipped survey aircraft VP-FBL. The survey operated from Lower Thwaites Glacier camp, and focused on collecting data between 70 and 180 km from the grounding line. Additional profiles from the coast to the Western Antarctic Ice Sheet (WAIS) divide and over the eastern shear margin were also flown. Navigation, aircraft attitude, sensor temperature, initial and levelled free air gravity anomalies are provided as an ASCI table. 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 Geophysics team. ... : The ITGC aerogeophysical survey relied on an iCORUS strap-down airborne gravimeter system. This high specification IMU was mounted in a thermally stabilised enclosure close to the centre of mass of the survey aircraft. GNSS and IMU data were recorded to a windows tablet PC for post processing. Post processing used base-station free Precise Point Positioning (PPP) implemented in the Terrapos GNSS processing software. This software uses a Kalman filtering approach to simultaneously solve for position, attitude and the Earth's gravity field (output as a free air anomaly). As no GNSS base station is used ionosphere corrections are derived from published global solutions available ~1 month after the survey. Due to operational procedures system temperature varied by up to 6 degrees, within the main survey area. However, temperature stabilisation meant that temperature generally varied by less than 1 degree for much of the survey. Comparison of errors and sensor temperature did not find a strong correlation, so a ...