ALBERT

Description: Processed GNSS data of six stations at a basal melt channel of the southern Filchner Ice Shelf, Antarctica near the Support Force Glacier between 2015 and 2017. Five short-period GPS were located at a cross-section of the channel, located east outside the channel (GPS_oe), at the eastern steepest flank of the surface depression (GPS_se), within the channel at the lowest surface depression (GPS_low), at the western steepest flank (GPS_sw) and west outside the channel (GPS_we). All five GPS operated for 9 to 13 days with a measuring interval of 15 seconds (GPS_oe, GPS_se, GPS_sw, GPS_low) or 1 second (GPS_ow). The long-period GPS (GPS_se_long) operated at the steepest eastern flank of the channel for 103 days with a measuring interval of 15 seconds. The short-period GPS were operated parallel to an autonomous phase-sensitive radar (ApRES, see doi:10.1594/PANGAEA.932413) intended to measure basal melt rates. The GNSS data were processed using the Waypoint GravNav 8.8 processing software. We applied kinematic PPP processing using precise satellite orbits and clocks. The site coordinates are computed in the IGS14 frame and converted to WGS84 during data export at 15 seconds interval. To avoid jumps between daily solutions of the Waypoint PPP product, as the data is recorded in daily files, we merged three successive files prior to processing to enable full day overlaps. In a second step, the 3-day solutions are combined using relative point to point distances. To avoid edge effects, we combined the files in the middle of each 1-day overlap and removed outliers. The data were re-sampled to 1 min interval.