In December 2022 and January 2023, the Alfred Wegener Institute for Polar and Marine Research (AWI) and the German Federal Institute for Geosciences and Natural Resources (BGR) conducted an airborne campaign, designated "RIISERBATHY", at the Riiser-Larsen ice shelf, East Antarctica. 'RIISERBATHY' is part of the overarching "GEA" project (Geodynamic Evolution of East Antarctica). The principal objectives of the project are to determine the bathymetry beneath the shelf ice, to augment knowledge on the ice-ocean interactions in the project area and to facilitate geological interpretations. Two gravimeters were installed in a Basler BT-67 aircraft "Polar 5": a stable-platform GT-2A, owned by the AWI, and a strapdown gravimeter of the iMAR iNAV-RQH-1003 type, equipped with iTempStab-AddOn (iNAV), provided by the Technical University of Darmstadt. This dataset includes the iNAV gravity disturbance results along the approximately straight flight lines, as well as the normal gravity. The gravity can be calculated by summing up the corresponding gravity disturbance and normal gravity. The positions (WGS84) are given for the iNAV's centre of measurements, comprising geodetic latitude, longitude and height above the ellipsoid. Gravity disturbance results are given for low-pass filter lengths of 100 s and 130 s. The formal spatial resolutions (half wavelength) for the 100 s and 130 s solutions are 3.8 km and 4.9 km, respectively. In addition to the unadjusted results, which were only anchored to the reference gravity at the airfield, flight-wise levelled results are provided, where a single bias per flight is estimated using crossover point levelling. In a crossover evaluation, root mean square errors (RMSE) of 1.83 mGal (1.26 mGal) were obtained using the 100 s filter, and RMSE of 1.71 mGal (1.07 mGal) were obtained using the 130 s filter before (after) crossover levelling. Hence, the use of the levelled 130 s filter results (iNAV) is recommended. Related GT-2A gravity results, GNSS master tracks, magnetic data, radio echo sounding data, as well as ice base and surface picks are deposited within PANGAEA as well. More information on the RIISERBATHY processing and results of both gravimeters can be found in the associated article.

Campaign: P5-236_RIISERBATHY_22_23Mission PI: H. EisermannCorrespondence: johann@psg.tu-darmstadt.deInstrument used: gravity meter iMAR iNAV-RQH-1003 with iTempStab-AddOn