This dataset contains airborne radar data acquired using the AWI EMR system (Nixdorf et al., 1999) during the Antarctic season of 2022/23. The airborne campaign 'RIISERBATHY' saw the acquisition of geophysical data across the Riiser-Larsen Ice Shelf in East Antarctica during the austral summer of 2022/2023, with Neumayer-III and Troll as base stations. It was jointly funded by the Alfred Wegener-Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany, and the Federal institute of Geosciences and Natural Resources, Hannover, Germany. Grant number of the Alfred Wegener Institute for this campaign is 'AWI_PA_02138'. 'RIISERBATHY' is part of the overarching 'GEA' project (Geodynamic Evolution of East Antarctica). Here, airborne radio-echo sounding data are deposited, acquired using the Aero EMR system described by Nixdorf et al. (1999). Related ice base and surface picks are deposited within PANGAEA as well [link/doi]. Related GNSS master tracks, and potential field data are deposited within PANGAEA as well and can be found using the PANGAEA identifier for this campaign, 'P5-236_RIISERBATHY_22_23' (https://www.pangaea.de/?q=campaign:%22P5-236_RIISERBATHY_22_23%22). The data are available as netCDF files (including waveforms and metadata), KML files of the profile line locations, and quicklook images of the radargrams.The ice penetrating radar system used operates with a centre frequency of 150 MHz and has been widely utilized in Antarctica since the mid-90s (Steinhage, 2001). An extensive description of the system is done by Nixdorf et al. (1999). During 'RIISERBATHY' it was flown in toggle mode, alternately acquiring data with both a short and a long pulse of 60 and 600 ns. This mode reduces horizontal resolution to 9.4 m at 70 m/s from 4.7 m, compared to operating in single-pulse mode, but allows to map internal layers with its short pulse and ice thicknesses of up to 4000 m with its long pulse (Steinhage, 2001).

Campaign: P5-236_RIISERBATHY_22_23Mission PI: H. EisermannContact persons for AWI Radio-echo sounding data: Daniel Steinhage (daniel.steinhage@awi.de), Veit Helm (veit.helm@awi.de), Olaf Eisen (olaf.eisen@awi.de)--Instrument used: Aero EMR (Nixdorf et al., 1999)Method of navigation : GPS data was acquired by four NovAtel DL-V3 GPS receivers operating at 20Hz--The netCDF files contain the following variables:altitude: Platform altitude (WGS84) in metersbed_elevation: Bed elevation for each trace (without applying a firn correction and permitivity of ice: 3.15) in metersbed_pick: picked Bed location for each trace, expressed as twt in seconds from time zerodata: Radar data (Values in dBm after DC conversion)data_agc: Scaled radar data using automatic gain control (AGC)distance: Along-track distance in metersice_thickness: Ice thickness for each trace (without applying a firn correction and permitivity of ice: 3.15) in meterslat: Latitude in decimal degrees (WGS84)lon: Longitude in decimal degrees (WGS84)range: Range between sensor and surface in metersspacing: Along-track trace to trace spacing in meterssurface: Surface elevation derived from radar (WGS84) in meterssurface_pick: Picked surface reflection in two-way travel time in secondstime: Seconds of daytwt: Two-way travel time (twt) in seconds