This dataset contains airborne radar data acquired using the AWI ultra-wideband microwave radar (UWBM) during the Arctic season of 2019 (2.-10. April 2019). The profiles extend over sea ice in the Lincoln Sea and Nansen Sound in the Arctic Ocean and overlap with the measurements in the Beaufort Sea in 2017. The survey flights were performed as part of the ICESat-2 Validation Data Acquisition and IceBird 2019 Winter campaign. The data were utilized to derive snow freeboard and snow depth measurements. The AWI UWBM radar operated in a quad-polarized high-resolution mode. The data are available as netCDF files (including waveforms and metadata), KML files of the profile line locations, and quicklook images of the radargrams. For every profile we provide four radar products (img_01, img_02, img_03, img_04), which correspond to the four polarizations (VV, VH, HH, HV).

Project: IceBird 2019 WinterRegion: Beaufort, Sea, Lincoln Sea and Nansen Sound in the Arctic OceanData Owner/Correspondence:Christian Haas (Alfred Wegener Institut Bremerhaven, Germany), Contact: christian.haas@awi.deStefan Hendricks (Alfred Wegener Institut Bremerhaven, Germany), Contact: stefan.hendricks@awi.deVeit Helm (Alfred Wegener Institut Bremerhaven, Germany), Contact: veit.helm@awi.deInstrument used: AWI UWBMData products: CSARP_qlook (unfocussed)Method of navigation : GPS data was acquired by four NovAtel DL-V3 GPS receivers operating at 20Hz--The four radar products correspond to the following polarizations:img_01 = VVimg_02 = VH (V receiver, H transmit)img_03 = HHimg_04 = HV (H receiver, V transmit)--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