| Summary: | Progress Code: completed Statement: The vast majority of AXBT and AXCTD sensors successfully transmitted signals to the aircraft; however, a handful of sensors either did not transmit or transmitted noisy and likely uninterpretable data. An ongoing analysis effort attempts to increase confidence in the seafloor impact signal and the proper equations to use for depth, temperature, and salinity calculations. Updates to this metadata record will be submitted when improvements in data quality are achieved. Dates provided in temporal coverage are approximate only. Extracted Level 2 data include three data types: 1) Position data are included in .GPX files organized by campaign where “ICP8” refers to the 2016-2017 ICECAP2 field season and “ICP9” refers to the 2017-2018 field season. We recommend opening these files in QGIS or on similar platform. Metadata for each sonobuoy deployment include the unique identifier for each profile as well as the date, time, and aircraft longitude, latitude, elevation, and speed (in East, North, Up coordinates) at the time of deployment. Season identifier, flight number, and unique profile identifier are also displayed. In QGIS, for example, clicking on the drop locations using the “Identify Features” tool is a convenient way of investigating the metadata. 2) Profile data are released as Exportable Data Files (EDF), an ASCII format with a metadata header followed by the profile data. 3) Profile data are also released as Hierarchical Data Format (HDF) files using a .h5 extension. This format is provided so users can take advantage of numerous and freely available Python and MATLAB resources simplifying importing and investigating the profiles. Project 4346 demonstrated the use of Airborne eXpendable Bathy-Thermograph (AXBT) and Airborne eXpendable Conductivity, Temperature, Depth (AXCTD) sensors from a BT-67 Basler aircraft in East Antarctica. The primary objective was to use AXBT and AXCTD sensors to infer seafloor depth where no previous measurements had been made by ship, often by ...
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