Bathymetry of the Antarctic continental shelf and ice shelf cavities from a 3D inversion of circumpolar gravity anomalies constrained by other data

Bathymetry critically influences the intrusion of warm Circumpolar Deep Water onto the continental shelf and ice shelf cavities in Antarctica, thereby forcing ice melting, grounding line retreat, ice discharge and sea level rise. We present a novel and comprehensive bathymetry of Antarctica that includes all its ice shelf cavities and previously uncovered continental shelf areas. The new map is based on a 3D inversion of a circumpolar compilation of gravity anomalies constrained by measurements from the International Bathymetry Chart of the Southern Ocean, BedMachine Antarctica, and discrete seafloor measurements from seismic and ocean robotic probes. Previously unknown troughs with deeper ice shelf cavities are revealed in many parts of Antarctica, especially East Antarctica. The greater depths of troughs on the continental shelf and ice shelf cavities imply that many glaciers are more vulnerable to ocean subsurface warming than previously thought, which will impacts the projections of...,
AntGG gravity data. Ground-based and airborne Antarctic gravity measurements have been compiled in the frame of the International Association of Geodesy (IAG) Sub-Commission 2.4f “Gravity and Geoid in Antarctica” (AntGG) led by one of the co-authors (MS). A first Antarctic-wide compilation of consistently combined and gridded gravity anomalies (AntGG2016) was published by Scheinert et al 2016a. Since then, a number of new gravity data sets have been made available, especially over regions where in-situ data were sparse or missed at all, e.g. in the South Pole region (Forsberg et al., 2017), in Dronning Maud Land, East Antarctica (Eagles et al., 2018a), over the Pensacola Basin (Paxman et al., 2019a) or in Marie Byrd Land, West Antarctica (Young et al., 2017). Applying an improved processing and taking all available in-situ gravity data into account –- both data already incorporated in AntGG2016 and new data –- the new AntGG compilation features several advantages: the grid resolution i..., , # Bathymetry of the Antarctic continental shelf and ice shelf cavities from a 3D inversion of circumpolar gravity anomalies constrained by other data

## Description of the data and file structure

All the data are geocoded TIFF (geoTIFF) in Polar Stereographic format, with a coordinate reference system (CRS) EPSG:3031, 500 meters posting, 13333 columns x 13333 rows. The left corner origin is at  x = -3333250.00 meters, and y = 3333250.00 meters.

1. BED_ANTGG2022.tif: Bed elevation (meters) below sea level, float, -8024 to +4042 meters.
2. ERRBED_ANTGG2022.tif: Error in bed elevation (meters), float, 0 to 1000 meters.
3. MASK_ANTGG2022.tif: Ocean/ice/land mask, byte, 0-5, ocean (0); ice-free land (1); grounded ice (2); floating ice (3); Lake Vostok (4).
4. MASK_inv_ANTGG2022.tif: Gravity inversion data/BedMachine data, byte, 0-1.
5. SOURCE_ANTGG2022.tif: Input data to constrain inversion before filtering, byte, 0 to 8: 1) MEOP; 2) Singlebeam; 3) Multibeam; 4) Mass conservation; 5) Rada...