Antarctic ice sheet delineations to be used for the IMBIE assessment


Summary
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We provide delineations of the Antarctic ice sheet and its periphery into eighteen distinct drainage basins (A-Ap, Ap-B, B-C, C-Cp, Cp-D, D-Dp, Dp-E, E-Ep, Ep-F, F-G, G-H, H-Hp, Hp-I, I-Ipp, Ipp-J, J-Jpp, Jpp-K, K-A) to be used by all participants for the IMBIE assessment to allow for comparisons of ice sheet mass balance over common spatial domains
This shapefile is based on the Rignot Antarctic Drainage Basins (Rignot et al., 2011) and the Randolph Glacier Inventory version 7 (RGI 7.0)


Data files
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For convenience of use, we provide the ice sheet delineations as a shapefile and as a NetCDF file.
All data files use spatial projection EPSG 3031 

1) A shapefile
IMBIE_AIS_Regional_Delineations.cpg
IMBIE_AIS_Regional_Delineations.dbf
IMBIE_AIS_Regional_Delineations.prj
IMBIE_AIS_Regional_Delineations.qmd
IMBIE_AIS_Regional_Delineations.shp
IMBIE_AIS_Regional_Delineations.shx
For each drainage basin, there are two polygons (one for the ice sheet and one for the corresponding islands) and each are assigned to one of the main ice sheet regions (East, West, Peninsula)

2) A netcdf file providing the drainage basin, ice sheet region, and ice sheet/island mask on a 1km x 1km, 5km x 5km grid, and 10km x 10km grid
IMBIE_AIS_Regional_Delineations_1km.nc
IMBIE_AIS_Regional_Delineations_5km.nc
IMBIE_AIS_Regional_Delineations_10km.nc


References
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Rignot, E., J. Mouginot, and B. Scheuchl, 2011. Antarctic Grounding Line Mapping from Differential Satellite Radar Interferometry, Geophysical Research Letters, 38, L10504, DOI: 10.1029/2011GL047109

RGI 7.0 Consortium, 2023. Randolph Glacier Inventory - A Dataset of Global Glacier Outlines, Version 7.0. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi:10.5067/f6jmovy5navz. Online access: https://doi.org/10.5067/f6jmovy5navz https://doi.org/10.5067/f6jmovy5navz
