Global 1/50 degree bathymetry for HYCOM

[Alan Wallcraft]

See https://data.hycom.org/pub/awall/datasets/GLBc0.02/topo/ for:

-rw-r--r--. 1 wallcraf 0375G018  1015922688 Nov 13 01:09 depth_GLBc0.02_37.a
-rw-r--r--. 1 wallcraf 0375G018         440 Nov 13 01:09 depth_GLBc0.02_37.b
-rw-r--r--. 1 wallcraf 0375G018   476495443 Nov 13 01:09 depth_GLBc0.02_37.nc
-rw-r--r--. 1 wallcraf 0375G018  1015922688 Nov 13 01:13 depth_GLBc0.02_38.a
-rw-r--r--. 1 wallcraf 0375G018         440 Nov 13 01:13 depth_GLBc0.02_38.b
-rw-r--r--. 1 wallcraf 0375G018   469043884 Nov 13 01:13 depth_GLBc0.02_38.nc
-rw-r--r--. 1 wallcraf 0375G018    66131659 Nov  9 11:24 GLBc0.02_depth_37_plots_antarctic.tar.gz
-rw-r--r--. 1 wallcraf 0375G018   852812248 Nov  9 11:23 GLBc0.02_depth_37_plots.tar.gz
-rw-r--r--. 1 wallcraf 0375G018         915 Nov 11 16:27 README.GLBc0.02_topo.txt
-rw-r--r--. 1 wallcraf 0375G018 19302531072 Nov  7 14:52 regional.grid.a
-rw-r--r--. 1 wallcraf 0375G018        1065 Nov  7 14:52 regional.grid.b
-rw-r--r--. 1 wallcraf 0375G018     2724283 Nov  9 15:15 Wallcraft_GLBc0.02_setup.pdf

The GLBc0.02 HYCOM region is a global 1/50 degree grid that is Tripole north of 47N, Mercator to 60S, uniform to 86S.  This is double the resolution of the ESPC-D-V02 1/25 degree grid.  The standard bathymetry, with sunk Antacric ice shelves, is depth_GLBc0.02_37 and the CICE bathymetry, with Antacric ice shelves as land, is depth_GLBc0.02_38.  The netcdf versions have one less grid point in j because in HYCOM the last row of a tripole grid is a shifted copy of the previous row.

The tar bundle GLBc0.02_depth_37_plots.tar.gz contains 132 plots each of a 1500 x 1300 tile as PDFs, so you can zoom into the plots to see more detail.  The tar bundle GLBc0.02_depth_37_plots_antarctic.tar.gz contains six plots each of a 3000 x 3200 tile of Antartica as PDFs.

The presentation Wallcraft_GLBc0.02_setup.pdf briefly describes this HYCOM bathymetry and the 2025I2021 modification to GEBCO 2025 used to generate it.

This can be subsetted if you want a compatible regional domain.  Please let us know if there are issues with this bathymetry in your favorite region or regions.

Alan.