Bathymetric elevation in meters. Elevations can be assumed to be
relative to mean sea level. However, in some shallow water areas, the
grids include data from sources having a vertical datum other than mean
sea level.

=== Original Data Source ===
Bathymetric Chart of the Arctic Ocean (IBCAO)

The goal of the IBCAO initiative is to develop a digital database
that contains all available bathymetric data north of 64° North, for
use by mapmakers, researchers, institutions, and others whose work
requires a detailed and accurate knowledge of the depth and the
shape of the Arctic seabed.

Citation:
GEBCO Compilation Group (2020) GEBCO 2020 Grid
(doi:10.5285/a29c5465-b138-234d-e053-6c86abc040b9)

Citation URL:
https://www.gebco.net/data_and_products/gridded_bathymetry_data/arctic_ocean/