Gridded northern hemisphere NSIDC sea ice region codes (version 2021) at resolutions between 1 and 75 km

Gridded Arctic Marine Regions Codes at resolutions  of 1, 3.125, 6.25, 12.5, 25, 50 & 75 km. The source data are shapefiles from the National Snow and Ice Data Center (NSIDC):

A new regional mask for Arctic sea ice trends and climatologies (J. Scott Stewart and Walter N. Meier, NSIDC) (last accessed June 2024)

Region Code
Region Name

0
Undefined Region

1
Central Arctic

2
Beaufort Sea

3
Chukchi Sea

4
East Siberian Sea

5
Laptev Sea

6
Kara Sea

7
Barents Sea

8
East Greenland Sea

9
Baffin Bay & Labrador Sea

10
Gulf of St. Lawrence

11
Hudson Bay

12
Canadian Archipelago

13
Bering Sea

14
Sea of Okhotsk

15
Sea of Japan

16
Bohai Sea

17
Baltic Sea

18
Gulf of Alaska

Data files contain resolution in meters in the filename (nsidc_arctic_region_mask_2021_ease2_{resolution_m}.nc). The file format is netCDF-4 and the datafile contains one  variable (region_id). The coordinate reference system of the variables is defined by EPSG:6931 (WGS 84 / NSIDC EASE-Grid 2.0 North) and the bounds of the data set are supplied as xc and yc variables in the data file.