Are the same regions used in the Sea Ice Index and MASIE-NH?

The regions differ slightly between the Sea Ice Index and the Multisensor Analyzed Sea Ice Extent - Northern Hemisphere (MASIE-NH). The two data sets are a source for sea ice extent, but they use different methods and data to estimate this parameter and their intended uses are also different. There are 14 regions used in the Sea Ice Index and 16 regions are used in MASIE-NH. Even if the same regions are referred to in both data sets, they may not necessarily both cover exactly the same area. The Sea Ice Index regions are defined in a file available in binary and text format (Arctic_region_mask_Meier_AnnGlaciol2007.msk and Arctic_region_mask_Meier_AnnGlaciol2007.txt). The MASIE-NH regions are available in geoTIFF, netCDF, or PNG formats and there is a .xls file with the lat/lon vertices of the regions.

Summary comparison of regions

Sea Ice Index RegionsMASIE-NH Regions
Sea of OkhotskSea of Okhotsk
Bering SeaBering Sea
Hudson BayHudson Bay
Gulf of St. LawrenceBaffin Bay/Gulf of St. Lawrence
Baffin BayGreenland Sea
Greenland SeaBarents Sea
Barents SeaKara Sea
Kara SeaLaptev Sea
Laptev SeaEast Siberian Sea
East Siberian SeaChukchi Sea
Chukchi SeaBeaufort Sea
Beaufort SeaCanadian Archipelago
Canadian ArchipelagoCentral Arctic
Central ArcticBaltic Sea
 Yellow Sea
 Cook Inlet