The Polar Gridded AVHRR Brightness Temperatures data set uses the same projection and grid as the North Polar SSM/I Grid used by NSIDC for the Arctic SSM/I data. To match the SSM/I grid alignment and cover most of the Arctic, the Pacific and European Grids Map depicted here were used. The Pacific grid covers the Beaufort, Chukchi, and East Siberian Seas while the European grid covers the Barents, Kara, and some of the East Greenland and Laptev Seas.
Both maps are adapted from:
Fetterer et al. 1993. Data set of Arctic AVHRR imagery for the study of leads. Annals of Glaciology. 17:398-404.