Monthly average polar sea-ice concentration 1978 through 1991

Online link https://geo-nsdi.er.usgs.gov/metadata/digital-data/27/metadata.faq.html
Description This data set represents the results of calculations carried out on sea-ice-concentration data from the SMMR and SSM/I instruments. The original data were obtained from the National Snow and Ice Data Center (NSIDC). The data set also contains the source
Originators Schweitzer, Peter N.
Publication U.S. Geological Survey Digital Data Series DDS-27

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States or counties

Ice-concentration grid cell

Any of the one-byte data elements in the sea-ice- concentration files

Label Definition
Ice-concentration grid cell value The proportion of the ocean area represented by the grid cell that is covered with sea ice.

ETOPO5 grid cell

Any of the two-byte data elements in the files etopo5.n and etopo5.s

Label Definition
ETOPO5 grid cell value Height of the land surface or depth of the sea floor, relative to mean sea level.