NOAA/NMC/CAC Arctic and Antarctic Monthly Sea Ice Extent, 1973-1990

Data Contributors ROPELEWSKI, CHESTER F. Parameters ICE EXTENT SEA ICE CONCENTRATION Instruments DIGITIZER VISUAL OBSERVATIONS

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Sea ice extent from January 1973 through August 1990 was digitized from weekly operational sea ice charts produced by the Navy/NOAA Joint Ice Center. Charts were digitized by hand using a 1° latitude x 2.5° longitude grid. The grid boxes were then summed in 1° latitude x 10° longitude slices, and the ice covered area computed. The data represent the extent of sea ice at the end of each month, given for 36 10-degree longitudinal sectors in each hemisphere. Data were provided by the NOAA National Weather Service National Meteorological Center (NMC) Climate Analyses Center (CAC).

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Data Citation

Ropelewski, C.F. 1983, updated 1990. NOAA/NMC/CAC Arctic and Antarctic monthly sea ice extent, 1973-1990 . Boulder, CO: National Snow and Ice Data Center. Digital media.

See Also

• Sea Ice Products at NSIDC
• Contact User Services