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

Data Contributors ROPELEWSKI, CHESTER F. Parameters SEA ICE > ICE EXTENT SEA ICE > 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

The following example shows how to cite the use of this data set in a publication. For more information, see our Use and Copyright Web page.

Ropelewski, C. F. 1983, updated 1990. NOAA/NMC/CAC Arctic and Antarctic Monthly Sea Ice Extent, 1973-1990. [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5Z60KZ1.

See Also

• Access to NMC/CAC sea ice information and data
• Sea Ice Products at NSIDC
• Contact User Services