NOAA/NMC/CAC Arctic and Antarctic Monthly Sea Ice Extent, 1973-1990
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 degree latitude x 2.5 degrees longitude grid. The grid boxes were then summed in 1 degree latitude x 10 degrees 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).
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.