Data Set ID:
G00917

NOAA/NMC/CAC Arctic and Antarctic Monthly Sea Ice Extent, 1973-1990, Version 1

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).

This is the most recent version of these data.

Parameter(s):
  • Sea Ice > Ice Extent > ICE EXTENT
  • Sea Ice > Sea Ice Concentration > SEA ICE CONCENTRATION
Data Format(s):
  • ASCII Text
Spatial Coverage:
N: -50, 
N: 90, 
S: -90, 
S: 50, 
E: 180, 
E: 180, 
W: -180
W: -180
Platform(s):AIRCRAFT, GROUND STATIONS, GROUND-BASED OBSERVATIONS, SHIPS
Spatial Resolution:
  • 10 degrees x 1 degree
Sensor(s):VISUAL OBSERVATIONS
Temporal Coverage:
  • 31 January 1973 to 31 August 1990
(updated 1990)
Version(s):V1
Temporal Resolution1 monthMetadata XML:View Metadata Record
Data Contributor(s):Chester Ropelewski

Geographic Coverage

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As a condition of using these data, you must cite the use of this data set using the following citation. 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, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.7265/N5Z60KZ1. [Date Accessed].

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