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

    Metadata Updated: September 18, 2025

    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).

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date June 18, 2025
    Metadata Updated Date September 18, 2025

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date June 18, 2025
    Metadata Updated Date September 18, 2025
    Publisher NSIDC
    Maintainer
    Identifier 10.7265/N5Z60KZ1
    Data Last Modified 2025-09-11
    Category Earth Science
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id b3530c19-5b9b-4946-8c06-85464a58b432
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://noaadata.apps.nsidc.org/NOAA/G00917/
    Old Spatial "CARTESIAN",{"WestBoundingCoordinate":-180.0,"NorthBoundingCoordinate":-50.0,"EastBoundingCoordinate":180.0,"SouthBoundingCoordinate":-90.0},{"WestBoundingCoordinate":-180.0,"NorthBoundingCoordinate":90.0,"EastBoundingCoordinate":180.0,"SouthBoundingCoordinate":50.0}
    Program Code 026:000
    Source Datajson Identifier True
    Source Hash bc0d79e7a9b3a0793f3fbed1f096b21fac34bed2c8c50112e6ca93d55847d99e
    Source Schema Version 1.1
    Spatial
    Temporal 1973-01-31/1973-01-31

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