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    • Gridded Monthly Sea Ice Extent and Concentration, 1850 Onward, Version 2

    Metadata Updated: February 19, 2026

    Notice: Due to funding limitations, this data set was recently changed to a “Basic” Level of Service. Learn more about what this means for users and how you can share your story here: Level of Service Update for Data Products.

    Observations from historical sources are the basis of this monthly gridded sea ice concentration product that begins in 1850. In 1979, these sources give way to a single source: concentration from satellite passive microwave data. The historical observations come in many forms: ship observations, compilations by naval oceanographers, analyses by national ice services, and others. Monthly sea ice concentration is given in a 1/4 degree latitude by 1/4 degree longitude grid. In addition to the concentration array, for each month a corresponding source array indicates where each of 16 possible sources is used. The file of concentration and source arrays conforms to NetCDF-4 standards.

    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 April 9, 2025
    Metadata Updated Date February 19, 2026

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date April 9, 2025
    Metadata Updated Date February 19, 2026
    Publisher NSIDC
    Maintainer
    Identifier 10.7265/jj4s-tq79
    Data Last Modified 2026-02-17
    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 c53e9335-979e-4517-ab5c-1f32e61e0f2a
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://noaadata.apps.nsidc.org/NOAA/G10010_V2/
    Old Spatial "CARTESIAN",{"WestBoundingCoordinate":-180.0,"NorthBoundingCoordinate":89.9,"EastBoundingCoordinate":180.0,"SouthBoundingCoordinate":30.1}
    Program Code 026:000
    Source Datajson Identifier True
    Source Hash 77156416f9e32c13ab2de631ef282fb5ee7115b5adc4a02acf2ae46030ac8912
    Source Schema Version 1.1
    Spatial

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