2026-07-15T04:35:11Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/NSIDC-0747.0022026-03-16T22:15:47Zv0_daacv0_allnasa_nsidc_daac
NSIDC-0747.002Arctic Sea Ice Seasonal Change and Melt/Freeze Climate Indicators from Satellite DataSteele, M., Bliss, A. C., Peng, G., Meier, W. N. & Dickinson, S.Arctic Sea Ice Seasonal Change and Melt/Freeze Climate Indicators from Satellite Data2026-03-16Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center2false10.5067/2ZJKKYXYLYZ0https://nsidc.org/sites/default/files/documents/user-guide/nsidc-0747-v002-userguide.pdfNSIDC-0747Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCECRYOSPHERESNOW/ICEICE GROWTH/MELT EARTH SCIENCECRYOSPHERESEA ICESEA ICE CONCENTRATION Climatology/Meteorology/AtmosphereSMMR and SSM/I-SSMIS-projectsmmr-ssmi-projectSMMRScanning Multichannel Microwave RadiometerSSM/ISpecial Sensor Microwave/ImagerSSMISSpecial Sensor Microwave Imager/SounderDMSP 5D-2/F11Defense Meteorological Satellite Program-F11DMSP 5D-2/F13Defense Meteorological Satellite Program-F13DMSP 5D-2/F8Defense Meteorological Satellite Program-F8DMSP 5D-3/F17Defense Meteorological Satellite Program-F17DMSP 5D-3/F18Defense Meteorological Satellite Program-F18Nimbus-7Nimbus-71979-03-012024-02-28complete3090-180180GEOGRAPHIC REGIONNORTHERN HEMISPHERE25 km25 k m1 yearThese data are freely, openly, and fully accessible, provided that you are logged into your NASA Earthdata profile (https://urs.earthdata.nasa.gov/).These data are freely, openly, and fully available to use without restrictions, provided that you cite the data according to the recommended citation at https://nsidc.org/about/data-use-and-copyright. For more information on the NASA ESDIS Data Use Guidance, see https://www.earthdata.nasa.gov/engage/open-data-services-software-policies/data-use-guidance.EnglishUWA/APL/PSCNASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199National Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAHTTPSNetCDFNSIDC-0747 contains melt-season indicators that can be used to delineate various stages in the summer melt and freeze-up period of sea ice. The data were primarily derived using Sea Ice Concentration (SIC) observations from the NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration (G02202) and the Snow Melt Onset Dates (NSIDC-0105) from SSM/I-SSMIS Brightness Temperatures products. The main parameters for this data set include the dates of melt onset, early melt onset, and continuous melt onset; dates of early and continuous freeze onset; day of opening (last day SIC is above 80%); day of retreat (last day SIC drops below 15%); day of advance (first day SIC increases above 15%); day of closing (first day SIC increases above 80%); total outer ice-free period; total inner ice-free period; seasonal loss-of-ice period; seasonal gain-of-ice period; and the seasonal ice zone.
These data are available for 1979 through 2024 and are gridded on the NSIDC northern hemisphere polar stereographic grid at 25 km.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/documents/user-guide/nsidc-0747-v002-userguide.pdfArctic Sea Ice Seasonal Change and Melt/Freeze Climate Indicators from Satellite Data, Version 2 User GuideGET DATAhttps://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0747_seaice_melt_indicators_v2/HTTPSCEOS IDN DIFVERSION 9.92026-03-162026-03-16NSIDCVersion SummaryChanges to this version include: Temporal coverage extended through 2024; Input sea ice concentration data are now from NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration, Version 4 (G02202); and the input data for AHRA melt onset dates are now from Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness temperatures, Version 5 (NSIDC-0105).NSIDCMinor VersionNSIDCCurrent Version1NSIDCSpatial Reference SystemsEPSG:3411NSIDC Sea Ice Polar Stereographic NorthNSIDCLevel of ServiceStandardNSIDCFull Dataset CitationSteele, M., Bliss, A. C., Peng, G., Meier, W. N. & Dickinson, S. (2026). <i>Arctic Sea Ice Seasonal Change and Melt/Freeze Climate Indicators from Satellite Data</i>. (NSIDC-0747, Version 2). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/2ZJKKYXYLYZ0">https://doi.org/10.5067/2ZJKKYXYLYZ0</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredfalseNSIDCRelated Servicesapplication/vnd.nasa.cmr.umm+jsonfalseamyygillilandmmt_service_12717S1977897447-NSIDCV0NSIDCV06service2025-04-01T22:12:52.112Zhttps://daacdata.apps.nsidc.org/NSIDCV0_DAAC_Data_HTTPS_File_SystemNOT PROVIDED1HTTPS File SystemQuickly download a few files using a web browser, or access the data through a command-line utility such as WGET.https://nsidc.org/data/user-resources/help-center/programmatic-access-guide-data-daacdataappsVIEW RELATED INFORMATIONProgrammatic Data Access GuidePublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.orgDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service.DEVELOPERORIGINATORPUBLISHERSERVICE PROVIDERNASA National Snow and Ice Data Center Distributed Active Archive CenterNASA NSIDC DAACNASA Distributed Active Archive Center (DAAC) at NSIDChttps://nsidc.org/daacNSIDC DAAC Home Pagehttps://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0747_seaice_melt_indicators_v2/