2026-07-28T10:50:22Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/NSIDC-0081.0012026-06-18T19:16:15Zcumulusecsretirednasa_nsidc_daac
NSIDC-0081.001Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice ConcentrationsMaslanik, J. & Stroeve, J.Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations1999-01-01Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center1false10.5067/U8C09DWVX9LMhttps://nsidc.org/sites/default/files/nsidc-0081-v001-userguide_1.pdfNSIDC-0081InvestigatorJimMaslanikInvestigatorJulienneStroevestroeve@nsidc.orgNational Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309InvestigatorKennethKnowlesNational Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAInvestigatorWalterNMeierwalt@nsidc.orgBoudlerCO80309USAInvestigatorDonaldJ.CavalieriDonald.J.Cavalieri@nasa.gov1-301-614-59011-301-614-5644NASA/GSFCMail Code: 615GreenbeltMD20771USATechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCECRYOSPHERESEA ICESEA ICE CONCENTRATION Climatology/Meteorology/AtmosphereOceansAntarcticDMSPGridded DataIceIce ConcentrationNear Real-timePassive MicrowavePolarPolar StereographicPolar Stereo Sea Ice-project Remote SensingSea IceSea Ice ConcentrationSea Ice PM Polar Stereo-projectSea Ice Prediction Network-projectSIPN-projectSIPN sea ice-projectSMMRSMMR and SSM/I-SSMIS-projectsmmr-ssmi-projectSMMR/SSMIS Polar Stereo Sea Ice Conc-projectSpecial Sensor Microwave Imager/SounderSSM/ISSMISSSMISDMSP 5D-3/F17Defense Meteorological Satellite Program-F17DMSP 5D-3/F18Defense Meteorological Satellite Program-F182015-01-012023-01-02deprecated-90-39.23-18018030.9890-180180GEOGRAPHIC REGIONSOUTHERN HEMISPHEREGEOGRAPHIC REGIONNORTHERN HEMISPHERECONTINENTANTARCTICAGEOGRAPHIC REGIONARCTICGEOGRAPHIC REGIONPOLAR25 km25 km1 dayThis near-real-time sea ice concentration (NRTSI) data set is created using brightness temperatures from NOAA's Comprehensive Large Array-data Stewardship System (CLASS) in order to provide the product within one to two days following data acquisition. These brightness temperatures do not receive the same level of quality control as the DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures product created at NSIDC.
Additionally, these NRTSI data may be missing swaths and contain erroneous ice over ocean that was missed by the weather filters.These 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/use_copyright.html. For more information on the NASA EOSDIS Data Use Policy, see https://earthdata.nasa.gov/earth-observation-data/data-use-policy. Near-real-time data provide an estimate of conditions based on information and algorithms available at the time the data are collected (typically within 24 hours). They are processed as data become available, and are not reviewed prior to release. Data may be replaced or removed without notice, and generally will not be reprocessed to correct or remove erroneous data, or to fill in missing data that may become available.EnglishNASA NSIDC DAACNASA 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 ColoradoBoulderCO80309-0449USAHTTPSPNGHTTPSBinaryCavalieri, D. J., P. Gloersen, and W. J. Campbell. 1984. Determination of Sea Ice Parameters with the NIMBUS-7 SMMR. Journal of Geophysical Research 89(D4):5355-5369.
Cavalieri, D. J., C. I. Parkinson, P. Gloersen, and H. J. Zwally. 1997. Arctic and Antarctic Sea Ice Concentrations from Multichannel Passive-Microwave Satellite Data Sets: October 1978 to December 1996, User's Guide. NASA Technical Memorandum 104647. 17 pages.
For a complete list of references, see the References and Related Publications section in the documentation for NSIDC's Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data.This data set is retired and no longer available for download. We recommend using the <a href="https://nsidc.org/data/nsidc-0081">newest version of Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations</a> data set as an alternative. This data set provides a Near-Real-Time (NRT) map of sea ice concentrations for both the Northern and Southern Hemispheres.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/nsidc-0081-v001-userguide_1.pdfNear-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations, Version 1 User GuideVIEW RELATED INFORMATIONhttps://nsidc.org/data/nise1.htmlNear-Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow ExtentVIEW RELATED INFORMATIONhttps://nsidc.org/data/nsidc-0051.htmlSea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave DataVIEW RELATED INFORMATIONhttps://nsidc.org/data/g02135.htmlSea Ice IndexPROJECT HOME PAGEhttps://nsidc.org/data/seaice/Sea Ice Data at NSIDCUSA/NASACEOS IDN DIFVERSION 9.91999-01-012026-06-18NSIDCVersion Summary<ul>
<li>June 2016<br>
Starting on 1 April 2016, sea ice concentration fields are computed using F18 data.</li>
<li>March 2015<br>
New smaller pole hole mask used: SSMIS Pole Hole<br>
New spurious ice masks: NIC Valid Ice Masks</li>
<li>1999<br>
Initial release of this data product. </li>
</ul>NSIDCMinor VersionNSIDCSpatial Reference SystemsEPSG:3411NSIDC Sea Ice Polar Stereographic NorthEPSG:3412NSIDC Sea Ice Polar Stereographic SouthNSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationMaslanik, J. & Stroeve, J. (1999). <i>Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations</i>. (NSIDC-0081, Version 1). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/U8C09DWVX9LM">https://doi.org/10.5067/U8C09DWVX9LM</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue