2026-05-21T16:05:07Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/NSIDC-0105.0052026-03-03T21:04:24Zv0_daacv0_allnasa_nsidc_daac
NSIDC-0105.005Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness TemperaturesBliss, A. C., Anderson, M. & Drobot, S.Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures2022-12-09Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center5false10.5067/TRGWQ0ONTQG5https://nsidc.org/sites/default/files/documents/user-guide/nsidc-0105-userguide-v5.pdfNSIDC-0105Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAInvestigatorMarkAndersonMeteorology/Climatology ProgramDept. of GeosciencesUniversity of NebraskaLincolnNE68588-0340InvestigatorAngelaCBlissacbliss3@huskers.unl.eduInvestigatorSheldonDrobotColorado Center for Astrodynamics ResearchDepartment of Aerospace Engineering431 UCBUniversity of ColoradoBoulderCO80309-0431EARTH SCIENCECRYOSPHERESEA ICESNOW MELT Climatology/Meteorology/AtmosphereArcticClimate ProxyDAACDMSPEOSDISFTPGridded DataNASANIMBUS-7NSIDCPassive Microwave Brightness TemperaturesPolarPolar StereographicPolar Stereo Snow-project Remote SensingSea IceSea Ice PM Other-projectSea Ice Prediction Network-projectSIPN melt-projectSIPN-projectSMMRSMMR and SSM/I-SSMIS-projectsmmr-ssmi-projectSMMR/SSMIS Polar Stereo Snow Melt-projectSnow Melt Onset DatesSSM/ITbsSMMRScanning Multichannel Microwave RadiometerSSM/ISpecial Sensor Microwave/ImagerSSMISSpecial Sensor Microwave Imager/SounderDMSPDefense Meteorological Satellite ProgramDMSP 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-F17Nimbus-7Nimbus-71979-01-012025-12-31complete3090-180180OCEANARCTIC OCEANGEOGRAPHIC REGIONNORTHERN HEMISPHERE25 km25 km1 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/use_copyright.html. For more information on the NASA EOSDIS Data Use Policy, see https://earthdata.nasa.gov/earth-observation-data/data-use-policy.EnglishOR-STATE/COASNASA 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 ColoradoBoulderCO80309-0449USAFTP1.9 MBNetCDFFTPPNGThis data set includes yearly snow melt onset dates over Arctic sea ice derived from Scanning Multichannel Microwave Radiometer (SMMR), Special Sensor Microwave/Imager (SSM/I), and the Special Sensor Microwave Imager/Sounder (SSMIS) brightness temperature measurements. The data are gridded to the 25 km Northern Hemisphere Polar Stereographic projection and available from 1979 through 2025.
This data set also contains value-added statistics for each grid cell, including: mean melt onset date, latest (maximum) melt onset date, earliest (minimum) melt onset date, range of melt onset dates (the difference between maximum and minimum onset dates), and the standard deviation of melt onset dates. One browse image is also provided for each yearly file and statistical field.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/documents/user-guide/nsidc-0105-userguide-v5.pdfSnow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures, Version 5 User GuideGET DATAhttps://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0105_snowmelt_on_seaice_v5/HTTPSUSA/NASACEOS IDN DIFVERSION 9.92022-12-092026-03-03NSIDCVersion SummaryChanges to this version include:
Extended the data record through 2025; and reprocessed the entire data set using a newer version of the sea ice extent masks within the snow melt onset algorithm.
The Advanced Horizontal Range Algorithm (AHRA) has been updated to have a variable start date. The algorithm start date is now defined as the first day following the day of the annual maximum sea ice extent (SIE), making the first possible melt onset date as the day after the sea ice reaches its maximum extent. To derive the sea ice mask and identify maximum annual SIE, the cdr_seaice_conc variable was used as daily sea ice concentrations.NSIDCMinor Version1This update extends the temporal coverage by three years. Data are now provided from 1979 through 2025. The annual melt onset dates are now provided in individual .nc files (one per year) instead of one file that contains all years. The statistical summary data (earliest, latest, range, mean, median, standard deviation, trend) computed for the 1979-2025 data record are now provided in one .nc file separate from the annual melt onset dates. 2025-12-160NSIDCCurrent Version1NSIDCSpatial Reference SystemsEPSG:3411NSIDC Sea Ice Polar Stereographic NorthNSIDCLevel of ServiceComprehensiveNSIDCFull Dataset CitationBliss, A. C., Anderson, M. & Drobot, S. (2022). <i>Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures</i>. (NSIDC-0105, Version 5). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/TRGWQ0ONTQG5">https://doi.org/10.5067/TRGWQ0ONTQG5</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/nsidc0105_snowmelt_on_seaice_v5/