Delivery of Suomi National Polar-orbiting Partnership (Suomi NPP) satellite data products will cease on November 1, 2026. Data users should transition now to alternative products from NOAA-21 and NOAA-20.Suomi NPP data announcement
Description
This sea ice concentration data set was derived using measurements from the Scanning Multichannel Microwave Radiometer (SMMR) on the Nimbus-7 satellite and from the Special Sensor Microwave/Imager (SSM/I) sensors on the Defense Meteorological Satellite Program's (DMSP) -F8, -F11, and -F13 satellites. Measurements from the Special Sensor Microwave Imager/Sounder (SSMIS) aboard DMSP-F17 are also included. The data set has been generated using the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) Bootstrap Algorithm with daily varying tie-points. Daily (every other day prior to July 1987) and monthly data are available for both the north and south polar regions. Data are gridded on the SSM/I polar stereographic grid (25 x 25 km) and provided in two-byte integer format. Data coverage began on 01 November 1978 and is ongoing through the most current processing, with updated data processed several times annually.
Version Description
The NSIDC DAAC repackaged the data fields provided by GSFC in CF-compliant NetCDF files.
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Comiso, J. (2023). Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/X5LG68MH013O Date Accessed: 2026-08-24
@misc{comiso_2023,
title={Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4},
url={http://nsidc.org/data/NSIDC-0079/versions/4},
DOI={10.5067/X5LG68MH013O},
publisher={NASA National Snow and Ice Data Center Distributed Active Archive Center},
author={Comiso, Josefino},
year={2023},
}
Comiso, J. (2023). Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/X5LG68MH013O Date Accessed: 2026-08-24
Comiso, Josefino. “Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2023, https://doi.org/10.5067/X5LG68MH013O. Date Accessed: 2026-08-24
Clem, Kyle R., Raphael, Marilyn N., Adusumilli, Susheel, Baiman, Rebecca, Banwell, Alison F., Barreira, Sandra, Beadling, Rebecca L., Colwell, Steve, Coy, Lawrence, Datta, Rajashree T., De Laat, Jos, Dunmire, Devon, Fogt, Ryan L., Freeman, Natalie M., Fricker, Helen Amanda, Gardner, Alex S., Johnson, Bryan, Keller, Linda M., Kramarova, Natalya A., Lazzara, Matthew A., Lieser, Jan L., MacFerrin, Michael, MacGilchrist, Graeme A., MacLennan, Michelle L., Massom, Robert A., Mazloff, Matthew R., Mote, Thomas L., Nash, Eric R., Newman, Paul A., Norton, Taylor, Petropavlovskikh, Irina, Pitts, Michael, Reid, Phillip, Santee, Michelle L., Scambos, Ted A., Shi, Jia-Rui, Stammerjohn, Sharon, Strahan, Susan E., Thompson, Andrew F., Wille, Jonathan D., Wilson, Earle