Update: DMSP SSMIS data processing has been extended through 31 July 2025. See the Earthdata: Status Update on DMSP Data Products for further details.
The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) learned yesterday that the Department of Defense (DoD) will stop processing and delivering the Special Sensor Microwave Imager/Sounder (SSMIS) data no later than 30 June 2025. The SSMIS data are used as input for the following NSIDC DAAC-produced data sets, which will therefore stop processing no later than 30 June 2025:
- Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I (NSIDC-0079)
- DMSP SSM/I Daily Polar Gridded Brightness Temperatures (NSIDC-0001)
- Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures (NSIDC-0080)
- Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations (NSIDC-0081)
- Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent (NISE)
- Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data (NSIDC-0051)
Additionally, the SSMIS data available in the Calibrated Enhanced-Resolution Passive Microwave Daily EASE-Grid 2.0 Brightness Temperature ESDR (NSIDC-0630) data set will end, but the data set will continue to update with data from the AMSR2 sensor.
We are evaluating possible alternative data sources, such as AMSR2, and will communicate further as we know more. We understand that this news may have immediate impacts for you. Please reach out to nsidc@nsidc.org with your questions.