Welcome to the NERSC Arctic Sea Ice Observation System.
NERSC has processed daily passive microwave remote sensing data of sea ice from the Arctic since they first became available in 1978 using the NERSC developed NORSEX algorithm.
Info 29 October 2026: Data from the Advanced Microwave Scanning Radiometer 2 (AMSR2) satellite is back online
Update 1 December 2025 (https://nsidc.org/data/nsidc-0802/versions/2): We have now switched to AMSR2 Daily Polar Gridded Brightness Temperatures, Version 2.
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Daily Arctic Sea Ice Map from AMSR2, NERSC
Seasonal Arctic Sea Ice Extent in mill. sq. km.
Seasonal Arctic Sea Ice Area in mill. sq. km.
Data Attribution: The data provided on this website is sourced from the Nansen Environmental and Remote Sensing Center (NERSC) Arctic Sea Ice Observing System (https://iceobs.nersc.no), using the NERSC developed NORSEX Sea Ice algorithm. It uses DMSP SMM/I Brightness temperatures (https://nsidc.org/). It is updated daily and intended for informational purposes only. If you use or reference this data, please attribute it to "NERSC Arctic Sea Ice Observing System" and include a link back to this website (https://iceobs.nersc.no). NERSC makes no warranties regarding the accuracy or completeness of the data.