Global Sea Ice Concentration (AMSR-2)

Operational Near real time product

Ice concentration is computed from atmospherically corrected AMSR-2 brightness temperatures, using a combination of state-of-the-art algorithms. The product series is operational since 2017. This product is complementary to the SSMIS global sea ice concentration product (OSI-401 series).

Product navigator reference :


OSI SAF producer : Danish Meteorological Institute
Identifier : OSI-408-a
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2023
Citation : See at bottom
Processing level : L3
Satellite input : GCOM-W/AMSR-2
Other input : NWP outputs
Temporal sampling : 1 per day
Central time : 12:00
Timeliness : ? The timeliness is the time elapsing from the sensing time of the last contributing file to the product dissemination to users. It is similar to the latency. 5 h
Spatial coverage : Global
Spatial sampling : 10 km
Projection : polar stereographic
File Formats : HL FTP Server (NetCDF3), EDC (NetCDF3), EUMETCast (NetCDF3)
Characteristics & methods : The High Latitude Level 3 Global AMSR Sea Ice Concentration consists of these major fields:
- Sea ice concentration. Indicates the fraction of a given ocean grid point covered by ice (daily averaged fractional ice cover in percentage).
- Uncertainties. The algorithm uncertainty, the smearing uncertainty and the resulting total uncertainty of each sea ice concentration grid cell.
- Confidence level. Based on the daily standard deviation within each grid cell, provided as a guide.
Data Access

OSI SAF FTP server (last 31 days)

Directory: ice/conc_amsr/

OSI SAF FTP server (archive)

Directory: ice/conc_amsr/

EUMETSAT Multicast

Redistribution by Copernicus Marine Service

Accuracy Requirements
Target accuracy : 10 % for NH-product. 15 % for SH-product
Verification/validation method : Comparison with high spatial resolution manual ice charts (available between twice a week and once a week) : the performance shall be validated for only the “ice” and “water” cases, separately.
Applications and users
Usage : Climate models, NWP and Ocean/Ice models, operational Met and Sea Ice services.
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
First date :
Full series temporal coverage : 2016-onwards
Detailed history :

The product series is operational since 2017.

  • version OSI-408 from 16/03/2017 to 25/04/2023
  • version OSI-408-a since 25/04/2023
Citation : OSI SAF Global Sea Ice Concentration (AMSR-2), OSI-408-a, doi: 10.15770/EUM_SAF_OSI_NRT_2023. EUMETSAT Ocean and Sea Ice Satellite Application Facility. Data extracted from [distributor/distribution mean]: ([extracted period],) ([extracted domains],) accessed [download date]

The content within square brackets "[…]" is to be replaced with whatever distributor, period, domain or download date is relevant to the data being used. The "extracted period" and "extracted domains" are only needed if a subset of the data is being used.
Suggestions for "distributor/distribution mean": OSI SAF FTP server/the EUMETSAT Data Centre/EUMETCast/name and URL of a redistributor...
  • Improved algorithm. Superseds OSI-408.

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