Licensed under CC BY 4.0 by EUMETSAT
Information
Description
Demo Jupyter notebooks
Documentation
PUM
PSVR

Global Sea-Ice Concentration Interim Climate Data Record (AMSR3), version 3

Operational Climate product

The sea-ice concentration Interim Climate Data Record covering the northern and southern hemispheres using AMSRs. Associated to the Climate Data Record OSI-458. This product provides L3/L4 daily files and has two types of files; the nominal ICDR files with latency of 16 days, and so-called fast-track ICDR files with latency of 2 days, the latest being only available on the FTP server. The fast-track ICDR files for day D are replaced by the nominal ICDR files for the same day D when the nominal files are produced at day D+16.

Identification
EUMETSAT collection ref. :

EO:EUM:DAT:1180

OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-438-a (complementing OSI-458 and OSI-438)
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_0027
Licence/Attribution/Citation : CC BY 4.0 See below
Characteristics
Processing level : L3+L4
Satellite input : AMSR3 (JAXA)
Other input : NWP outputs (Copernicus C3S ERA5T, with ECMWF operational forecast as backup)
Temporal sampling : 24 h for the L3/L4 daily files. Monthly for the monthly files and indicator.
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. 16 days
Spatial coverage : Global
Spatial sampling : 25 km
Projection : EASE2
File Format(s) : NetCDF4
Characteristics & methods : Daily averaged fractional ice cover in percentage.
Includes per-grid cell uncertainties.
Fully consistent with OSI-458, to ensure homogeneity.
Data Access

OSI SAF FTP server

ftp://osisaf.met.no/reprocessed/

Directory: ice/conc-cont-reproc-amsr/v3p0

Thredds

https://thredds.met.no/thredds/catalog/osisaf/osisaf.html

https://thredds.met.no/thredds/catalog/osisaf/osisaf_crepseaiceconc.html

EUMETSAT Archive

EUMETSAT Data Store

EUMETSAT Cloud

EUMETSAT EWC data bucket

TBC (like OSI-458)

Accuracy Requirements
Target accuracy : 8 % (yearly average)
Verification/validation method : Primary Method: Direct comparison against high-quality 0% and 100% SIC reference data (stemming from the ESA CCI projects, Pedersen et al. 2019). See additional methods in the comments at the bottom of this page.
Applications and users
Usage : Climate models, NWP and Ocean/Ice re-analyses, environmental agencies
History
Authorised to be operational / released :
Declared operational / released since :
On FTP server since :
First date :
Full series temporal coverage : 2021-onwards
Detailed history :

[version 3] OSI-438 complements OSI-458 on the period from 01/01/2021 onwards, and became operational from 04/05/2026

[version 3] OSI-438-a complements OSI-458 and OSI-438 on the period from 01/09/2026 onwards

Licence/Attribution/Citation
Licence : CC BY 4.0
Attribution : You must include attribution to EUMETSAT OSI SAF
Recommended citation : EUMETSAT OSI SAF, Global sea ice concentration interim climate data record (AMSR3) (v3.0, 2026), OSI-438-a, doi:10.15770/EUM_SAF_OSI_0027
References : BibteX entry
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