Information
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Global Sea Ice Concentration interim climate data record, release 3

Development Climate product

The sea-ice concentration Interim Climate Data Record covering the northern and southern hemispheres. Associated to the Climate Data Record OSI-450-a.
L3/L4 daily files, and monthly average files, and monthly sea-ice extent/area indicator.

Identification
Acronym : GBL SICO ICDR R3
OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-430-a (complementing OSI-450-a)
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_2014
Characteristics
Processing level : L3+L4
Satellite input : DMSP/SSMIS from EUMETCast
Other input : NWP outputs (Copernicus C3S ERA5T, with ECMWF operational forecast as backup)
Frequency : 24 h for the L3/L4 daily files. Monthly for the monthly files and indicator.
Central time : 12:00
Timeliness : 16 days
Spatial coverage : Global
Spatial sampling : 25 km
Projection : EASE2
File Formats : HL FTP Server (NetCDF4), EDC (NetCDF4)
Characteristics & methods : Daily averaged fractional ice cover in percentage.
Includes per-grid cell uncertainties.
Fully consistent with OSI-450-a, to ensure homogeneity.
Monthly averaged fractional ice cover are also distributed, as well as monthly sea-ice extent/area indicator.
Data Access
Main Diffusion Means :
Archive HL FTP server : ftp://osisaf.met.no/reprocessed/ice/conc-cont-reproc/v3p0
EDC
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
First date :
Comments
  • Supersedes OSI-430-b.

    Verification/validation methods:

    • Primary Method: Direct comparison against high-quality 0% and 100% SIC reference data (stemming from the ESA CCI projects, Pedersen et al. 2019).
    • Additional: Comparison of SIC to US National Ice Center charts, to document the temporal consistency since 1979 (but limited by the low consistency of ice charts).
    • Additional: Comparison of Monthly Sea Ice Extent and Area time series with those of the US NSIDC Sea Ice Index (absolute level, departure from climatology, trend).
    • Additional : An evaluation of the uncertainties will be performed (at 0 % and 100 %, similar to in Lavergne et al., 2019). The traceability to SI units will be investigated.
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