Information
Documentation

Global Sea Ice Concentration climate data record (AMSR), release 3

Development Climate product

The sea-ice concentration Climate Data Record covering the northern and southern hemispheres using AMSRs. Companion to OSI-450-a. R2O from ESA CCI (SICCI-25km).
L3/L4 daily files.

Identification
Acronym : AMSR GBL SICO CDR R3
OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-458
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_0015
Characteristics
Processing level : L3+L4
Satellite input : ASMR-E (NSIDC) and AMSR-2 (JAXA)
Other input : NWP outputs (Copernicus C3S ERA5)
Frequency : 24 h
Central time : 12:00
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 uncertainties.
Data Access
Main Diffusion Means :
Archive HL FTP server : ftp://osisaf.met.no/reprocessed/ice/conc_amsr/v3p0
EDC
Accuracy Requirements
Target accuracy : 8 %
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 reanalyses, environmental agencies.
History
First date :
Last date :
Comments
  • New OSI SAF product (Research to Operations from ESA CCI).

    The time period is June 2002 – Oct 2011 + July 2012 – Dec 2020:

    • 01/06/2002 - 03/10/2011 (AMSR-E)
    • 24/07/2012 - 31/12/2020 (AMSR2).

    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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