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Level 2 PMW sea ice concentration

Development Near real time product

Sea ice concentration product on satellite swath for SSMIS and AMSR-2 instruments. The product is delivered on the native spatial sampling, and with
separate product files for SSMIS and AMSR-2. The product also includes uncertainty estimates and product quality flags.
For both SSMIS and AMSR-2 the low frequency channels (19V, 37H and 37V) are used. For the AMSR-2 also the two high frequency channels (89H and 89V) are used.

Identification
Acronym : L2 SICO
OSI SAF producer : Danish Meteorological Institute
Identifier : OSI-410-a
Characteristics
Processing level : L2
Satellite input : DMSP/SSMIS, GCOM-W1/AMSR-2
Other input : NWP outputs
Frequency : Up to 15 per day for each SSMIS, and 30 per day for AMSR-2
Central time : NA
Timeliness : 3h40
Spatial coverage : Global
Spatial sampling : SSMIS: 25 km, AMSR-2: 10 km
Projection : Swath
File Formats : HL FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Characteristics & methods : L2 fractional ice cover in percentage.
Data Access
Main Diffusion Means : HL FTP server (test) SSMIS : ftp://osisaf.met.no/archive_test/ice/conc_l2_ssmis
HL FTP server (test) AMSR : ftp://osisaf.met.no/archive_test/ice/conc_l2_amsr
Accuracy Requirements
Target accuracy : 10 % for NH-product. 15 % for SH-product
Verification/validation method : Comparison with high resolution manual ice charts (Frequency of availability between once a day and once a week): the performance shall be validated for only the “ice” (100 % ice) and “water” (0 % ice) cases, separately.
Applications and users
Usage : NWP and Ocean/Ice models, operational Met and Sea Ice services.
History
Expected date for operational/released :
Comments
  • The difference in frequency between SSMIS and AMSR-2 is due to the recipient of input data. SSMIS is received per orbit from EUMETCast while AMSR-2is received per half-orbit from JAXA. This means that there are up to75 files per day, one for each orbit and each of the three SSMIS satellites and two for each orbit and the AMSR satellite.

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