Global Sea Ice Type
Operational Near real time productIce classes are assigned from atmospherically corrected SSMIS brightness temperatures and ASCAT backscatter values, using a Bayesian approach. Both the sea ice edge product and the sea ice type product are classification products differing between different ice classes. Sea ice type differs between First-year ice and Multiyear ice which are defined from target regions of known ice types. The product series is operational since 2005 (version OSI-403-b since 15/09/2015, version OSI-403-c since 30/05/2017).
Identification
Acronym : GBL SITY
Product navigator reference :
EO:EUM:DAT:MULT:OSITYGBN
OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-403-d
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2006
Acronym for EDC (APNM) : OSITYGBN
Characteristics
Processing level : L3
Satellite input : DMSP/SSMIS, Metop/ASCAT and GCOM-W/AMSR-2
Other input : ECMWF forecast for atmospheric correction
Frequency : 1 per day
Central time : 12:00
Timeliness : 5 h
Spatial coverage : global
Spatial sampling : 10 km
File Formats : HL FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Characteristics & methods : Discrimination First year, Multi year.
Multisensor analysis, daily average. Risk mitigation against sensor degradation.
Multisensor analysis, daily average. Risk mitigation against sensor degradation.
Data Access
Main Diffusion Means :
HL FTP server, last 31 days (hosted by MET Norway) : ftp://osisaf.met.no/prod/ice/type/
Archive HL FTP server : ftp://osisaf.met.no/archive/ice/type/
EUMETCast
EDC
Archive HL FTP server : ftp://osisaf.met.no/archive/ice/type/
EUMETCast
EDC
Other means :
SEAICE_GLO_SEAICE_L4_NRT_OBSERVATIONS_011_001 :
https://resources.marine.copernicus.eu/?option=com_csw&view=details&product_id=SEAICE_GLO_SEAICE_L4_NRT_OBSERVATIONS_011_001
Accuracy Requirements
Target accuracy : 100000 km2 monthly std.dev. in difference from running mean
Verification/validation method : Compare multi-year area with 11-days running mean.
Applications and users
Usage : NWP and Ocean/Ice models, operational Met and Sea Ice services.
History
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
Expected date for operational/released :
First date :
Last date :
Comments
New ticket helpdesk
Introducing for the first time Sea Ice Type for the Southern Hemisphere
Using Metop-B and -C, instead of Metop-A and -B (in OSI-402-c)
Switching from NetCDF3 to NetCDF4 as product format
Introducing associated uncertainty fields. The uncertainty field replaces the previous ‘confidence level” variable which will disappear. The confidence level can be reconstructed from the new uncertainty variable.