Licensed under CC BY 4.0 by EUMETSAT
Global Sea-Ice Type
Operational Near real time productIce classes are assigned from atmospherically corrected SSMIS and AMSR2 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.
Identification
Acronym : GBL SITY
EUMETSAT collection ref. :
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
Id for archive (APNM) : OSITYGBN
Characteristics
Processing level : L3
Satellite input : GCOM-W/AMSR2 and Metop/ASCAT
Other input : ECMWF forecast for atmospheric correction
Temporal sampling : 1 per day
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.
5 h
Spatial coverage : Global
Spatial sampling : 10 km
File Format(s) : 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
OSI SAF FTP server (last 31 days)
ftp://osisaf.met.no/prod/
Directory: ice/type/
OSI SAF FTP server (archive)
ftp://osisaf.met.no/archive/
Directory: ice/type/
OSI SAF Thredds
EUMETSAT Multicast
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 :
First date :
Full series temporal coverage : 2005-onwards
Detailed history :
The product series is operational since 2005 :
- version OSI-403 from 2005 to 15/09/2015
- version OSI-403-b from 15/09/2015 to 30/05/2017
- version OSI-403-c from 30/05/2017 to 03/06/2021
- version OSI-403-d since 03/06/2021
- without DMSP/SSMIS data from 17/07/2025, see service message #3321
- Transitioning from AMSR2 input data to AMSR3 input data in July-August 2026. See dedicated story.
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 Type (2005), OSI-403-d, doi: 10.15770/EUM_SAF_OSI_NRT_2006
References : BibteX entry
Comments
New ticket helpdesk
Introducing for the first time Sea Ice Type for the Southern Hemisphere, see https://osi-saf.eumetsat.int/community/stories/new-osi-saf-southern-hemisphere-sea-ice-type-product.
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.