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Sea-Ice Emissivity

Operational Near real time product

Gridded sea ice surface emissivity of the sea ice surface at 50 GHz. Derived from 18 and 36 GHz observations based on empirical relationships obtained from simulated data. Extends the Sea-Ice Emissivity series OSI-404 started in 2018.

Identification
Acronym : GBL SIEM
EUMETSAT collection ref. :

EO:EUM:DAT:1185

OSI SAF producer : Danish Meteorological Institute
Identifier : OSI-404-d
Id for archive (APNM) : OSIEMGB
Licence/Attribution/Citation : CC BY 4.0 See below
Characteristics
Processing level : L3
Satellite input : GOSAT-GW/AMSR3
Other input : None
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 : Sea ice emissivity at 50GHz, daily average.
Simulated with measured coefficients.
Including uncertainties.
Data Access

OSI SAF FTP server (last 31 days)

ftp://osisaf.met.no/prod/

Directory: ice/emis/

OSI SAF FTP server (archive)

ftp://osisaf.met.no/archive/

Directory: ice/emis/

OSI SAF Thredds

https://thredds.met.no/thredds/catalog/osisaf/osisaf.html

https://thredds.met.no/thredds/catalog/osisaf/osisaf_seaiceemis.html

EUMETSAT Multicast

EUMETCast

EUMETSAT Archive

EUMETSAT Data Centre

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Accuracy Requirements
Target accuracy : 5 %
Verification/validation method : Compare with RTM simulations using NWP
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 FTP server since :
First date :
Full series temporal coverage : 2018-onwards
Detailed history :
  • Version OSI-404 until 09/08/2018
  • Version OSI-404-a from 09/08/2018 to 04/03/2025: improvement is the inclusion of uncertainties.
  • Version OSI-404-b from 04/03/2025 to 31/08/2026: addition of horizontally polarized emissivity and fixing issues such as the missing effective temperature
  • Version OSI-404-d from 01/09/2026: with only AMSR3 as input
Licence/Attribution/Citation
Licence : CC BY 4.0
Attribution : You must include attribution to EUMETSAT OSI SAF
Recommended citation : EUMETSAT OSI SAF, Sea Ice Emissivity (2025), OSI-404-d
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