Global Sea Ice Emissivity

Operational Near real time product

The sea ice surface emissivity is representative for the near 50 GHz channels used for temperature sounding of the atmosphere using satellite radiometers such as SSMIS and AMSU. The model for computing the emissivities is described in the ATBD. It uses the brightness temperatures at 19v, 37v and 37h measured by the conically scanning SSMIS.

Acronym : GBL SIEM
Product navigator reference :


OSI SAF producer : Danish Meteorological Institute
Identifier : OSI-404-a
Acronym for EDC (APNM) : OSIEMGB
Processing level : L3
Satellite input : DMSP/SSMIS
Other input : None
Frequency : 1 per day
Central time : 12:00
Timeliness : 5 h
Spatial coverage : global
Spatial sampling : 10 km
File Formats : HL FTP Server (NetCDF3), EDC (NetCDF3), EUMETCast (NetCDF3)
Characteristics & methods : Sea ice emissivity at 50GHz, daily average.
Simulated with measured coefficients.
Including uncertainties.
Data Access
Main Diffusion Means : HL FTP server, last 31 days (hosted by MET Norway) :
Archive HL FTP server :
Other means :


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.
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 :
  • Replaced OSI-404 on 09/08/2018. Improvement is the inclusion of uncertainties.

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