Global Sea Ice Emissivity
Development Near real time productGridded sea ice surface emissivity representative for the near 50 GHz channels. Two coefficients, Roughness and Scaling, are calculated from the brightness temperatures at 19v, 37v and 37h, measured by the conically scanning SSMIS, and are used to compute emissivity using an emissivity model with some typical satellite sensor configurations. The product is used for temperature sounding of the atmosphere using satellite radiometers such as SSMIS and AMSU. Users can also compute emissivity corresponding to their specific applications (e.g., polarization and incidence angle). Effective temperature, derived from AMSR2, is also provided.
EO:EUM:DAT:DMSP:SISE50
Simulated with measured coefficients.
Including uncertainties.
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
EUMETSAT Multicast
- Version OSI-404 until 09/08/2018
- Version OSI-404-a since 09/08/2018: improvement is the inclusion of uncertainties.
- Version OSI-404-b to become operational on 04/03/2025: addition of horizontally polarized emissivity and fixing issues such as the missing effective temperature
Whether you’re displaying the product as-is or if you have used it as input data, please use one of the following attribution:
Figures (short): "EUMETSAT OSI SAF OSI-404-b"
Texts (long): “Data source: EUMETSAT OSI SAF, Global Sea Ice Emissivity (2025), OSI-404-b.”
Papers: “EUMETSAT Ocean and Sea Ice Satellite Application Facility, Global Sea Ice Emissivity (2025), OSI-404-b.”
The main updates for the emissivity product (compared to OSI-404-a) are :
Furthermore, the product now offers users more flexibility by providing the coefficients and equations used for emissivity calculation so that they can calculate emissivity for arbitrary satellite zenith angles and polarization according to their needs.
Please note also that OSI SAF products are licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0) by EUMETSAT. See OSI SAF usage policy and acknowledgement