Message Service #2620

03 July 2023

  • Sea ice

Upgrade of the OSI SAF Sea Ice Index

Upgrade of the OSI SAF Sea Ice Index

The OSI SAF Sea Ice Index (SII), OSI-420, has been upgraded to version 2.2. The SII algorithms remain the same, but we change the source of the sea-ice concentration products used as input. Sea Ice Index v2.2 is computed from:

The previous SII-v2.1 was based on v2.0 of Sea Ice Concentration (OSI-450 and OSI-430-b) that were recently deprecated.

Global, Hemispheric, and regional indexes
In the upgraded SII-v2.2, more regional indexes have been included:

  • Global
  • Northern Hemisphere
  • Barents Sea
  • Beaufort Sea
  • Chukchi Sea
  • East Siberian Sea
  • Fram Strait (Greenland Sea)
  • Kara Sea
  • Laptev Sea
  • Svalbard
  • Southern Hemisphere
  • Amundsen-Bellinghausen seas
  • Indian Ocean
  • Ross Sea
  • Weddell Sea
  • West Pacific Ocean

For more information, please visit the product description page: 

and read the Product User Manual:

Interactive plotting
A new interactive plotting tool has been developed at MET Norway. Check this out and make your own personal graphics here

You can select between daily values “Interactive visualization - Daily” or monthly values “Interactive visualization - Monthly” in the left menu list. 

All feedback on the new product and the visualization tool prototype is most welcome!

The production of SII-v2.1 will be switched off at the end of August 2023
Note, that for a shorter period of time, both the SII-v2.2 and the SII-v2.1 will be available in order for users to adjust to the new product. We plan to switch off the v2.1 production at the end of August 2023.

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