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Home > Research > EU Projects > ENSEMBLES > Experimental Set up >     
   
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S2D Stream 1 and 2

 
 

 

The proposal for the Stream 2 hindcasts is as follows:

  • Seasonal and annual ensemble integrations
    • 4 start dates per year: 1st of February, May, August and November
    • 7 month hindcasts for every start date, except 14 for those starting in November
    • Hindcast production 1960-2005, using ERA-40 up to August 2002 inclusive and ECMWF operational analyses afterwards
    • 9-member ensembles
  • Multi-annual ensemble integrations (minimum set)
    • One hindcast every 5 years
    • 10 year runs starting on 1st of November 1960, with the next one starting in November 1965 and so on
    • Hindcast production 1960-2005
    • 3-member ensembles
  • Additional integrations (case studies)
    • Co-ordinated experiments to assess predictability at several time scales for specific events, e.g., with and without (observed SSTs) ocean coupling, with and without relaxation in the soil, with and without relaxation to atmospheric analysis in the tropics, etc.
    • Set up as similar to the minimum set as possible to take advantage of the minimum set as control experiment
    • Preliminary selection of cases:
      • European cold winters similar to 2005/06
      • European warm summers similar to 2003
      • Strong ENSO events, e.g. 1997/98
      • Warming trend in the Indian Ocean

The proposal for the Stream 1 hindcasts has been:

  • Seasonal and annual ensemble integrations
    • 2 start dates per year: 1st of May and November
    • 7 month hindcasts for May and 14 for November
    • Hindcast production 1991-2001
    • 9-member ensembles
  • Multi-annual ensemble integrations
    • Two hindcasts started on the first of November 1965 and 1994

 


 

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