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Two 'wrongs' can make a 'right': Combining models and data
Ross Bannister, Data Assimilation Research Centre, Univ. of Reading, UK
April 16th 2003

The problem: what is the global state of the atmosphere?

Observation system:
  • - Obs. are non-uniform
  • - Data 'voids'
  • - Obs. have errors
  • - Some obs. are indirect
  • + Obs. are close to reality
Models:
  • - All models are wrong
  • - Models show sensitive dependence on initial conditions
  • - Models have errors
  • + GCMs have a global domain
  • + Models can prodict obs.
The solution: DATA ASSIMILATION