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interpolation (the first statistical interpolation method). The complexity of the methodologies increased in step with the state-of-the-art computing resources. Although there are now several methods in use, they all share a common use of a statistical combination of observations and short-range forecasts to calculate accurate initial conditions ( Kalnay 2003 ). Currently most state-of-the-art data assimilation systems are based either on the variational or on the ensemble-based approaches, which adopt
interpolation (the first statistical interpolation method). The complexity of the methodologies increased in step with the state-of-the-art computing resources. Although there are now several methods in use, they all share a common use of a statistical combination of observations and short-range forecasts to calculate accurate initial conditions ( Kalnay 2003 ). Currently most state-of-the-art data assimilation systems are based either on the variational or on the ensemble-based approaches, which adopt