Previous: Atmospheric model. II: chemistry & transport Next: Assimilation algorithm: application to MSDOL Up: Ext. Abst.

Assimilation algorithm

·       MSDOL uses sequential assimilation: whenever an observation becomes available , it is used to update the predicted value by the model which is run simultaneously;

·       Optimal interpolation is used to combine observations and outputs of the model;

where

	Analysed state vector on the model grid (ozone mixing ratio)
	Predicted state vector
	Observations vector
	Weight of the innovation vector with respect to the prediction of the model
	Forward model providing a direct relation between the predicted state vector and the observations vector
	Covariance matrix of the forecast error
	Covariance matrix of the observation error
	Time evolution operator (model)