ECMWF Training course 2010 slide 30 B(qxq)=Var(x b ) R(pxp)=Var(y) K(qxp) gain matrix H(pxq) Jacobian matrix xbxb y xbxb y xbxb y Analysis Solution Model space Observation space FSO Analysis Sensitivity to the Observation or Information Content Cardinali et al 2004 Cardinali 2009
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