An investigation of incremental 4D‐Var using non‐tangent linear models

We investigate the convergence of incremental four‐dimensional variational data assimilation (4D‐Var) when an approximation to the tangent linear model is used within the inner loop. Using a semi‐implicit semi‐Lagrangian model of the one‐dimensional shallow water equations, we perform data assimilat...

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Veröffentlicht in:	Quarterly journal of the Royal Meteorological Society 2005-01, Vol.131 (606), p.459-476
Hauptverfasser:	Lawless, A. S., Gratton, S., Nichols, N. K.
Format:	Artikel
Sprache:	eng
Schlagworte:	Earth, ocean, space Exact sciences and technology External geophysics Gauss–Newton Incremental formulation Mathematics Meteorology Tangent linear Variational data assimilation Weather analysis and prediction
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