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RISA New Hessian Preconditioning Method Applied to Variational Data Assimilation Experiments Using NASA General Circulation Models
Publisher: American Meteorological Society
Abstract: An analysis is provided to show that Courtier's et al. method for estimating the Hessian preconditioning is not applicable to important categories of cases involving nonlinearity. An extension of the method to cases with ...
Sensitivity to Large-Scale Environmental Fields of the Relaxed Arakawa–Schubert Parameterization in the NASA GEOS-1 GCM
Publisher: American Meteorological Society
Abstract: An adjoint sensitivity analysis of the relaxed Arakawa?Schubert scheme in the National Aeronautics and Space Administration GEOS-1 GCM with respect to perturbations in large-scale environmental fields was conducted. The ...
Four-Dimensional Variational Data Assimilation Experiments with a Multilevel Semi-Lagrangian Semi-Implicit General Circulation Model
Publisher: American Meteorological Society
Abstract: Four-dimensional variational data assimilation (VDA) experiments have been carded out using the adiabatic version of the NASA/Goddard Laboratory for Atmospheres semi-Lagrangian semi-implicit (SLSI) multilevel general ...