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R James Purser Manuel S F V de Pondeca David F Parrish and Dezso Divinyi
Istvan Szunyogh Elizabeth A Satterfield Jose A Aravequia Elana J Fertig
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algorithm amplitude AMSU-A analysis ensemble analysis error analysis increment analysis system atmosphere average background error covariance background error standard background error variances balance equation balance operators calculated coefficients control variable covariance matrix data assimilation system dependent background error deviation of background ECMWF EnKF ensemble based ensemble data assimilation ensemble forecasts ensemble Kalman filter ensemble mean ensemble members ensemble spread error standard deviation estimate extra-tropics field Figure Fisher flow dependent background flow-dependent forecast error formulation Gaussian geopotential height geostrophic global grid point hexads HIRLAM horizontal humidity impact implementation initial left panel LETKF linear Lorenc model errors NCEP nonlinear normal mode numerical weather prediction observation error perturbations potential vorticity REDNMC representation right panel Rossby rotational wind scheme shallow water equations shows singular vectors SPBS specific humidity spectral localization spectral space streamfunction surface pressure Szunyogh temperature triads tropics unbalanced variational assimilation variational data assimilation vertical zonal